diff --git a/.eslintrc.yml b/.eslintrc.yml
index 96f28ebb9f..8ed3e207c9 100644
--- a/.eslintrc.yml
+++ b/.eslintrc.yml
@@ -14,6 +14,11 @@ rules:
   strict:
     - error
     - safe
+  # disallow Object.assign
+  no-restricted-properties:
+    - error
+    - object: 'Object'
+      property: 'assign'
 overrides:
   - files:
       - scripts/**/*.js
@@ -31,6 +36,11 @@ overrides:
       ecmaVersion: 2017
     env:
       browser: false
+    rules:
+      no-restricted-properties:
+        - off
+        - object: 'Object'
+          property: 'assign'
   - files:
       - esm-utils.js
     parserOptions:
@@ -79,7 +89,6 @@ overrides:
         # disallow property access of `global.<timer>.*`
         - selector: '*[object.object.name=global][object.property.name=/(Date|(set|clear)(Timeout|Immediate|Interval))/]:expression'
           message: *GH-237
-
   - files:
       - test/**/*.mjs
     parserOptions:
diff --git a/lib/cli/cli.js b/lib/cli/cli.js
index af0e7841d6..59fd2f4af4 100755
--- a/lib/cli/cli.js
+++ b/lib/cli/cli.js
@@ -19,6 +19,7 @@ const {loadOptions, YARGS_PARSER_CONFIG} = require('./options');
 const commands = require('./commands');
 const ansi = require('ansi-colors');
 const {repository, homepage, version, gitter} = require('../../package.json');
+const {cwd} = require('../utils');
 
 /**
  * - Accepts an `Array` of arguments
@@ -31,7 +32,7 @@ exports.main = (argv = process.argv.slice(2)) => {
   debug('entered main with raw args', argv);
   // ensure we can require() from current working directory
   if (typeof module.paths !== 'undefined') {
-    module.paths.push(process.cwd(), path.resolve('node_modules'));
+    module.paths.push(cwd(), path.resolve('node_modules'));
   }
 
   Error.stackTraceLimit = Infinity; // configurable via --stack-trace-limit?
diff --git a/lib/cli/config.js b/lib/cli/config.js
index a1acaeb5b6..4d0ce44a5d 100644
--- a/lib/cli/config.js
+++ b/lib/cli/config.js
@@ -12,6 +12,7 @@ const fs = require('fs');
 const path = require('path');
 const debug = require('debug')('mocha:cli:config');
 const findUp = require('find-up');
+const utils = require('../utils');
 
 /**
  * These are the valid config files, in order of precedence;
@@ -93,7 +94,7 @@ exports.loadConfig = filepath => {
  * @param {string} [cwd] - Current working directory
  * @returns {string|null} Filepath to config, if found
  */
-exports.findConfig = (cwd = process.cwd()) => {
+exports.findConfig = (cwd = utils.cwd()) => {
   const filepath = findUp.sync(exports.CONFIG_FILES, {cwd});
   if (filepath) {
     debug('findConfig: found config file %s', filepath);
diff --git a/lib/mocha.js b/lib/mocha.js
index 20f53cecee..9d3b11a642 100644
--- a/lib/mocha.js
+++ b/lib/mocha.js
@@ -58,7 +58,7 @@ var mochaStates = utils.defineConstants({
  */
 
 if (!process.browser && typeof module.paths !== 'undefined') {
-  var cwd = process.cwd();
+  var cwd = utils.cwd();
   module.paths.push(cwd, path.join(cwd, 'node_modules'));
 }
 
