diff --git a/.gitignore b/.gitignore
index 404589376a..02634697bf 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,25 +1,143 @@
-.DS_Store
-node_modules
-*.sock
-*.sw*
-.idea
-*.iml
-*.patch
-*.diff
-npm-debug.log*
-.envrc
+# Mocha-specific
+docs/_site
+docs/_dist
+mocha.js
 .karma/
+!lib/mocha.js
+
+#########################################
+# NON-MOCHA STUFF GOES BELOW THIS THING #
+#########################################
+
+# Git mergetool
+# Use `git config mergetool.keepBackup false` to stop generating these files
 *.orig
-.nyc_output/
-coverage/
+
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# nyc/istanbul
+coverage
+.nyc_output
+
+# Dependencies
+node_modules/
+
+# npm
+.npm
+*.tgz
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# dotenv environment variables file
+.env
+.env.test
+
+# Yarn
 yarn.lock
-/mocha.js
-# artifacts from various diff tools
+.yarn-integrity
+
+# Various temporary files
+*~
+
+# Emacs
+\#*\#
+/.emacs.desktop
+/.emacs.desktop.lock
+*.elc
+auto-save-list
+tramp
+.\#*
+
+# Vim
+[._]*.s[a-v][a-z]
+[._]*.sw[a-p]
+[._]s[a-rt-v][a-z]
+[._]ss[a-gi-z]
+[._]sw[a-p]
+Session.vim
+[._]*.un~
+
+# Diff
+*.patch
+*.diff
+
+# VSCode
+.vscode/
+
+# JetBrains' IDEs
+.idea/
+*.iws
+out/
+.idea_modules/
+atlassian-ide-plugin.xml
+
+# SourceTree
 *_BACKUP_*
 *_BASE_*
 *_LOCAL_*
 *_REMOTE_*
-docs/_site
-docs/_dist
-out/
-.vscode/
+
+# SublimeText
+*.tmlanguage.cache
+*.tmPreferences.cache
+*.stTheme.cache
+*.sublime-workspace
+*.sublime-project
+sftp-config.json
+Package Control.last-run
+Package Control.ca-list
+Package Control.ca-bundle
+Package Control.system-ca-bundle
+Package Control.cache/
+Package Control.ca-certs/
+Package Control.merged-ca-bundle
+Package Control.user-ca-bundle
+oscrypto-ca-bundle.crt
+bh_unicode_properties.cache
+GitHub.sublime-settings
+
+# direnv
+.envrc
+
+# Linux
+.fuse_hidden*
+.directory
+.Trash-*
+.nfs*
+
+# Windows
+Thumbs.db
+ehthumbs.db
+ehthumbs_vista.db
+*.stackdump
+[Dd]esktop.ini
+$RECYCLE.BIN/
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+*.lnk
+
+# macOS
+.DS_Store
+.AppleDouble
+.LSOverride
+._*
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+# SauceConnect
+*.sock
diff --git a/.wallaby.js b/.wallaby.js
index 1ac49077f5..fa6063fa55 100644
--- a/.wallaby.js
+++ b/.wallaby.js
@@ -17,13 +17,13 @@ module.exports = () => {
       },
       'package.json',
       'test/opts/mocha.opts',
-      'mocharc.yml',
-      '!lib/browser/**/*.js'
+      'mocharc.yml'
     ],
     filesWithNoCoverageCalculated: [
       'test/**/*.fixture.js',
       'test/setup.js',
-      'test/assertions.js'
+      'test/assertions.js',
+      'lib/browser/**/*.js'
     ],
     tests: ['test/unit/**/*.spec.js', 'test/node-unit/**/*.spec.js'],
     env: {
diff --git a/lib/cli/run.js b/lib/cli/run.js
index e6c14f67ad..1d8a26d872 100644
--- a/lib/cli/run.js
+++ b/lib/cli/run.js
@@ -9,8 +9,10 @@
 
 const Mocha = require('../mocha');
 const ansi = require('ansi-colors');
-const errors = require('../errors');
-const createInvalidArgumentValueError = errors.createInvalidArgumentValueError;
+const {
+  createInvalidArgumentValueError,
+  createMissingArgumentError
+} = require('../errors');
 
 const {
   list,
@@ -258,13 +260,15 @@ exports.builder = yargs =>
 
       // yargs.implies() isn't flexible enough to handle this
       if (argv.invert && !('fgrep' in argv || 'grep' in argv)) {
-        throw new Error(
-          '"--invert" requires one of "--fgrep <str>" or "--grep <regexp>"'
+        throw createMissingArgumentError(
+          '"--invert" requires one of "--fgrep <str>" or "--grep <regexp>"',
+          '--fgrep|--grep',
+          'string|regexp'
         );
       }
 
       if (argv.compilers) {
-        throw new Error(
+        throw createInvalidArgumentValueError(
           `--compilers is DEPRECATED and no longer supported.