@@ -231,24 +231,24 @@ Mocha.prototype.reporter = function(reporter, reporterOptions) {
         _reporter = require(reporter);
       } catch (err) {
         if (
-          err.code !== 'MODULE_NOT_FOUND' ||
-          err.message.indexOf('Cannot find module') !== -1
+          err.code === 'MODULE_NOT_FOUND' ||
+          err.message.indexOf('Cannot find module') >= 0
         ) {
           // Try to load reporters from a path (absolute or relative)
           try {
-            _reporter = require(path.resolve(process.cwd(), reporter));
+            _reporter = require(path.resolve(utils.cwd(), reporter));
           } catch (_err) {
-            _err.code !== 'MODULE_NOT_FOUND' ||
-            _err.message.indexOf('Cannot find module') !== -1
-              ? console.warn(sQuote(reporter) + ' reporter not found')
-              : console.warn(
+            _err.code === 'MODULE_NOT_FOUND' ||
+            _err.message.indexOf('Cannot find module') >= 0
+              ? utils.warn(sQuote(reporter) + ' reporter not found')
+              : utils.warn(
                   sQuote(reporter) +
                     ' reporter blew up with error:\n' +
                     err.stack
                 );
           }
         } else {
-          console.warn(
+          utils.warn(
             sQuote(reporter) + ' reporter blew up with error:\n' + err.stack
           );
         }
diff --git a/lib/utils.js b/lib/utils.js
index 6ab1277409..4e6b194249 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -637,7 +637,7 @@ exports.stackTraceFilter = function() {
   var slash = path.sep;
   var cwd;
   if (is.node) {
-    cwd = process.cwd() + slash;
+    cwd = exports.cwd() + slash;
   } else {
     cwd = (typeof location === 'undefined'
       ? window.location
@@ -821,3 +821,13 @@ exports.supportsEsModules = function() {
     }
   }
 };
+
+/**
+ * Returns current working directory
+ *
+ * Wrapper around `process.cwd()` for isolation
+ * @private
+ */
+exports.cwd = function cwd() {
+  return process.cwd();
+};
diff --git a/package-lock.json b/package-lock.json
index b53fae5984..30fdd75d0e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -296,46 +296,173 @@
         "@babel/highlight": "^7.0.0"
       }
     },
+    "@babel/core": {
+      "version": "7.9.6",
+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.9.6.tgz",
+      "integrity": "sha512-nD3deLvbsApbHAHttzIssYqgb883yU/d9roe4RZymBCDaZryMJDbptVpEpeQuRh4BJ+SYI8le9YGxKvFEvl1Wg==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.8.3",
+        "@babel/generator": "^7.9.6",
+        "@babel/helper-module-transforms": "^7.9.0",
+        "@babel/helpers": "^7.9.6",
+        "@babel/parser": "^7.9.6",
+        "@babel/template": "^7.8.6",
+        "@babel/traverse": "^7.9.6",
+        "@babel/types": "^7.9.6",
+        "convert-source-map": "^1.7.0",
+        "debug": "^4.1.0",
+        "gensync": "^1.0.0-beta.1",
+        "json5": "^2.1.2",
+        "lodash": "^4.17.13",
+        "resolve": "^1.3.2",
+        "semver": "^5.4.1",
+        "source-map": "^0.5.0"
+      },
+      "dependencies": {
+        "@babel/code-frame": {
+          "version": "7.8.3",
+          "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.8.3.tgz",
+          "integrity": "sha512-a9gxpmdXtZEInkCSHUJDLHZVBgb1QS0jhss4cPP93EW7s+uC5bikET2twEF3KV+7rDblJcmNvTR7VJejqd2C2g==",
+          "dev": true,
+          "requires": {
+            "@babel/highlight": "^7.8.3"
+          }
+        },
+        "@babel/highlight": {
+          "version": "7.9.0",
+          "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.9.0.tgz",
+          "integrity": "sha512-lJZPilxX7Op3Nv/2cvFdnlepPXDxi29wxteT57Q965oc5R9v86ztx0jfxVrTcBk8C2kcPkkDa2Z4T3ZsPPVWsQ==",
+          "dev": true,
+          "requires": {
+            "@babel/helper-validator-identifier": "^7.9.0",
+            "chalk": "^2.0.0",
+            "js-tokens": "^4.0.0"
+          }
+        },
+        "convert-source-map": {
+          "version": "1.7.0",
+          "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-1.7.0.tgz",
+          "integrity": "sha512-4FJkXzKXEDB1snCFZlLP4gpC3JILicCpGbzG9f9G7tGqGCzETQ2hWPrcinA9oU4wtf2biUaEH5065UnMeR33oA==",
+          "dev": true,
+          "requires": {
+            "safe-buffer": "~5.1.1"
+          }
+        },
+        "debug": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
+          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+          "dev": true,
+          "requires": {
+            "ms": "^2.1.1"
+          }
+        }
+      }
+    },
     "@babel/generator": {
-      "version": "7.4.4",
-      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.4.4.tgz",
-      "integrity": "sha512-53UOLK6TVNqKxf7RUh8NE851EHRxOOeVXKbK2bivdb+iziMyk03Sr4eaE9OELCbyZAAafAKPDwF2TPUES5QbxQ==",
+      "version": "7.9.6",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.9.6.tgz",
+      "integrity": "sha512-+htwWKJbH2bL72HRluF8zumBxzuX0ZZUFl3JLNyoUjM/Ho8wnVpPXM6aUz8cfKDqQ/h7zHqKt4xzJteUosckqQ==",
       "dev": true,
       "requires": {
-        "@babel/types": "^7.4.4",
+        "@babel/types": "^7.9.6",
         "jsesc": "^2.5.1",
-        "lodash": "^4.17.11",
-        "source-map": "^0.5.0",
-        "trim-right": "^1.0.1"
+        "lodash": "^4.17.13",
+        "source-map": "^0.5.0"
       }
     },
     "@babel/helper-function-name": {
-      "version": "7.1.0",
-      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.1.0.tgz",
-      "integrity": "sha512-A95XEoCpb3TO+KZzJ4S/5uW5fNe26DjBGqf1o9ucyLyCmi1dXq/B3c8iaWTfBk3VvetUxl16e8tIrd5teOCfGw==",
+      "version": "7.9.5",
+      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.9.5.tgz",
+      "integrity": "sha512-JVcQZeXM59Cd1qanDUxv9fgJpt3NeKUaqBqUEvfmQ+BCOKq2xUgaWZW2hr0dkbyJgezYuplEoh5knmrnS68efw==",
       "dev": true,
       "requires": {
-        "@babel/helper-get-function-arity": "^7.0.0",
-        "@babel/template": "^7.1.0",
-        "@babel/types": "^7.0.0"
+        "@babel/helper-get-function-arity": "^7.8.3",
+        "@babel/template": "^7.8.3",
+        "@babel/types": "^7.9.5"
       }
     },
     "@babel/helper-get-function-arity": {
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.0.0.tgz",
-      "integrity": "sha512-r2DbJeg4svYvt3HOS74U4eWKsUAMRH01Z1ds1zx8KNTPtpTL5JAsdFv8BNyOpVqdFhHkkRDIg5B4AsxmkjAlmQ==",
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.8.3.tgz",
+      "integrity": "sha512-FVDR+Gd9iLjUMY1fzE2SR0IuaJToR4RkCDARVfsBBPSP53GEqSFjD8gNyxg246VUyc/ALRxFaAK8rVG7UT7xRA==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.8.3"
+      }
+    },
+    "@babel/helper-member-expression-to-functions": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/helper-member-expression-to-functions/-/helper-member-expression-to-functions-7.8.3.tgz",
+      "integrity": "sha512-fO4Egq88utkQFjbPrSHGmGLFqmrshs11d46WI+WZDESt7Wu7wN2G2Iu+NMMZJFDOVRHAMIkB5SNh30NtwCA7RA==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.8.3"
+      }
+    },
+    "@babel/helper-module-imports": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/helper-module-imports/-/helper-module-imports-7.8.3.tgz",
+      "integrity": "sha512-R0Bx3jippsbAEtzkpZ/6FIiuzOURPcMjHp+Z6xPe6DtApDJx+w7UYyOLanZqO8+wKR9G10s/FmHXvxaMd9s6Kg==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.8.3"
+      }
+    },
+    "@babel/helper-module-transforms": {
+      "version": "7.9.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-module-transforms/-/helper-module-transforms-7.9.0.tgz",
+      "integrity": "sha512-0FvKyu0gpPfIQ8EkxlrAydOWROdHpBmiCiRwLkUiBGhCUPRRbVD2/tm3sFr/c/GWFrQ/ffutGUAnx7V0FzT2wA==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-module-imports": "^7.8.3",
+        "@babel/helper-replace-supers": "^7.8.6",
+        "@babel/helper-simple-access": "^7.8.3",
+        "@babel/helper-split-export-declaration": "^7.8.3",
+        "@babel/template": "^7.8.6",
+        "@babel/types": "^7.9.0",
+        "lodash": "^4.17.13"
+      }
+    },
+    "@babel/helper-optimise-call-expression": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/helper-optimise-call-expression/-/helper-optimise-call-expression-7.8.3.tgz",
+      "integrity": "sha512-Kag20n86cbO2AvHca6EJsvqAd82gc6VMGule4HwebwMlwkpXuVqrNRj6CkCV2sKxgi9MyAUnZVnZ6lJ1/vKhHQ==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.8.3"
+      }
+    },
+    "@babel/helper-replace-supers": {
+      "version": "7.9.6",
+      "resolved": "https://registry.npmjs.org/@babel/helper-replace-supers/-/helper-replace-supers-7.9.6.tgz",
+      "integrity": "sha512-qX+chbxkbArLyCImk3bWV+jB5gTNU/rsze+JlcF6Nf8tVTigPJSI1o1oBow/9Resa1yehUO9lIipsmu9oG4RzA==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-member-expression-to-functions": "^7.8.3",
+        "@babel/helper-optimise-call-expression": "^7.8.3",
+        "@babel/traverse": "^7.9.6",
+        "@babel/types": "^7.9.6"
+      }
+    },
+    "@babel/helper-simple-access": {
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/helper-simple-access/-/helper-simple-access-7.8.3.tgz",
+      "integrity": "sha512-VNGUDjx5cCWg4vvCTR8qQ7YJYZ+HBjxOgXEl7ounz+4Sn7+LMD3CFrCTEU6/qXKbA2nKg21CwhhBzO0RpRbdCw==",
       "dev": true,
       "requires": {
-        "@babel/types": "^7.0.0"
+        "@babel/template": "^7.8.3",
+        "@babel/types": "^7.8.3"
       }
     },
     "@babel/helper-split-export-declaration": {
-      "version": "7.4.4",
-      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.4.4.tgz",
-      "integrity": "sha512-Ro/XkzLf3JFITkW6b+hNxzZ1n5OQ80NvIUdmHspih1XAhtN3vPTuUFT4eQnela+2MaZ5ulH+iyP513KJrxbN7Q==",
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.8.3.tgz",
+      "integrity": "sha512-3x3yOeyBhW851hroze7ElzdkeRXQYQbFIb7gLK1WQYsw2GWDay5gAJNw1sWJ0VFP6z5J1whqeXH/WCdCjZv6dA==",
       "dev": true,
       "requires": {
-        "@babel/types": "^7.4.4"
+        "@babel/types": "^7.8.3"
       }
     },
     "@babel/helper-validator-identifier": {
@@ -344,6 +471,17 @@
       "integrity": "sha512-/8arLKUFq882w4tWGj9JYzRpAlZgiWUJ+dtteNTDqrRBz9Iguck9Rn3ykuBDoUwh2TO4tSAJlrxDUOXWklJe4g==",
       "dev": true
     },
+    "@babel/helpers": {
+      "version": "7.9.6",
+      "resolved": "https://registry.npmjs.org/@babel/helpers/-/helpers-7.9.6.tgz",
+      "integrity": "sha512-tI4bUbldloLcHWoRUMAj4g1bF313M/o6fBKhIsb3QnGVPwRm9JsNf/gqMkQ7zjqReABiffPV6RWj7hEglID5Iw==",
+      "dev": true,
+      "requires": {
+        "@babel/template": "^7.8.3",
+        "@babel/traverse": "^7.9.6",
+        "@babel/types": "^7.9.6"
+      }
+    },
     "@babel/highlight": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.0.0.tgz",
@@ -362,46 +500,74 @@
       "dev": true
     },
     "@babel/template": {
-      "version": "7.4.4",
-      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.4.4.tgz",
-      "integrity": "sha512-CiGzLN9KgAvgZsnivND7rkA+AeJ9JB0ciPOD4U59GKbQP2iQl+olF1l76kJOupqidozfZ32ghwBEJDhnk9MEcw==",
+      "version": "7.8.6",
+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.8.6.tgz",
+      "integrity": "sha512-zbMsPMy/v0PWFZEhQJ66bqjhH+z0JgMoBWuikXybgG3Gkd/3t5oQ1Rw2WQhnSrsOmsKXnZOx15tkC4qON/+JPg==",
       "dev": true,
       "requires": {
-        "@babel/code-frame": "^7.0.0",
-        "@babel/parser": "^7.4.4",
-        "@babel/types": "^7.4.4"
+        "@babel/code-frame": "^7.8.3",
+        "@babel/parser": "^7.8.6",
+        "@babel/types": "^7.8.6"
       },
       "dependencies": {
-        "@babel/parser": {
-          "version": "7.4.5",
-          "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.4.5.tgz",
-          "integrity": "sha512-9mUqkL1FF5T7f0WDFfAoDdiMVPWsdD1gZYzSnaXsxUCUqzuch/8of9G3VUSNiZmMBoRxT3neyVsqeiL/ZPcjew==",
-          "dev": true
+        "@babel/code-frame": {
+          "version": "7.8.3",
+          "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.8.3.tgz",
+          "integrity": "sha512-a9gxpmdXtZEInkCSHUJDLHZVBgb1QS0jhss4cPP93EW7s+uC5bikET2twEF3KV+7rDblJcmNvTR7VJejqd2C2g==",
+          "dev": true,
+          "requires": {
+            "@babel/highlight": "^7.8.3"
+          }
+        },
+        "@babel/highlight": {
+          "version": "7.9.0",
+          "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.9.0.tgz",
+          "integrity": "sha512-lJZPilxX7Op3Nv/2cvFdnlepPXDxi29wxteT57Q965oc5R9v86ztx0jfxVrTcBk8C2kcPkkDa2Z4T3ZsPPVWsQ==",
+          "dev": true,
+          "requires": {
+            "@babel/helper-validator-identifier": "^7.9.0",
+            "chalk": "^2.0.0",
+            "js-tokens": "^4.0.0"
+          }
         }
       }
     },
     "@babel/traverse": {
-      "version": "7.4.5",
-      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.4.5.tgz",
-      "integrity": "sha512-Vc+qjynwkjRmIFGxy0KYoPj4FdVDxLej89kMHFsWScq999uX+pwcX4v9mWRjW0KcAYTPAuVQl2LKP1wEVLsp+A==",
+      "version": "7.9.6",
+      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.9.6.tgz",
+      "integrity": "sha512-b3rAHSjbxy6VEAvlxM8OV/0X4XrG72zoxme6q1MOoe2vd0bEc+TwayhuC1+Dfgqh1QEG+pj7atQqvUprHIccsg==",
       "dev": true,
       "requires": {
-        "@babel/code-frame": "^7.0.0",
-        "@babel/generator": "^7.4.4",
-        "@babel/helper-function-name": "^7.1.0",
-        "@babel/helper-split-export-declaration": "^7.4.4",
-        "@babel/parser": "^7.4.5",
-        "@babel/types": "^7.4.4",
+        "@babel/code-frame": "^7.8.3",
+        "@babel/generator": "^7.9.6",
+        "@babel/helper-function-name": "^7.9.5",
+        "@babel/helper-split-export-declaration": "^7.8.3",
+        "@babel/parser": "^7.9.6",
+        "@babel/types": "^7.9.6",
         "debug": "^4.1.0",
         "globals": "^11.1.0",
-        "lodash": "^4.17.11"
+        "lodash": "^4.17.13"
       },
       "dependencies": {
-        "@babel/parser": {
-          "version": "7.4.5",
-          "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.4.5.tgz",
-          "integrity": "sha512-9mUqkL1FF5T7f0WDFfAoDdiMVPWsdD1gZYzSnaXsxUCUqzuch/8of9G3VUSNiZmMBoRxT3neyVsqeiL/ZPcjew==",
-          "dev": true
+        "@babel/code-frame": {
+          "version": "7.8.3",
+          "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.8.3.tgz",
+          "integrity": "sha512-a9gxpmdXtZEInkCSHUJDLHZVBgb1QS0jhss4cPP93EW7s+uC5bikET2twEF3KV+7rDblJcmNvTR7VJejqd2C2g==",
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+        },
+        "vfile": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/vfile/-/vfile-4.1.1.tgz",
+          "integrity": "sha512-lRjkpyDGjVlBA7cDQhQ+gNcvB1BGaTHYuSOcY3S7OhDmBtnzX95FhtZZDecSTDm6aajFymyve6S5DN4ZHGezdQ==",
+          "dev": true,
+          "requires": {
+            "@types/unist": "^2.0.0",
+            "is-buffer": "^2.0.0",
+            "replace-ext": "1.0.0",
+            "unist-util-stringify-position": "^2.0.0",
+            "vfile-message": "^2.0.0"
+          }
+        },
+        "vfile-message": {
+          "version": "2.0.4",
+          "resolved": "https://registry.npmjs.org/vfile-message/-/vfile-message-2.0.4.tgz",
+          "integrity": "sha512-DjssxRGkMvifUOJre00juHoP9DPWuzjxKuMDrhNbk2TdaYYBNMStsNhEOt3idrtI12VQYM/1+iM0KOzXi4pxwQ==",
+          "dev": true,
+          "requires": {
+            "@types/unist": "^2.0.0",
+            "unist-util-stringify-position": "^2.0.0"
+          }
+        }
       }
     },
     "union-value": {
@@ -18583,24 +19445,24 @@
       }
     },
     "unist-util-is": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/unist-util-is/-/unist-util-is-2.1.2.tgz",
-      "integrity": "sha512-YkXBK/H9raAmG7KXck+UUpnKiNmUdB+aBGrknfQ4EreE1banuzrKABx3jP6Z5Z3fMSPMQQmeXBlKpCbMwBkxVw==",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/unist-util-is/-/unist-util-is-3.0.0.tgz",
+      "integrity": "sha512-sVZZX3+kspVNmLWBPAB6r+7D9ZgAFPNWm66f7YNb420RlQSbn+n8rG8dGZSkrER7ZIXGQYNm5pqC3v3HopH24A==",
       "dev": true
     },
     "unist-util-remove": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/unist-util-remove/-/unist-util-remove-1.0.1.tgz",
-      "integrity": "sha512-nL+3O0nBB2Oi8ixVzIfJQLtNOMPIFzwoAIKvhDzEL8B15Nq7EY0KBQPYULjNrEmrwYMCkWp5XGTQiAlYZAL/rw==",
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/unist-util-remove/-/unist-util-remove-1.0.3.tgz",
+      "integrity": "sha512-mB6nCHCQK0pQffUAcCVmKgIWzG/AXs/V8qpS8K72tMPtOSCMSjDeMc5yN+Ye8rB0FhcE+JvW++o1xRNc0R+++g==",
       "dev": true,
       "requires": {
-        "unist-util-is": "^2.0.0"
+        "unist-util-is": "^3.0.0"
       }
     },
     "unist-util-remove-position": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/unist-util-remove-position/-/unist-util-remove-position-1.1.2.tgz",
-      "integrity": "sha512-XxoNOBvq1WXRKXxgnSYbtCF76TJrRoe5++pD4cCBsssSiWSnPEktyFrFLE8LTk3JW5mt9hB0Sk5zn4x/JeWY7Q==",
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/unist-util-remove-position/-/unist-util-remove-position-1.1.4.tgz",
+      "integrity": "sha512-tLqd653ArxJIPnKII6LMZwH+mb5q+n/GtXQZo6S6csPRs5zB0u79Yw8ouR3wTw8wxvdJFhpP6Y7jorWdCgLO0A==",
       "dev": true,
       "requires": {
         "unist-util-visit": "^1.1.0"
@@ -18613,21 +19475,21 @@
       "dev": true
     },
     "unist-util-visit": {
-      "version": "1.4.0",
-      "resolved": "https://registry.npmjs.org/unist-util-visit/-/unist-util-visit-1.4.0.tgz",
-      "integrity": "sha512-FiGu34ziNsZA3ZUteZxSFaczIjGmksfSgdKqBfOejrrfzyUy5b7YrlzT1Bcvi+djkYDituJDy2XB7tGTeBieKw==",
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/unist-util-visit/-/unist-util-visit-1.4.1.tgz",
+      "integrity": "sha512-AvGNk7Bb//EmJZyhtRUnNMEpId/AZ5Ph/KUpTI09WHQuDZHKovQ1oEv3mfmKpWKtoMzyMC4GLBm1Zy5k12fjIw==",
       "dev": true,
       "requires": {
         "unist-util-visit-parents": "^2.0.0"
       }
     },
     "unist-util-visit-parents": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/unist-util-visit-parents/-/unist-util-visit-parents-2.0.1.tgz",
-      "integrity": "sha512-6B0UTiMfdWql4cQ03gDTCSns+64Zkfo2OCbK31Ov0uMizEz+CJeAp0cgZVb5Fhmcd7Bct2iRNywejT0orpbqUA==",
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/unist-util-visit-parents/-/unist-util-visit-parents-2.1.2.tgz",
+      "integrity": "sha512-DyN5vD4NE3aSeB+PXYNKxzGsfocxp6asDc2XXE3b0ekO2BaRUpBicbbUygfSvYfUz1IkmjFR1YF7dPklraMZ2g==",
       "dev": true,
       "requires": {
-        "unist-util-is": "^2.1.2"
+        "unist-util-is": "^3.0.0"
       }
     },
     "universalify": {
@@ -18835,13 +19697,90 @@
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
     },
     "util.promisify": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/util.promisify/-/util.promisify-1.0.0.tgz",
-      "integrity": "sha512-i+6qA2MPhvoKLuxnJNpXAGhg7HphQOSUq2LKMZD0m15EiskXUkMvKdF4Uui0WYeCUGea+o2cw/ZuwehtfsrNkA==",
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/util.promisify/-/util.promisify-1.0.1.tgz",
+      "integrity": "sha512-g9JpC/3He3bm38zsLupWryXHoEcS22YHthuPQSJdMy6KNrzIRzWqcsHzD/WUnqe45whVou4VIsPew37DoXWNrA==",
       "dev": true,
       "requires": {
-        "define-properties": "^1.1.2",
-        "object.getownpropertydescriptors": "^2.0.3"
+        "define-properties": "^1.1.3",
+        "es-abstract": "^1.17.2",
+        "has-symbols": "^1.0.1",
+        "object.getownpropertydescriptors": "^2.1.0"
+      },
+      "dependencies": {
+        "es-abstract": {
+          "version": "1.17.5",
+          "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.17.5.tgz",
+          "integrity": "sha512-BR9auzDbySxOcfog0tLECW8l28eRGpDpU3Dm3Hp4q/N+VtLTmyj4EUN088XZWQDW/hzj6sYRDXeOFsaAODKvpg==",
+          "dev": true,
+          "requires": {
+            "es-to-primitive": "^1.2.1",
+            "function-bind": "^1.1.1",
+            "has": "^1.0.3",
+            "has-symbols": "^1.0.1",
+            "is-callable": "^1.1.5",
+            "is-regex": "^1.0.5",
+            "object-inspect": "^1.7.0",
+            "object-keys": "^1.1.1",
+            "object.assign": "^4.1.0",
+            "string.prototype.trimleft": "^2.1.1",
+            "string.prototype.trimright": "^2.1.1"
+          }
+        },
+        "es-to-primitive": {
+          "version": "1.2.1",
+          "resolved": "https://registry.npmjs.org/es-to-primitive/-/es-to-primitive-1.2.1.tgz",
+          "integrity": "sha512-QCOllgZJtaUo9miYBcLChTUaHNjJF3PYs1VidD7AwiEj1kYxKeQTctLAezAOH5ZKRH0g2IgPn6KwB4IT8iRpvA==",
+          "dev": true,
+          "requires": {
+            "is-callable": "^1.1.4",
+            "is-date-object": "^1.0.1",
+            "is-symbol": "^1.0.2"
+          }
+        },
+        "has-symbols": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/has-symbols/-/has-symbols-1.0.1.tgz",
+          "integrity": "sha512-PLcsoqu++dmEIZB+6totNFKq/7Do+Z0u4oT0zKOJNl3lYK6vGwwu2hjHs+68OEZbTjiUE9bgOABXbP/GvrS0Kg==",
+          "dev": true
+        },
+        "is-callable": {
+          "version": "1.1.5",
+          "resolved": "https://registry.npmjs.org/is-callable/-/is-callable-1.1.5.tgz",
+          "integrity": "sha512-ESKv5sMCJB2jnHTWZ3O5itG+O128Hsus4K4Qh1h2/cgn2vbgnLSVqfV46AeJA9D5EeeLa9w81KUXMtn34zhX+Q==",
+          "dev": true
+        },
+        "is-regex": {
+          "version": "1.0.5",
+          "resolved": "https://registry.npmjs.org/is-regex/-/is-regex-1.0.5.tgz",
+          "integrity": "sha512-vlKW17SNq44owv5AQR3Cq0bQPEb8+kF3UKZ2fiZNOWtztYE5i0CzCZxFDwO58qAOWtxdBRVO/V5Qin1wjCqFYQ==",
+          "dev": true,
+          "requires": {
+            "has": "^1.0.3"
+          }
+        },
+        "object-inspect": {
+          "version": "1.7.0",
+          "resolved": "https://registry.npmjs.org/object-inspect/-/object-inspect-1.7.0.tgz",
+          "integrity": "sha512-a7pEHdh1xKIAgTySUGgLMx/xwDZskN1Ud6egYYN3EdRW4ZMPNEDUTF+hwy2LUC+Bl+SyLXANnwz/jyh/qutKUw==",
+          "dev": true
+        },
+        "object-keys": {
+          "version": "1.1.1",
+          "resolved": "https://registry.npmjs.org/object-keys/-/object-keys-1.1.1.tgz",
+          "integrity": "sha512-NuAESUOUMrlIXOfHKzD6bpPu3tYt3xvjNdRIQ+FeT0lNb4K8WR70CaDxhuNguS2XG+GjkyMwOzsN5ZktImfhLA==",
+          "dev": true
+        },
+        "object.getownpropertydescriptors": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/object.getownpropertydescriptors/-/object.getownpropertydescriptors-2.1.0.tgz",
+          "integrity": "sha512-Z53Oah9A3TdLoblT7VKJaTDdXdT+lQO+cNpKVnya5JDe9uLvzu1YyY1yFDFrcxrlRgWrEFH0jJtD/IbuwjcEVg==",
+          "dev": true,
+          "requires": {
+            "define-properties": "^1.1.3",
+            "es-abstract": "^1.17.0-next.1"
+          }
+        }
       }
     },
     "utils-merge": {
@@ -18922,9 +19861,9 @@
       }
     },
     "vfile-location": {
-      "version": "2.0.4",
-      "resolved": "https://registry.npmjs.org/vfile-location/-/vfile-location-2.0.4.tgz",
-      "integrity": "sha512-KRL5uXQPoUKu+NGvQVL4XLORw45W62v4U4gxJ3vRlDfI9QsT4ZN1PNXn/zQpKUulqGDpYuT0XDfp5q9O87/y/w==",
+      "version": "2.0.6",
+      "resolved": "https://registry.npmjs.org/vfile-location/-/vfile-location-2.0.6.tgz",
+      "integrity": "sha512-sSFdyCP3G6Ka0CEmN83A2YCMKIieHx0EDaj5IDP4g1pa5ZJ4FJDvpO0WODLxo4LUX4oe52gmSCK7Jw4SBghqxA==",
       "dev": true
     },
     "vfile-message": {
@@ -19116,9 +20055,9 @@
       "dev": true
     },
     "wipe-node-cache": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/wipe-node-cache/-/wipe-node-cache-2.1.0.tgz",
-      "integrity": "sha512-Vdash0WV9Di/GeYW9FJrAZcPjGK4dO7M/Be/sJybguEgcM7As0uwLyvewZYqdlepoh7Rj4ZJKEdo8uX83PeNIw==",
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/wipe-node-cache/-/wipe-node-cache-2.1.2.tgz",
+      "integrity": "sha512-m7NXa8qSxBGMtdQilOu53ctMaIBXy93FOP04EC1Uf4bpsE+r+adfLKwIMIvGbABsznaSNxK/ErD4xXDyY5og9w==",
       "dev": true
     },
     "wipe-webpack-cache": {
@@ -19239,12 +20178,6 @@
         "async-limiter": "~1.0.0"
       }
     },
-    "x-is-string": {
-      "version": "0.1.0",
-      "resolved": "https://registry.npmjs.org/x-is-string/-/x-is-string-0.1.0.tgz",
-      "integrity": "sha1-R0tQhlrzpJqcRlfwWs0UVFj3fYI=",
-      "dev": true
-    },
     "xdg-basedir": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/xdg-basedir/-/xdg-basedir-3.0.0.tgz",
@@ -19330,6 +20263,11 @@
         "yargs-parser": "^13.1.2"
       },
       "dependencies": {
+        "ansi-regex": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg=="
+        },
         "get-caller-file": {
           "version": "2.0.5",
           "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
@@ -19349,6 +20287,14 @@
             "is-fullwidth-code-point": "^2.0.0",
             "strip-ansi": "^5.1.0"
           }
+        },
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+          "requires": {
+            "ansi-regex": "^4.1.0"
+          }
         }
       }
     },
@@ -19371,6 +20317,11 @@
         "yargs": "^13.3.0"
       },
       "dependencies": {
+        "ansi-regex": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg=="
+        },
         "cliui": {
           "version": "5.0.0",
           "resolved": "https://registry.npmjs.org/cliui/-/cliui-5.0.0.tgz",
@@ -19406,6 +20357,14 @@
             "strip-ansi": "^5.1.0"
           }
         },
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+          "requires": {
+            "ansi-regex": "^4.1.0"
+          }
+        },
         "wrap-ansi": {
           "version": "5.1.0",
           "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
diff --git a/package.json b/package.json
index a3809e9795..a6b23319fa 100644
--- a/package.json
+++ b/package.json
@@ -119,16 +119,16 @@
     "markdown-toc": "^1.2.0",
     "markdownlint-cli": "^0.14.1",
     "nps": "^5.9.12",
-    "nyc": "^14.1.1",
-    "prettier": "^1.17.1",
-    "remark": "^10.0.1",
-    "remark-github": "^7.0.6",
-    "remark-inline-links": "^3.1.2",
-    "rewiremock": "^3.13.7",
-    "rimraf": "^2.6.3",
-    "sinon": "^7.3.2",
-    "strip-ansi": "^5.2.0",
-    "svgo": "^1.2.2",
+    "nyc": "^15.0.0",
+    "prettier": "^1.19.1",
+    "remark": "^11.0.2",
+    "remark-github": "^8.0.0",
+    "remark-inline-links": "^3.1.3",
+    "rewiremock": "^3.14.1",
+    "rimraf": "^3.0.2",
+    "sinon": "^9.0.1",
+    "strip-ansi": "^6.0.0",
+    "svgo": "^1.3.2",
     "through2": "^3.0.1",
     "to-vfile": "^5.0.3",
     "unexpected": "^10.40.2",
diff --git a/test/node-unit/fixtures/wonky-reporter.fixture.js b/test/node-unit/fixtures/wonky-reporter.fixture.js
new file mode 100644
index 0000000000..7ef80c00ac
--- /dev/null
+++ b/test/node-unit/fixtures/wonky-reporter.fixture.js
@@ -0,0 +1 @@
+throw new Error('bad weirdness in this one');
diff --git a/test/node-unit/mocha.spec.js b/test/node-unit/mocha.spec.js
index 456232da75..2b9c99a59a 100644
--- a/test/node-unit/mocha.spec.js
+++ b/test/node-unit/mocha.spec.js
@@ -1,31 +1,63 @@
 'use strict';
 