           See ${ansi.cyan('https://git.io/vdcSr')} for migration information.`
         );
diff --git a/lib/mocha.js b/lib/mocha.js
index c703e09dee..687f5c77a3 100644
--- a/lib/mocha.js
+++ b/lib/mocha.js
@@ -92,7 +92,7 @@ function Mocha(options) {
   this.files = [];
   this.options = options;
   // root suite
-  this.suite = new exports.Suite('', new exports.Context());
+  this.suite = new exports.Suite('', new exports.Context(), true);
 
   if ('useColors' in options) {
     utils.deprecate(
diff --git a/lib/suite.js b/lib/suite.js
index 64e7db4b24..2cb3a39de9 100644
--- a/lib/suite.js
+++ b/lib/suite.js
@@ -22,9 +22,7 @@ var createInvalidArgumentTypeError = errors.createInvalidArgumentTypeError;
 exports = module.exports = Suite;
 
 /**
- * Create a new `Suite` with the given `title` and parent `Suite`. When a suite
- * with the same title is already present, that suite is returned to provide
- * nicer reporter and more flexible meta-testing.
+ * Create a new `Suite` with the given `title` and parent `Suite`.
  *
  * @memberof Mocha
  * @public
@@ -41,15 +39,18 @@ exports.create = function(parent, title) {
 };
 
 /**
- * Initialize a new `Suite` with the given `title` and `ctx`. Derived from [EventEmitter](https://nodejs.org/api/events.html#events_class_eventemitter)
+ * Constructs a new `Suite` instance with the given `title`, `ctx`, and `isRoot`.
  *
- * @memberof Mocha
  * @public
  * @class
- * @param {string} title
- * @param {Context} parentContext
+ * @extends EventEmitter
+ * @memberof Mocha
+ * @see {@link https://nodejs.org/api/events.html#events_class_eventemitter|EventEmitter}
+ * @param {string} title - Suite title.
+ * @param {Context} parentContext - Parent context instance.
+ * @param {boolean} [isRoot=false] - Whether this is the root suite.
  */
-function Suite(title, parentContext) {
+function Suite(title, parentContext, isRoot) {
   if (!utils.isString(title)) {
     throw createInvalidArgumentTypeError(
       'Suite argument "title" must be a string. Received type "' +
@@ -70,7 +71,7 @@ function Suite(title, parentContext) {
   this._beforeAll = [];
   this._afterEach = [];
   this._afterAll = [];
-  this.root = !title;
+  this.root = isRoot === true;
   this._timeout = 2000;
   this._enableTimeouts = true;
   this._slow = 75;
@@ -326,6 +327,7 @@ Suite.prototype.afterEach = function(title, fn) {
  */
 Suite.prototype.addSuite = function(suite) {
   suite.parent = this;
+  suite.root = false;
   suite.timeout(this.timeout());
   suite.retries(this.retries());
   suite.enableTimeouts(this.enableTimeouts());
diff --git a/lib/utils.js b/lib/utils.js
index c6d42ba9a5..fc0aa640fd 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -83,6 +83,10 @@ function ignored(path) {
 /**
  * Lookup files in the given `dir`.
  *
+ * @description
+ * Filenames are returned in _traversal_ order by the OS/filesystem.
+ * **Make no assumption that the names will be sorted in any fashion.**
+ *
  * @private
  * @param {string} dir
  * @param {string[]} [ext=['.js']]
@@ -502,12 +506,16 @@ exports.canonicalize = function canonicalize(value, stack, typeHint) {
 /**
  * Lookup file names at the given `path`.
  *
- * @memberof Mocha.utils
+ * @description
+ * Filenames are returned in _traversal_ order by the OS/filesystem.