-const Mocha = require('../../lib/mocha');
-const utils = require('../../lib/utils');
+const path = require('path');
+const rewiremock = require('rewiremock/node');
 const {createSandbox} = require('sinon');
+const {EventEmitter} = require('events');
 
-describe('Mocha', function() {
-  const opts = {reporter: utils.noop}; // no output
-  const dumbFilepath = require.resolve('./fixtures/dumb-module.fixture.js');
-  const dumberFilepath = require.resolve('./fixtures/dumber-module.fixture.js');
+const MODULE_PATH = require.resolve('../../lib/mocha.js');
+const DUMB_FIXTURE_PATH = require.resolve('./fixtures/dumb-module.fixture.js');
+const DUMBER_FIXTURE_PATH = require.resolve(
+  './fixtures/dumber-module.fixture.js'
+);
 
-  let mocha;
+describe('Mocha', function() {
+  let stubs;
+  let opts;
+  let Mocha;
   let sandbox;
 
   beforeEach(function() {
     sandbox = createSandbox();
-    mocha = new Mocha(opts);
-    delete require.cache[dumbFilepath];
-    delete require.cache[dumberFilepath];
+    opts = {reporter: sandbox.stub()};
+
+    stubs = {};
+    stubs.utils = {
+      supportsEsModules: sandbox.stub().returns(false),
+      warn: sandbox.stub(),
+      isString: sandbox.stub(),
+      noop: sandbox.stub(),
+      cwd: sandbox.stub().returns(process.cwd())
+    };
+    stubs.suite = Object.assign(sandbox.createStubInstance(EventEmitter), {
+      slow: sandbox.stub(),
+      timeout: sandbox.stub(),
+      bail: sandbox.stub()
+    });
+    stubs.Suite = sandbox.stub().returns(stubs.suite);
+    stubs.Suite.constants = {};
+
+    Mocha = rewiremock.proxy(MODULE_PATH, r => ({
+      '../../lib/utils': r.with(stubs.utils).callThrough(),
+      '../../lib/suite': stubs.Suite
+    }));
+    delete require.cache[DUMB_FIXTURE_PATH];
+    delete require.cache[DUMBER_FIXTURE_PATH];
   });
 
   afterEach(function() {
-    delete require.cache[dumbFilepath];
-    delete require.cache[dumberFilepath];
+    delete require.cache[DUMB_FIXTURE_PATH];
+    delete require.cache[DUMBER_FIXTURE_PATH];
     sandbox.restore();
   });
 
   describe('instance method', function() {
+    let mocha;
+
+    beforeEach(function() {
+      mocha = new Mocha(opts);
+    });
+
     describe('addFile()', function() {
       it('should add the given file to the files array', function() {
         mocha.addFile('some-file.js');
@@ -40,9 +72,12 @@ describe('Mocha', function() {
     describe('loadFiles()', function() {
       it('should load all files from the files array', function() {
         this.timeout(1000);
-        mocha.files = [dumbFilepath, dumberFilepath];
+        mocha.files = [DUMB_FIXTURE_PATH, DUMBER_FIXTURE_PATH];
         mocha.loadFiles();
-        expect(require.cache, 'to have keys', [dumbFilepath, dumberFilepath]);
+        expect(require.cache, 'to have keys', [
+          DUMB_FIXTURE_PATH,
+          DUMBER_FIXTURE_PATH
+        ]);
       });
 
       it('should execute the optional callback if given', function() {
@@ -54,13 +89,13 @@ describe('Mocha', function() {
 
     describe('unloadFiles()', function() {
       it('should delegate Mocha.unloadFile() for each item in its list of files', function() {
-        mocha.files = [dumbFilepath, dumberFilepath];
+        mocha.files = [DUMB_FIXTURE_PATH, DUMBER_FIXTURE_PATH];
         sandbox.stub(Mocha, 'unloadFile');
         mocha.unloadFiles();
         expect(Mocha.unloadFile, 'to have a call exhaustively satisfying', [
-          dumbFilepath
+          DUMB_FIXTURE_PATH
         ])
-          .and('to have a call exhaustively satisfying', [dumberFilepath])
+          .and('to have a call exhaustively satisfying', [DUMBER_FIXTURE_PATH])
           .and('was called twice');
       });
 
@@ -68,14 +103,96 @@ describe('Mocha', function() {
         expect(mocha.unloadFiles(), 'to be', mocha);
       });
     });
+
+    describe('reporter()', function() {
+      describe('when a reporter exists relative to the cwd', function() {
+        beforeEach(function() {
+          stubs.utils.cwd.returns(
+            path.resolve(__dirname, '..', '..', 'lib', 'reporters')
+          );
+        });
+
+        it('should load from current working directory', function() {
+          expect(function() {
+            mocha.reporter('./spec.js');
+          }, 'not to throw');
+        });
+
+        describe('when the reporter throws upon load', function() {
+          it('should throw "invalid reporter" exception', function() {
+            expect(
+              function() {
+                mocha.reporter(
+                  '../../test/node-unit/fixtures/wonky-reporter.fixture.js'
+                );
+              },
+              'to throw',
+              {
+                code: 'ERR_MOCHA_INVALID_REPORTER'
+              }
+            );
+          });
+
+          it('should warn about the error before throwing', function() {
+            try {
+              mocha.reporter(
+                '../../test/node-unit/fixtures/wonky-reporter.fixture.js'
+              );
+            } catch (ignored) {
+            } finally {
+              expect(stubs.utils.warn, 'to have a call satisfying', [
+                expect.it('to match', /reporter blew up/)
+              ]);
+            }
+          });
+        });
+      });
+
+      describe('when a reporter exists relative to the "mocha" module path', function() {
+        it('should load from module path', function() {
+          expect(function() {
+            mocha.reporter('./reporters/spec');
+          }, 'not to throw');
+        });
+
+        describe('when the reporter throws upon load', function() {
+          it('should throw "invalid reporter" exception', function() {
+            expect(
+              function() {
+                mocha.reporter(
+                  '../../test/node-nit/fixtures/wonky-reporter.fixture.js'
+                );
+              },
+              'to throw',
+              {
+                code: 'ERR_MOCHA_INVALID_REPORTER'
+              }
+            );
+          });
+
+          it('should warn about the error before throwing', function() {
+            try {
+              mocha.reporter(
+                require.resolve('./fixtures/wonky-reporter.fixture.js')
+              );
+            } catch (ignored) {
+            } finally {
+              expect(stubs.utils.warn, 'to have a call satisfying', [
+                expect.it('to match', /reporter blew up/)
+              ]);
+            }
+          });
+        });
+      });
+    });
   });
 
   describe('static method', function() {
     describe('unloadFile()', function() {
       it('should unload a specific file from cache', function() {
-        require(dumbFilepath);
-        Mocha.unloadFile(dumbFilepath);
-        expect(require.cache, 'not to have key', dumbFilepath);
+        require(DUMB_FIXTURE_PATH);
+        Mocha.unloadFile(DUMB_FIXTURE_PATH);
+        expect(require.cache, 'not to have key', DUMB_FIXTURE_PATH);
       });
     });
   });
diff --git a/test/node-unit/utils.spec.js b/test/node-unit/utils.spec.js
new file mode 100644
index 0000000000..c0b6294450
--- /dev/null
+++ b/test/node-unit/utils.spec.js
@@ -0,0 +1,20 @@
+'use strict';
+
+const rewiremock = require('rewiremock/node');
+
+describe('utils', function() {
+  let utils;
+
+  beforeEach(function() {
+    // add deps to be mocked as needed to second parameter
+    utils = rewiremock.proxy('../../lib/utils', {});
+  });
+
+  describe('function', function() {
+    describe('cwd()', function() {
+      it('should return the current working directory', function() {
+        expect(utils.cwd(), 'to be', process.cwd());
+      });
+    });
+  });
+});
diff --git a/test/unit/mocha.spec.js b/test/unit/mocha.spec.js
index 7340cf14c5..96aad6e66c 100644
--- a/test/unit/mocha.spec.js
+++ b/test/unit/mocha.spec.js
@@ -1,15 +1,89 @@
 'use strict';
 