+ * **Make no assumption that the names will be sorted in any fashion.**
+ *
  * @public
- * @param {string} filepath Base path to start searching from.
- * @param {string[]} extensions File extensions to look for.
- * @param {boolean} recursive Whether or not to recurse into subdirectories.
+ * @memberof Mocha.utils
  * @todo Fix extension handling
+ * @param {string} filepath - Base path to start searching from.
+ * @param {string[]} extensions - File extensions to look for.
+ * @param {boolean} recursive - Whether to recurse into subdirectories.
  * @return {string[]} An array of paths.
  */
 exports.lookupFiles = function lookupFiles(filepath, extensions, recursive) {
diff --git a/package-lock.json b/package-lock.json
index f84514d583..b88e5e1f77 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -841,7 +841,7 @@
     },
     "ansi-escapes": {
       "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.1.0.tgz",
+      "resolved": "http://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.1.0.tgz",
       "integrity": "sha512-UgAb8H9D41AQnu/PbWlCofQVcnV4Gs2bBJi9eZPxfU/hgglFh3SMDMENRIqdr7H6XFnXdoknctFByVsCOotTVw==",
       "dev": true
     },
@@ -899,7 +899,7 @@
     "aproba": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz",
-      "integrity": "sha1-aALmJk79GMeQobDVF/DyYnvyyUo=",
+      "integrity": "sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw==",
       "dev": true
     },
     "archive-type": {
@@ -1521,7 +1521,7 @@
     },
     "async": {
       "version": "0.2.9",
-      "resolved": "https://registry.npmjs.org/async/-/async-0.2.9.tgz",
+      "resolved": "http://registry.npmjs.org/async/-/async-0.2.9.tgz",
       "integrity": "sha1-32MGD789Myhqdqr21Vophtn/hhk=",
       "dev": true
     },
@@ -1851,7 +1851,7 @@
     },
     "bl": {
       "version": "1.2.2",
-      "resolved": "https://registry.npmjs.org/bl/-/bl-1.2.2.tgz",
+      "resolved": "http://registry.npmjs.org/bl/-/bl-1.2.2.tgz",
       "integrity": "sha512-e8tQYnZodmebYDWGH7KMRvtzKXaJHx3BbilrgZCfvyLUYdKpK1t5PSPmpkny/SgiTSCnjfLW7v5rlONXVFkQEA==",
       "dev": true,
       "requires": {
@@ -1883,7 +1883,7 @@
     "bn.js": {
       "version": "4.11.8",
       "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.8.tgz",
-      "integrity": "sha1-LN4J617jQfSEdGuwMJsyU7GxRC8=",
+      "integrity": "sha512-ItfYfPLkWHUjckQCk8xC+LwxgK8NYcXywGigJgSwOP8Y2iyWT4f2vsZnoOXTTbo+o5yXmIUJ4gn5538SO5S3gA==",
       "dev": true
     },
     "body-parser": {
@@ -2147,7 +2147,7 @@
     "browser-stdout": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.1.tgz",
-      "integrity": "sha1-uqVZ7hTO1zRSIputcyZGfGH6vWA="
+      "integrity": "sha512-qhAVI1+Av2X7qelOfAIYwXONood6XlZE/fXaBSmW/T5SzLAmCgzi+eiWE7fUvbHaeNBQH13UftjpXxsfLkMpgw=="
     },
     "browser-sync": {
       "version": "2.26.3",
@@ -2829,7 +2829,7 @@
     },
     "browserify-aes": {
       "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/browserify-aes/-/browserify-aes-1.2.0.tgz",
+      "resolved": "http://registry.npmjs.org/browserify-aes/-/browserify-aes-1.2.0.tgz",
       "integrity": "sha512-+7CHXqGuspUn/Sl5aO7Ea0xWGAtETPXNSAjHo48JfLdPWcMng33Xe4znFvQweqc/uzk5zSOI3H52CYnjCfb5hA==",
       "dev": true,
       "requires": {
@@ -3001,7 +3001,7 @@
       "dependencies": {
         "uuid": {
           "version": "2.0.3",
-          "resolved": "https://registry.npmjs.org/uuid/-/uuid-2.0.3.tgz",