-var utils = require('../../lib/utils');
-var Mocha = require('../../lib/mocha');
 var sinon = require('sinon');
+var EventEmitter = require('events').EventEmitter;
+var Mocha = require('../../lib/mocha');
+var utils = require('../../lib/utils');
 
 describe('Mocha', function() {
-  var opts = {reporter: utils.noop}; // no output
+  /**
+   * Options for `Mocha` constructor
+   */
+  var opts;
+
+  /**
+   * Sinon sandbox
+   * @see https://sinonjs.org/releases/v9.0.2/sandbox/
+   */
   var sandbox;
 
+  /**
+   * Stub `Runner` constructor; returns a stubbed `EventEmitter`
+   */
+  var Runner;
+
+  /**
+   * Stub `Suite` constructor; returns a stubbed `EventEmitter`
+   */
+  var Suite;
+
+  /**
+   * Stub `Suite` instance (root suite in our case)
+   */
+  var suite;
+
+  /**
+   * Stub `Runner` (`EventEmitter`) instance
+   */
+  var runner;
+
+  /**
+   * Stub `Base` reporter constructor
+   */
+  var Base;
+
+  /**
+   * Instance of a hypothetical reporter
+   */
+  var reporterInstance;
+
   beforeEach(function() {
     sandbox = sinon.createSandbox();
+    reporterInstance = {};
+    opts = {reporter: sandbox.stub().returns(reporterInstance)};
+    Base = sandbox.stub().returns({});
+    runner = utils.assign(sandbox.createStubInstance(EventEmitter), {
+      run: sandbox
+        .stub()
+        .callsArgAsync(0)
+        .returnsThis(),
+      globals: sandbox.stub(),
+      grep: sandbox.stub(),
+      dispose: sandbox.stub()
+    });
+    Runner = sandbox.stub().returns(runner);
+    // the Runner constructor is the main export, and constants is a static prop.
+    // we don't need the constants themselves, but the object cannot be undefined
+    Runner.constants = {};
+    suite = utils.assign(sandbox.createStubInstance(EventEmitter), {
+      slow: sandbox.stub(),
+      timeout: sandbox.stub(),
+      bail: sandbox.stub(),
+      dispose: sandbox.stub(),
+      reset: sandbox.stub()
+    });
+    Suite = sandbox.stub().returns(suite);
+    Suite.constants = {};
+
+    sandbox.stub(utils, 'supportsEsModules').returns(false);
+    sandbox.stub(utils, 'warn');
+    sandbox.stub(utils, 'isString');
+    sandbox.stub(utils, 'noop');
+
+    Mocha.Runner = Runner;
+    Mocha.reporters.Base = Mocha.reporters.base = Base;
+    sandbox.stub(Mocha.reporters, 'spec');
+    Mocha.Suite = Suite;
   });
 
   afterEach(function() {
@@ -26,7 +100,7 @@ describe('Mocha', function() {
       expect(new Mocha()._cleanReferencesAfterRun, 'to be', true);
     });
 
-    describe('when "options.timeout" is `undefined`', function() {
+    describe('when `timeout` option is `undefined`', function() {
       it('should not attempt to set timeout', function() {
         // eslint-disable-next-line no-new
         new Mocha({timeout: undefined});
@@ -34,7 +108,7 @@ describe('Mocha', function() {
       });
     });
 
-    describe('when "options.timeout" is `false`', function() {
+    describe('when `timeout` is `false`', function() {
       it('should set a timeout of 0', function() {
         // eslint-disable-next-line no-new
         new Mocha({timeout: false});
@@ -44,8 +118,8 @@ describe('Mocha', function() {
       });
     });
 
-    describe('when "options.global" is provided', function() {
-      it('should pass "options.global" to #global()', function() {
+    describe('when `global` option is provided', function() {
+      it('should configure `global` option', function() {
         // eslint-disable-next-line no-new
         new Mocha({global: ['singular']});
         expect(Mocha.prototype.global, 'to have a call satisfying', [
@@ -55,628 +129,678 @@ describe('Mocha', function() {
     });
   });
 
-  describe('#allowUncaught()', function() {
-    it('should set the allowUncaught option to true', function() {
-      var mocha = new Mocha(opts);
-      mocha.allowUncaught();
-      expect(mocha.options, 'to have property', 'allowUncaught', true);
-    });
-
-    it('should set the allowUncaught option to false', function() {
-      var mocha = new Mocha(opts);
-      mocha.allowUncaught(false);
-      expect(mocha.options, 'to have property', 'allowUncaught', false);
-    });
-
-    it('should be chainable', function() {
-      var mocha = new Mocha(opts);
-      expect(mocha.allowUncaught(), 'to be', mocha);
-    });
-  });
-
-  describe('#asyncOnly()', function() {
-    it('should set the asyncOnly option to true', function() {
-      var mocha = new Mocha(opts);
-      mocha.asyncOnly();
-      expect(mocha.options, 'to have property', 'asyncOnly', true);
-    });
-
-    it('should set the asyncOnly option to false', function() {
-      var mocha = new Mocha(opts);
-      mocha.asyncOnly(false);
-      expect(mocha.options, 'to have property', 'asyncOnly', false);
-    });
-
-    it('should be chainable', function() {
-      var mocha = new Mocha(opts);
-      expect(mocha.asyncOnly(), 'to be', mocha);
-    });
-  });
-
-  describe('#bail()', function() {
-    it('should set the suite._bail to true if there is no arguments', function() {
-      var mocha = new Mocha(opts);
-      mocha.bail();
-      expect(mocha.suite._bail, 'to be', true);
-    });
-
-    it('should set the suite._bail to false', function() {
-      var mocha = new Mocha(opts);
-      mocha.bail(false);
-      expect(mocha.suite._bail, 'to be', false);
-    });
-
-    it('should be chainable', function() {
-      var mocha = new Mocha(opts);
-      expect(mocha.bail(), 'to be', mocha);
-    });
-  });
-
-  describe('#checkLeaks()', function() {
-    it('should set the checkLeaks option to true', function() {
-      var mocha = new Mocha(opts);
-      mocha.checkLeaks();
-      expect(mocha.options, 'to have property', 'checkLeaks', true);
-    });
+  describe('instance method', function() {
+    var mocha;
 
-    it('should set the checkLeaks option to false', function() {
-      var mocha = new Mocha(opts);
-      mocha.checkLeaks(false);
-      expect(mocha.options, 'to have property', 'checkLeaks', false);
+    beforeEach(function() {
+      mocha = new Mocha(opts);
     });
 
-    it('should be chainable', function() {
-      var mocha = new Mocha(opts);
-      expect(mocha.checkLeaks(), 'to be', mocha);
-    });
-  });
-
-  describe('#cleanReferencesAfterRun()', function() {
-    it('should set the _cleanReferencesAfterRun attribute', function() {
-      var mocha = new Mocha(opts);
-      mocha.cleanReferencesAfterRun();
-      expect(mocha._cleanReferencesAfterRun, 'to be', true);
-    });
+    describe('allowUncaught()', function() {
+      it('should set the allowUncaught option to true', function() {
+        mocha.allowUncaught();
+        expect(mocha.options, 'to have property', 'allowUncaught', true);
+      });
 
-    it('should set the _cleanReferencesAfterRun attribute to false', function() {
-      var mocha = new Mocha(opts);
-      mocha.cleanReferencesAfterRun(false);
-      expect(mocha._cleanReferencesAfterRun, 'to be', false);
-    });
+      it('should set the allowUncaught option to false', function() {
+        mocha.allowUncaught(false);
+        expect(mocha.options, 'to have property', 'allowUncaught', false);
+      });
 
-    it('should be chainable', function() {
-      var mocha = new Mocha(opts);
-      expect(mocha.cleanReferencesAfterRun(), 'to be', mocha);
+      it('should be chainable', function() {
+        expect(mocha.allowUncaught(), 'to be', mocha);
+      });
     });
-  });
 
-  describe('#color()', function() {
-    it('should set the color option to true', function() {
-      var mocha = new Mocha(opts);
-      mocha.color();
-      expect(mocha.options, 'to have property', 'color', true);
-    });
+    describe('asyncOnly()', function() {
+      it('should set the asyncOnly option to true', function() {
+        mocha.asyncOnly();
+        expect(mocha.options, 'to have property', 'asyncOnly', true);
+      });
 
-    it('should set the color option to false', function() {
-      var mocha = new Mocha(opts);
-      mocha.color(false);
-      expect(mocha.options, 'to have property', 'color', false);
-    });
+      it('should set the asyncOnly option to false', function() {
+        mocha.asyncOnly(false);
+        expect(mocha.options, 'to have property', 'asyncOnly', false);
+      });
 
-    it('should be chainable', function() {
-      var mocha = new Mocha(opts);
-      expect(mocha.color(), 'to be', mocha);
+      it('should be chainable', function() {
+        expect(mocha.asyncOnly(), 'to be', mocha);
+      });
     });
-  });
 
-  describe('#delay()', function() {
-    it('should set the delay option to true', function() {
-      var mocha = new Mocha(opts);
-      mocha.delay();
-      expect(mocha.options, 'to have property', 'delay', true);
-    });
+    describe('bail()', function() {
+      describe('when provided no arguments', function() {
+        it('should set the "bail" flag on the root suite', function() {
+          mocha.bail();
+          expect(suite.bail, 'to have a call satisfying', [true]).and(
+            'was called once'
+          );
+        });
+      });
 
-    it('should be chainable', function() {
-      var mocha = new Mocha(opts);
-      expect(mocha.delay(), 'to be', mocha);
-    });
-  });
+      describe('when provided a falsy argument', function() {
+        it('should unset the "bail" flag on the root suite', function() {
+          mocha.bail(false);
+          expect(suite.bail, 'to have a call satisfying', [false]).and(
+            'was called once'
+          );
+        });
+      });
 
-  describe('#enableTimeouts()', function() {
-    it('should set the suite._enableTimeouts to true if no argument', function() {
-      var mocha = new Mocha(opts);
-      mocha.enableTimeouts();
-      expect(mocha.suite._enableTimeouts, 'to be', true);
+      it('should be chainable', function() {
+        expect(mocha.bail(), 'to be', mocha);
+      });
     });
 
-    it('should be chainable', function() {
-      var mocha = new Mocha(opts);
-      expect(mocha.enableTimeouts(), 'to be', mocha);
+    describe('checkLeaks()', function() {
+      it('should set the checkLeaks option to true', function() {
+        mocha.checkLeaks();
+        expect(mocha.options, 'to have property', 'checkLeaks', true);
+      });
     });
-  });
 
-  describe('#diff()', function() {
-    it('should set the diff option to true', function() {
-      var mocha = new Mocha(opts);
-      mocha.diff();
-      expect(mocha.options, 'to have property', 'diff', true);
-    });
+    describe('cleanReferencesAfterRun()', function() {
+      it('should set the _cleanReferencesAfterRun attribute', function() {
+        mocha.cleanReferencesAfterRun();
+        expect(mocha._cleanReferencesAfterRun, 'to be', true);
+      });
 
-    it('should set the diff option to false', function() {
-      var mocha = new Mocha(opts);
-      mocha.diff(false);
-      expect(mocha.options, 'to have property', 'diff', false);
-    });
+      it('should set the _cleanReferencesAfterRun attribute to false', function() {
+        mocha.cleanReferencesAfterRun(false);
+        expect(mocha._cleanReferencesAfterRun, 'to be', false);
+      });
 
-    it('should be chainable', function() {
-      var mocha = new Mocha(opts);
-      expect(mocha.diff(), 'to be', mocha);
+      it('should be chainable', function() {
+        expect(mocha.cleanReferencesAfterRun(), 'to be', mocha);
+      });
     });
-  });
 
-  describe('#dispose()', function() {
-    it('should dispose the root suite', function() {
-      var mocha = new Mocha(opts);
-      var disposeStub = sandbox.stub(mocha.suite, 'dispose');
-      mocha.dispose();
-      expect(disposeStub, 'was called once');
-    });
+    describe('color()', function() {
+      it('should set the color option to true', function() {
+        mocha.color();
+        expect(mocha.options, 'to have property', 'color', true);
+      });
 
-    it('should dispose previous test runner', function() {
-      var mocha = new Mocha(opts);
-      var runStub = sandbox.stub(Mocha.Runner.prototype, 'run');
-      var disposeStub = sandbox.stub(Mocha.Runner.prototype, 'dispose');
-      mocha.run();
-      runStub.callArg(0);
-      mocha.dispose();
-      expect(disposeStub, 'was called once');
-    });
+      it('should set the color option to false', function() {
+        mocha.color(false);
+        expect(mocha.options, 'to have property', 'color', false);
+      });
 
-    it('should unload the files', function() {
-      var mocha = new Mocha(opts);
-      var unloadFilesStub = sandbox.stub(mocha, 'unloadFiles');
-      mocha.dispose();
-      expect(unloadFilesStub, 'was called once');
+      it('should be chainable', function() {
+        expect(mocha.color(), 'to be', mocha);
+      });
     });
-  });
 
-  describe('#forbidOnly()', function() {
-    it('should set the forbidOnly option to true', function() {
-      var mocha = new Mocha(opts);
-      mocha.forbidOnly();
-      expect(mocha.options, 'to have property', 'forbidOnly', true);
-    });
+    describe('delay()', function() {
+      it('should set the delay option to true', function() {
+        mocha.delay();
+        expect(mocha.options, 'to have property', 'delay', true);
+      });
 
-    it('should set the forbidOnly option to false', function() {
-      var mocha = new Mocha(opts);
-      mocha.forbidOnly(false);
-      expect(mocha.options, 'to have property', 'forbidOnly', false);
+      it('should be chainable', function() {
+        expect(mocha.delay(), 'to be', mocha);
+      });
     });
 
-    it('should be chainable', function() {
-      var mocha = new Mocha(opts);
-      expect(mocha.forbidOnly(), 'to be', mocha);
-    });
-  });
+    describe('diff()', function() {
+      it('should set the diff option to true', function() {
+        mocha.diff();
+        expect(mocha.options, 'to have property', 'diff', true);
+      });
 
-  describe('#forbidPending()', function() {
-    it('should set the forbidPending option to true', function() {
-      var mocha = new Mocha(opts);
-      mocha.forbidPending();
-      expect(mocha.options, 'to have property', 'forbidPending', true);
+      describe('when provided `false` argument', function() {
+        it('should set the diff option to false', function() {
+          mocha.diff(false);
+          expect(mocha.options, 'to have property', 'diff', false);
+        });
+      });
     });
 
-    it('should set the forbidPending option to false', function() {
-      var mocha = new Mocha(opts);
-      mocha.forbidPending(false);
-      expect(mocha.options, 'to have property', 'forbidPending', false);
-    });
+    describe('dispose()', function() {
+      it('should dispose the root suite', function() {
+        mocha.dispose();
+        expect(suite.dispose, 'was called once');
+      });
 
-    it('should be chainable', function() {
-      var mocha = new Mocha(opts);
-      expect(mocha.forbidPending(), 'to be', mocha);
-    });
-  });
+      it('should dispose previous test runner', function() {
+        mocha._previousRunner = runner;
+        mocha.dispose();
+        expect(runner.dispose, 'was called once');
+      });
 
-  describe('#fullTrace()', function() {
-    it('should set the fullTrace option to true', function() {
-      var mocha = new Mocha(opts);
-      mocha.fullTrace();
-      expect(mocha.options, 'to have property', 'fullTrace', true);
+      it('should unload the files', function() {
+        var unloadFilesStub = sandbox.stub(mocha, 'unloadFiles');
+        mocha.dispose();
+        expect(unloadFilesStub, 'was called once');
+      });
     });
 
-    it('should set the fullTrace option to false', function() {
-      var mocha = new Mocha(opts);
-      mocha.fullTrace(false);
-      expect(mocha.options, 'to have property', 'fullTrace', false);
-    });
+    describe('forbidOnly()', function() {
+      it('should set the forbidOnly option to true', function() {
+        mocha.forbidOnly();
+        expect(mocha.options, 'to have property', 'forbidOnly', true);
+      });
 
-    it('should be chainable', function() {
-      var mocha = new Mocha(opts);
-      expect(mocha.fullTrace(), 'to be', mocha);
-    });
-  });
+      it('should set the forbidOnly option to false', function() {
+        mocha.forbidOnly(false);
+        expect(mocha.options, 'to have property', 'forbidOnly', false);
+      });
 
-  describe('#global()', function() {
-    it('should be an empty array initially', function() {
-      var mocha = new Mocha();
-      expect(mocha.options.global, 'to be empty');
+      it('should be chainable', function() {
+        expect(mocha.forbidOnly(), 'to be', mocha);
+      });
     });
 
-    it('should be chainable', function() {
-      var mocha = new Mocha(opts);
-      expect(mocha.global(), 'to be', mocha);
-    });
+    describe('forbidPending()', function() {
+      it('should set the forbidPending option to true', function() {
+        mocha.forbidPending();
+        expect(mocha.options, 'to have property', 'forbidPending', true);
+      });
 
-    describe('when argument is invalid', function() {
-      it('should not modify the whitelist when given empty string', function() {
-        var mocha = new Mocha(opts);
-        mocha.global('');
-        expect(mocha.options.global, 'to be empty');
+      it('should set the forbidPending option to false', function() {
+        mocha.forbidPending(false);
+        expect(mocha.options, 'to have property', 'forbidPending', false);
       });
 
-      it('should not modify the whitelist when given empty array', function() {
-        var mocha = new Mocha(opts);
-        mocha.global([]);
-        expect(mocha.options.global, 'to be empty');
+      it('should be chainable', function() {
+        expect(mocha.forbidPending(), 'to be', mocha);
       });
     });
 
-    describe('when argument is valid', function() {
-      var elem = 'foo';
-      var elem2 = 'bar';
-      var elem3 = 'baz';
-
-      it('should add string to the whitelist', function() {
-        var mocha = new Mocha(opts);
-        mocha.global(elem);
-        expect(mocha.options.global, 'to contain', elem);
-        expect(mocha.options.global, 'to have length', 1);
+    describe('fullTrace()', function() {
+      it('should set the fullTrace option to true', function() {
+        mocha.fullTrace();
+        expect(mocha.options, 'to have property', 'fullTrace', true);
       });
 
-      it('should add contents of string array to the whitelist', function() {
-        var mocha = new Mocha(opts);
-        var elems = [elem, elem2];
-        mocha.global(elems);
-        expect(mocha.options.global, 'to contain', elem, elem2);
-        expect(mocha.options.global, 'to have length', elems.length);
+      it('should set the fullTrace option to false', function() {
+        mocha.fullTrace(false);
+        expect(mocha.options, 'to have property', 'fullTrace', false);
       });
 
-      it('should not have duplicates', function() {
-        var mocha = new Mocha({global: [elem, elem2]});
-        var elems = [elem, elem2, elem3];
-        mocha.global(elems);
-        expect(mocha.options.global, 'to contain', elem, elem2, elem3);
-        expect(mocha.options.global, 'to have length', elems.length);
+      it('should be chainable', function() {
+        expect(mocha.fullTrace(), 'to be', mocha);
       });
     });
-  });
 
-  describe('#growl()', function() {
-    describe('if capable of notifications', function() {
-      it('should set the growl option to true', function() {
-        var mocha = new Mocha(opts);
-        mocha.isGrowlCapable = function forceEnable() {
-          return true;
-        };
-        mocha.growl();
-        expect(mocha.options, 'to have property', 'growl', true);
+    describe('global()', function() {
+      it('should be an empty array initially', function() {
+        expect(mocha.options.global, 'to be empty');
       });
-    });
 
-    describe('if not capable of notifications', function() {
-      it('should set the growl option to false', function() {
-        var mocha = new Mocha(opts);
-        mocha.isGrowlCapable = function forceDisable() {
-          return false;
-        };
-        mocha.growl();
-        expect(mocha.options, 'to have property', 'growl', false);
+      it('should be chainable', function() {
+        expect(mocha.global(), 'to be', mocha);
       });
-    });
 
-    it('should be chainable', function() {
-      var mocha = new Mocha(opts);
-      expect(mocha.growl(), 'to be', mocha);
-    });
-  });
-
-  describe('#hideDiff()', function() {
-    it('should set the diff option to false when param equals true', function() {
-      var mocha = new Mocha(opts);
-      mocha.hideDiff(true);
-      expect(mocha.options, 'to have property', 'diff', false);
-    });
+      describe('when argument is invalid', function() {
+        it('should not modify the whitelist when given empty string', function() {
+          mocha.global('');
+          expect(mocha.options.global, 'to be empty');
+        });
 
-    it('should set the diff option to true when param equals false', function() {
-      var mocha = new Mocha(opts);
-      mocha.hideDiff(false);
-      expect(mocha.options, 'to have property', 'diff', true);
-    });
+        it('should not modify the whitelist when given empty array', function() {
+          mocha.global([]);
+          expect(mocha.options.global, 'to be empty');
+        });
+      });
 