+          "resolved": "http://registry.npmjs.org/uuid/-/uuid-2.0.3.tgz",
           "integrity": "sha1-Z+LoY3lyFVMN/zGOW/nc6/1Hsho=",
           "dev": true
         }
@@ -3162,7 +3162,7 @@
     },
     "capitalize": {
       "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/capitalize/-/capitalize-1.0.0.tgz",
+      "resolved": "http://registry.npmjs.org/capitalize/-/capitalize-1.0.0.tgz",
       "integrity": "sha1-3IAsWAruEBkpAg0soUtMqKCuRL4=",
       "dev": true
     },
@@ -3384,7 +3384,7 @@
     "cipher-base": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/cipher-base/-/cipher-base-1.0.4.tgz",
-      "integrity": "sha1-h2Dk7MJy9MNjUy+SbYdKriwTl94=",
+      "integrity": "sha512-Kkht5ye6ZGmwv40uUDZztayT2ThLQGfnj/T71N/XzeZeo3nf8foyW7zGTsPYkEya3m5f3cAypH+qe7YOrM1U2Q==",
       "dev": true,
       "requires": {
         "inherits": "^2.0.1",
@@ -3467,7 +3467,7 @@
       "dependencies": {
         "slice-ansi": {
           "version": "0.0.4",
-          "resolved": "https://registry.npmjs.org/slice-ansi/-/slice-ansi-0.0.4.tgz",
+          "resolved": "http://registry.npmjs.org/slice-ansi/-/slice-ansi-0.0.4.tgz",
           "integrity": "sha1-7b+JA/ZvfOL46v1s7tZeJkyDGzU=",
           "dev": true
         }
@@ -3599,7 +3599,7 @@
     "color-support": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/color-support/-/color-support-1.1.3.tgz",
-      "integrity": "sha1-k4NDeaHMmgxh+C9S8NBDIiUb1aI=",
+      "integrity": "sha512-qiBjkpbMLO/HL68y+lh4q0/O1MZFj2RX6X/KmMa3+gJD3z+WwI1ZzDHysvqHGS3mP6mznPckpXmw1nI9cJjyRg==",
       "dev": true
     },
     "colors": {
@@ -3631,7 +3631,7 @@
       "dependencies": {
         "convert-source-map": {
           "version": "1.1.3",
-          "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-1.1.3.tgz",
+          "resolved": "http://registry.npmjs.org/convert-source-map/-/convert-source-map-1.1.3.tgz",
           "integrity": "sha1-SCnId+n+SbMWHzvzZziI4gRpmGA=",
           "dev": true
         },
@@ -3975,7 +3975,7 @@
     },
     "create-hash": {
       "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/create-hash/-/create-hash-1.2.0.tgz",
+      "resolved": "http://registry.npmjs.org/create-hash/-/create-hash-1.2.0.tgz",
       "integrity": "sha512-z00bCGNHDG8mHAkP7CtT1qVu+bFQUPjYq/4Iv3C3kWjTFV10zIjfSoeqXo9Asws8gwSHDGj/hl2u4OGIjapeCg==",
       "dev": true,
       "requires": {
@@ -3988,7 +3988,7 @@
     },
     "create-hmac": {
       "version": "1.1.7",
-      "resolved": "https://registry.npmjs.org/create-hmac/-/create-hmac-1.1.7.tgz",
+      "resolved": "http://registry.npmjs.org/create-hmac/-/create-hmac-1.1.7.tgz",
       "integrity": "sha512-MJG9liiZ+ogc4TzUwuvbER1JRdgvUFSB5+VR/g5h82fGaIRWMWddtKBHi7/sVhfjQZ6SehlyhvQYrcYkaUIpLg==",
       "dev": true,
       "requires": {
@@ -4003,9 +4003,19 @@
     "createerror": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/createerror/-/createerror-1.3.0.tgz",
-      "integrity": "sha1-xma9TNa5TjVBU5ZWnUZJ3QzbMxM=",
+      "integrity": "sha512-w9UZUtkaGd8MfS7eMG7Sa0lV5vCJghqQfiOnwNVrPhbZScUp5h0jwYoAF933MKlotlG1JAJOCCT3xU6r+SDKNw==",
       "dev": true
     },
+    "cross-env": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/cross-env/-/cross-env-5.2.0.tgz",
+      "integrity": "sha512-jtdNFfFW1hB7sMhr/H6rW1Z45LFqyI431m3qU6bFXcQ3Eh7LtBuG3h74o7ohHZ3crrRkkqHlo4jYHFPcjroANg==",