-    it('should set the diff option to true when the param is undefined', function() {
-      var mocha = new Mocha(opts);
-      mocha.hideDiff();
-      expect(mocha.options, 'to have property', 'diff', true);
+      describe('when argument is valid', function() {
+        var elem = 'foo';
+        var elem2 = 'bar';
+        var elem3 = 'baz';
+
+        it('should add string to the whitelist', function() {
+          mocha.global(elem);
+          expect(mocha.options.global, 'to contain', elem);
+          expect(mocha.options.global, 'to have length', 1);
+        });
+
+        it('should add contents of string array to the whitelist', function() {
+          var elems = [elem, elem2];
+          mocha.global(elems);
+          expect(mocha.options.global, 'to contain', elem, elem2);
+          expect(mocha.options.global, 'to have length', elems.length);
+        });
+
+        it('should not have duplicates', function() {
+          var mocha = new Mocha({global: [elem, elem2]});
+          var elems = [elem, elem2, elem3];
+          mocha.global(elems);
+          expect(mocha.options.global, 'to contain', elem, elem2, elem3);
+          expect(mocha.options.global, 'to have length', elems.length);
+        });
+      });
     });
 
-    it('should be chainable', function() {
-      var mocha = new Mocha(opts);
-      expect(mocha.hideDiff(), 'to be', mocha);
-    });
-  });
+    describe('growl()', function() {
+      describe('if capable of notifications', function() {
+        it('should set the growl option to true', function() {
+          mocha.isGrowlCapable = function forceEnable() {
+            return true;
+          };
+          mocha.growl();
+          expect(mocha.options, 'to have property', 'growl', true);
+        });
+      });
 
-  describe('#ignoreLeaks()', function() {
-    it('should set the checkLeaks option to false when param equals true', function() {
-      var mocha = new Mocha(opts);
-      mocha.ignoreLeaks(true);
-      expect(mocha.options, 'to have property', 'checkLeaks', false);
-    });
+      describe('if not capable of notifications', function() {
+        it('should set the growl option to false', function() {
+          mocha.isGrowlCapable = function forceDisable() {
+            return false;
+          };
+          mocha.growl();
+          expect(mocha.options, 'to have property', 'growl', false);
+        });
+      });
 
-    it('should set the checkLeaks option to true when param equals false', function() {
-      var mocha = new Mocha(opts);
-      mocha.ignoreLeaks(false);
-      expect(mocha.options, 'to have property', 'checkLeaks', true);
+      it('should be chainable', function() {
+        expect(mocha.growl(), 'to be', mocha);
+      });
     });
 
-    it('should set the checkLeaks option to true when the param is undefined', function() {
-      var mocha = new Mocha(opts);
-      mocha.ignoreLeaks();
-      expect(mocha.options, 'to have property', 'checkLeaks', true);
-    });
+    describe('inlineDiffs()', function() {
+      it('should set the inlineDiffs option to true', function() {
+        mocha.inlineDiffs();
+        expect(mocha.options, 'to have property', 'inlineDiffs', true);
+      });
 
-    it('should be chainable', function() {
-      var mocha = new Mocha(opts);
-      expect(mocha.ignoreLeaks(), 'to be', mocha);
-    });
-  });
+      it('should set the inlineDiffs option to false', function() {
+        mocha.inlineDiffs(false);
+        expect(mocha.options, 'to have property', 'inlineDiffs', false);
+      });
 
-  describe('#inlineDiffs()', function() {
-    it('should set the inlineDiffs option to true', function() {
-      var mocha = new Mocha(opts);
-      mocha.inlineDiffs();
-      expect(mocha.options, 'to have property', 'inlineDiffs', true);
+      it('should be chainable', function() {
+        expect(mocha.inlineDiffs(), 'to be', mocha);
+      });
     });
 
-    it('should set the inlineDiffs option to false', function() {
-      var mocha = new Mocha(opts);
-      mocha.inlineDiffs(false);
-      expect(mocha.options, 'to have property', 'inlineDiffs', false);
-    });
+    describe('invert()', function() {
+      it('should set the invert option to true', function() {
+        mocha.invert();
+        expect(mocha.options, 'to have property', 'invert', true);
+      });
 
-    it('should be chainable', function() {
-      var mocha = new Mocha(opts);
-      expect(mocha.inlineDiffs(), 'to be', mocha);
+      it('should be chainable', function() {
+        expect(mocha.invert(), 'to be', mocha);
+      });
     });
-  });
 
-  describe('#invert()', function() {
-    it('should set the invert option to true', function() {
-      var mocha = new Mocha(opts);
-      mocha.invert();
-      expect(mocha.options, 'to have property', 'invert', true);
-    });
+    describe('noHighlighting()', function() {
+      // :NOTE: Browser-only option...
+      it('should set the noHighlighting option to true', function() {
+        mocha.noHighlighting();
+        expect(mocha.options, 'to have property', 'noHighlighting', true);
+      });
 
-    it('should be chainable', function() {
-      var mocha = new Mocha(opts);
-      expect(mocha.invert(), 'to be', mocha);
+      it('should be chainable', function() {
+        expect(mocha.noHighlighting(), 'to be', mocha);
+      });
     });
-  });
 
-  describe('#noHighlighting()', function() {
-    // :NOTE: Browser-only option...
-    it('should set the noHighlighting option to true', function() {
-      var mocha = new Mocha(opts);
-      mocha.noHighlighting();
-      expect(mocha.options, 'to have property', 'noHighlighting', true);
-    });
+    describe('reporter()', function() {
+      it('should throw reporter error if an invalid reporter is given', function() {
+        expect(
+          function() {
+            mocha.reporter('invalidReporter');
+          },
+          'to throw',
+          {
+            message: "invalid reporter 'invalidReporter'",
+            code: 'ERR_MOCHA_INVALID_REPORTER',
+            reporter: 'invalidReporter'
+          }
+        );
+      });
 
-    it('should be chainable', function() {
-      var mocha = new Mocha(opts);
-      expect(mocha.noHighlighting(), 'to be', mocha);
-    });
-  });
+      it('should be chainable', function() {
+        expect(mocha.reporter(), 'to be', mocha);
+      });
 
-  describe('#reporter()', function() {
-    it('should throw reporter error if an invalid reporter is given', function() {
-      var updatedOpts = {reporter: 'invalidReporter', reporterOptions: {}};
-      var throwError = function() {
-        // eslint-disable-next-line no-new
-        new Mocha(updatedOpts);
-      };
-      expect(throwError, 'to throw', {
-        message: "invalid reporter 'invalidReporter'",
-        code: 'ERR_MOCHA_INVALID_REPORTER',
-        reporter: 'invalidReporter'
+      it('should keep reporterOption on options', function() {
+        var mocha = new Mocha({
+          reporter: 'spec',
+          reporterOption: {
+            foo: 'bar'
+          }
+        });
+        expect(mocha.options.reporterOption, 'to have property', 'foo', 'bar');
+        // To support the legacy property name that can be used by reporters
+        expect(mocha.options.reporterOptions, 'to have property', 'foo', 'bar');
       });
-    });
 
-    it('should be chainable', function() {
-      var mocha = new Mocha(opts);
-      expect(mocha.reporter(), 'to be', mocha);
-    });
+      it('should support legacy reporterOptions', function() {
+        var mocha = new Mocha({
+          reporter: 'spec',
+          reporterOptions: {
+            foo: 'bar'
+          }
+        });
+        expect(mocha.options.reporterOption, 'to have property', 'foo', 'bar');
+        // To support the legacy property name that can be used by reporters
+        expect(mocha.options.reporterOptions, 'to have property', 'foo', 'bar');
+      });
 
-    it('should keep reporterOption on options', function() {
-      var mocha = new Mocha({
-        reporter: 'spec',
-        reporterOption: {
-          foo: 'bar'
-        }
+      describe('when a reporter does not exist', function() {
+        it('should throw an "invalid reporter" exception', function() {
+          expect(
+            function() {
+              mocha.reporter('no such thing');
+            },
+            'to throw',
+            {code: 'ERR_MOCHA_INVALID_REPORTER'}
+          );
+        });
       });
-      expect(mocha.options.reporterOption, 'to have property', 'foo', 'bar');
-      // To support the legacy property name that can be used by reporters
-      expect(mocha.options.reporterOptions, 'to have property', 'foo', 'bar');
     });
 
-    it('should support legacy reporterOptions', function() {
-      var mocha = new Mocha({
-        reporter: 'spec',
-        reporterOptions: {
-          foo: 'bar'
-        }
+    describe('run()', function() {
+      describe('when files have been added to the Mocha instance', function() {
+        beforeEach(function() {
+          sandbox.stub(mocha, 'loadFiles');
+          mocha.addFile('some-file.js');
+        });
+
+        describe('when Mocha is set to eagerly load files', function() {
+          it('should eagerly load files', function(done) {
+            mocha.run(function() {
+              expect(mocha.loadFiles, 'was called once');
+              done();
+            });
+          });
+        });
+
+        describe('when Mocha is set to lazily load files', function() {
+          beforeEach(function() {
+            mocha.loadAsync = true;
+          });
+
+          it('should not eagerly load files', function(done) {
+            mocha.run(function() {
+              expect(mocha.loadFiles, 'was not called');
+              done();
+            });
+          });
+        });
       });
-      expect(mocha.options.reporterOption, 'to have property', 'foo', 'bar');
-      // To support the legacy property name that can be used by reporters
-      expect(mocha.options.reporterOptions, 'to have property', 'foo', 'bar');
-    });
-  });
 
-  describe('#run(fn)', function() {
-    it('should execute the callback when complete', function(done) {
-      var mocha = new Mocha(opts);
-      sandbox.stub(Mocha.Runner.prototype, 'run').callsArg(0);
-      mocha.run(done);
-    });
+      describe('Runner initialization', function() {
+        it('should instantiate a Runner', function(done) {
+          mocha.run(function() {
+            expect(Runner, 'to have a call satisfying', {
+              calledWithNew: true,
+              args: [
+                mocha.suite,
+                {
+                  delay: mocha.options.delay,
+                  cleanReferencesAfterRun: mocha.options.cleanReferencesAfterRun
+                }
+              ]
+            }).and('was called once');
+            done();
+          });
+        });
+
+        describe('when "grep" option is present', function() {
+          beforeEach(function() {
+            mocha.options.grep = /foo/;
+            mocha.options.invert = false;
+          });
+
+          it('should configure "grep"', function(done) {
+            mocha.run(function() {
+              expect(runner.grep, 'to have a call satisfying', [
+                mocha.options.grep,
+                mocha.options.invert
+              ]).and('was called once');
+              done();
+            });
+          });
+        });
+
+        describe('when "global" option is present', function() {
+          beforeEach(function() {
+            mocha.options.global = ['foo', 'bar'];
+          });
+
+          it('should configure global vars', function(done) {
+            mocha.run(function() {
+              expect(runner.globals, 'to have a call satisfying', [
+                mocha.options.global
+              ]).and('was called once');
+              done();
+            });
+          });
+        });
+      });
 
-    it('should not raise errors if callback was not provided', function() {
-      sandbox.stub(Mocha.Runner.prototype, 'run');
-      var mocha = new Mocha(opts);
-      expect(function() {
-        mocha.run();
-      }, 'not to throw');
-    });
+      describe('when "growl" option is present', function() {
+        beforeEach(function() {
+          mocha.options.growl = true;
+          sandbox.stub(Mocha.prototype, '_growl').returnsThis();
+        });
+
+        it('should initialize growl support', function(done) {
+          mocha.run(function() {
+            expect(mocha._growl, 'to have a call satisfying', [runner]);
+            done();
+          });
+        });
+      });
 
-    it('should catch the `start` event if no tests are provided', function(done) {
-      var mocha = new Mocha(opts);
-      mocha.run().on('start', done);
-    });
+      describe('Base reporter initialization', function() {
+        beforeEach(function() {
+          mocha.options.inlineDiffs = 'some value';
+          mocha.options.diff = false;
+        });
+
+        describe('when "color" options is set', function() {
+          beforeEach(function() {
+            mocha.options.color = 'truthy';
+          });
+
+          it('should configure the Base reporter', function(done) {
+            mocha.run(function() {
+              expect(Base, 'to exhaustively satisfy', {
+                inlineDiffs: 'some value',
+                hideDiff: true,
+                useColors: 'truthy'
+              });
+              done();
+            });
+          });
+        });
+
+        it('should configure the Base reporter', function(done) {
+          mocha.run(function() {
+            expect(Base, 'to exhaustively satisfy', {
+              inlineDiffs: 'some value',
+              hideDiff: true
+            });
+            done();
+          });
+        });
+      });
 
-    it('should catch the `end` event if no tests are provided', function(done) {
-      var mocha = new Mocha(opts);
-      mocha.run().on('end', done);
-    });
+      it('should instantiate a reporter', function(done) {
+        mocha.run(function() {
+          expect(opts.reporter, 'to have a call satisfying', {
+            calledWithNew: true,
+            args: [runner, mocha.options]
+          }).and('was called once');
+          done();
+        });
+      });
 
-    it('should throw if a run is in progress', function() {
-      var mocha = new Mocha(opts);
-      var runStub = sandbox.stub(Mocha.Runner.prototype, 'run');
-      mocha.run();
-      expect(
-        function() {
-          mocha.run();
-        },
-        'to throw',
-        {
-          message:
-            'Mocha instance is currently running tests, cannot start a next test run until this one is done',
-          code: 'ERR_MOCHA_INSTANCE_ALREADY_RUNNING',
-          instance: mocha
-        }
-      );
-      expect(runStub, 'was called once');
-    });
+      // TODO: figure out how to stub the stats collector
+      it('should initialize the stats collector');
 
-    it('should throw the instance is already disposed', function() {
-      var mocha = new Mocha(opts);
-      var runStub = sandbox.stub(Mocha.Runner.prototype, 'run');
-      mocha.dispose();
-      expect(
-        function() {
-          mocha.run();
-        },
-        'to throw',
-        {
-          message:
-            'Mocha instance is already disposed, cannot start a new test run. Please create a new mocha instance. Be sure to set disable `cleanReferencesAfterRun` when you want to reuse the same mocha instance for multiple test runs.',
-          code: 'ERR_MOCHA_INSTANCE_ALREADY_DISPOSED',
-          cleanReferencesAfterRun: true,
-          instance: mocha
-        }
-      );
-      expect(runStub, 'was called times', 0);
-    });
+      describe('when a reporter instance has a "done" method', function() {
+        beforeEach(function() {
+          reporterInstance.done = sandbox.stub().callsArgAsync(1);
+        });
 
-    it('should throw if a run for a second time', function() {
-      var mocha = new Mocha(opts);
-      var runStub = sandbox.stub(Mocha.Runner.prototype, 'run');
-      mocha.run();
-      runStub.callArg(0);
-      expect(
-        function() {
-          mocha.run();
-        },
-        'to throw',
-        {
-          message:
-            'Mocha instance is already disposed, cannot start a new test run. Please create a new mocha instance. Be sure to set disable `cleanReferencesAfterRun` when you want to reuse the same mocha instance for multiple test runs.',
-          code: 'ERR_MOCHA_INSTANCE_ALREADY_DISPOSED',
-          instance: mocha
-        }
-      );
-      expect(runStub, 'was called once');
-    });
+        it('should call the reporter "done" method', function(done) {
+          mocha.run(function() {
+            expect(reporterInstance.done, 'was called once');
+            done();
+          });
+        });
+      });
 
-    it('should allow multiple runs if `cleanReferencesAfterRun` is disabled', function() {
-      var mocha = new Mocha(opts);
-      var runStub = sandbox.stub(Mocha.Runner.prototype, 'run');
-      mocha.cleanReferencesAfterRun(false);
-      mocha.run();
-      runStub.callArg(0);
-      mocha.run();
-      runStub.callArg(0);
-      expect(runStub, 'called times', 2);
-    });
+      it('should execute the callback when complete', function(done) {
+        mocha.run(done);
+      });
 
-    it('should reset between runs', function() {
-      var mocha = new Mocha(opts);
-      var runStub = sandbox.stub(Mocha.Runner.prototype, 'run');
-      var resetStub = sandbox.stub(Mocha.Suite.prototype, 'reset');
-      mocha.cleanReferencesAfterRun(false);
-      mocha.run();
-      runStub.callArg(0);
-      mocha.run();
-      expect(resetStub, 'was called once');
-    });
+      describe('when a run is in progress', function() {
+        it('should throw', function(done) {
+          mocha.run(done); // this is async!
+          expect(
+            function() {
+              mocha.run();
+            },
+            'to throw',
+            {
+              message:
+                'Mocha instance is currently running tests, cannot start a next test run until this one is done',
+              code: 'ERR_MOCHA_INSTANCE_ALREADY_RUNNING',
+              instance: mocha
+            }
+          );
+        });
+
+        it('should not call `Runner#run`', function(done) {
+          mocha.run(done); // this is async!
+          try {
+            mocha.run();
+          } catch (ignored) {
+          } finally {
+            expect(runner.run, 'was called once');
+          }
+        });
+      });
 
-    it('should dispose the previous runner when the next run starts', function() {
-      var mocha = new Mocha(opts);
-      var runStub = sandbox.stub(Mocha.Runner.prototype, 'run');
-      var disposeStub = sandbox.stub(Mocha.Runner.prototype, 'dispose');
-      mocha.cleanReferencesAfterRun(false);
-      mocha.run();
-      runStub.callArg(0);
-      expect(disposeStub, 'was not called');
-      mocha.run();
-      expect(disposeStub, 'was called once');
-    });
+      describe('when the `Mocha` instance is already disposed', function() {
+        beforeEach(function() {
+          mocha.dispose();
+        });
+
+        it('should throw', function() {
+          expect(
+            function() {
+              mocha.run();
+            },
+            'to throw',
+            {
+              message:
+                'Mocha instance is already disposed, cannot start a new test run. Please create a new mocha instance. Be sure to set disable `cleanReferencesAfterRun` when you want to reuse the same mocha instance for multiple test runs.',
+              code: 'ERR_MOCHA_INSTANCE_ALREADY_DISPOSED',
+              cleanReferencesAfterRun: true,
+              instance: mocha
+            }
+          );
+        });
+
+        it('should not call `Runner#run`', function() {
+          try {
+            mocha.run();
+          } catch (ignored) {
+          } finally {
+            expect(runner.run, 'was not called');
+          }
+        });
+      });
 
-    describe('#reporter("xunit")#run(fn)', function() {
-      // :TBD: Why does specifying reporter differentiate this test from preceding one
-      it('should not raise errors if callback was not provided', function() {
-        var mocha = new Mocha();
-        expect(function() {
+      describe('when a run has finished and is called again', function() {
+        beforeEach(function(done) {
+          mocha.run(function() {
+            runner.run.reset();
+            done();
+          });
+        });
+
+        it('should throw', function() {
+          expect(
+            function() {
+              mocha.run();
+            },
+            'to throw',
+            {
+              message:
+                'Mocha instance is already disposed, cannot start a new test run. Please create a new mocha instance. Be sure to set disable `cleanReferencesAfterRun` when you want to reuse the same mocha instance for multiple test runs.',
+              code: 'ERR_MOCHA_INSTANCE_ALREADY_DISPOSED',
+              instance: mocha
+            }
+          );
+        });
+
+        it('should not call `Runner#run()`', function() {
           try {
-            mocha.reporter('xunit').run();
-          } catch (e) {
-            console.log(e);
-            expect.fail(e.message);
+            mocha.run();
+          } catch (ignored) {
+          } finally {
+            expect(runner.run, 'was not called');
           }
-        }, 'not to throw');
+        });
       });
-    });
-  });
 
-  describe('#unloadFiles()', function() {
-    it('should reset referencesCleaned and allow for next run', function() {
-      var mocha = new Mocha(opts);
-      var runStub = sandbox.stub(Mocha.Runner.prototype, 'run');
-      mocha.run();
-      runStub.callArg(0);
-      mocha.unloadFiles();
-      expect(function() {
-        mocha.run();
-      }, 'not to throw');
+      describe('when Mocha configured for multiple runs and multiple runs are attempted', function() {
+        beforeEach(function() {
+          mocha.cleanReferencesAfterRun(false);
+        });
+
+        it('should not throw', function(done) {
+          mocha.run(function() {
+            mocha.run(done);
+          });
+        });
+
+        it('should call `Runner#run` for each call', function(done) {
+          mocha.run(function() {
+            mocha.run(function() {
+              expect(runner.run, 'was called twice');
+              done();
+            });
+          });
+        });
+
+        it('should reset the root Suite between runs', function(done) {
+          mocha.run(function() {
+            mocha.run(function() {
+              expect(suite.reset, 'was called once');
+              done();
+            });
+          });
+        });
+
+        it('should dispose the previous runner', function(done) {
+          mocha.run(function() {
+            mocha.run(function() {
+              expect(runner.dispose, 'was called once');
+              done();
+            });
+          });
+        });
+      });
     });
 
-    it('should not be allowed when the current instance is already disposed', function() {
-      var mocha = new Mocha(opts);
-      mocha.dispose();
-      expect(
-        function() {
+    describe('unloadFiles()', function() {
+      it('should reset referencesCleaned and allow for next run', function(done) {
+        mocha.run(function() {
           mocha.unloadFiles();
-        },
-        'to throw',
-        'Mocha instance is already disposed, it cannot be used again.'
-      );
+          mocha.run(done);
+        });
+      });
+
+      it('should not be allowed when the current instance is already disposed', function() {
+        mocha.dispose();
+        expect(
+          function() {
+            mocha.unloadFiles();
+          },
+          'to throw',
+          'Mocha instance is already disposed, it cannot be used again.'
+        );
+      });
     });
   });
 });