+      "dev": true,
+      "requires": {
+        "cross-spawn": "^6.0.5",
+        "is-windows": "^1.0.0"
+      }
+    },
     "cross-spawn": {
       "version": "6.0.5",
       "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-6.0.5.tgz",
@@ -4870,7 +4880,7 @@
       "dependencies": {
         "minimist": {
           "version": "1.2.0",
-          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
           "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
           "dev": true
         },
@@ -4904,7 +4914,7 @@
       "dependencies": {
         "minimist": {
           "version": "1.2.0",
-          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
           "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
           "dev": true
         }
@@ -4940,11 +4950,11 @@
     "diff": {
       "version": "3.5.0",
       "resolved": "https://registry.npmjs.org/diff/-/diff-3.5.0.tgz",
-      "integrity": "sha1-gAwN0eCov7yVg1wgKtIg/jF+WhI="
+      "integrity": "sha512-A46qtFgd+g7pDZinpnwiRJtxbC1hpgf0uzP3iG89scHk0AUC7A1TGxf5OiiOUv/JMZR8GOt8hL900hV0bOy5xA=="
     },
     "diffie-hellman": {
       "version": "5.0.3",
-      "resolved": "https://registry.npmjs.org/diffie-hellman/-/diffie-hellman-5.0.3.tgz",
+      "resolved": "http://registry.npmjs.org/diffie-hellman/-/diffie-hellman-5.0.3.tgz",
       "integrity": "sha512-kqag/Nl+f3GwyK25fhUMYj81BUOrZ9IuJsjIcDE5icNM9FJHAVm3VcUDxdLPoQtTuUylWm6ZIknYJwwaPxsUzg==",
       "dev": true,
       "requires": {
@@ -5121,7 +5131,7 @@
     },
     "duplexer": {
       "version": "0.1.1",
-      "resolved": "https://registry.npmjs.org/duplexer/-/duplexer-0.1.1.tgz",
+      "resolved": "http://registry.npmjs.org/duplexer/-/duplexer-0.1.1.tgz",
       "integrity": "sha1-rOb/gIwc5mtX0ev5eXessCM0z8E=",
       "dev": true
     },
@@ -5422,7 +5432,7 @@
     },
     "es6-promisify": {
       "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/es6-promisify/-/es6-promisify-5.0.0.tgz",
+      "resolved": "http://registry.npmjs.org/es6-promisify/-/es6-promisify-5.0.0.tgz",
       "integrity": "sha1-UQnWLz5W6pZ8S2NQWu8IKRyKUgM=",
       "dev": true,
       "requires": {
@@ -5487,9 +5497,9 @@
       }
     },
     "eslint": {
-      "version": "5.10.0",
-      "resolved": "https://registry.npmjs.org/eslint/-/eslint-5.10.0.tgz",
-      "integrity": "sha512-HpqzC+BHULKlnPwWae9MaVZ5AXJKpkxCVXQHrFaRw3hbDj26V/9ArYM4Rr/SQ8pi6qUPLXSSXC4RBJlyq2Z2OQ==",
+      "version": "5.11.1",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-5.11.1.tgz",
+      "integrity": "sha512-gOKhM8JwlFOc2acbOrkYR05NW8M6DCMSvfcJiBB5NDxRE1gv8kbvxKaC9u69e6ZGEMWXcswA/7eKR229cEIpvg==",
       "dev": true,
       "requires": {
         "@babel/code-frame": "^7.0.0",
@@ -5532,9 +5542,9 @@
       },
       "dependencies": {
         "ajv": {
-          "version": "6.6.2",
-          "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.6.2.tgz",
-          "integrity": "sha512-FBHEW6Jf5TB9MGBgUUA9XHkTbjXYfAUjY43ACMfmdMRHniyoMHjHjzD50OK8LGDWQwp4rWEsIq5kEqq7rvIM1g==",
+          "version": "6.7.0",
+          "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.7.0.tgz",
+          "integrity": "sha512-RZXPviBTtfmtka9n9sy1N5M5b82CbxWIR6HIis4s3WQTXDJamc/0gpCWNGz6EWdWp4DOfjzJfhz/AS9zVPjjWg==",
           "dev": true,
           "requires": {
             "fast-deep-equal": "^2.0.1",
@@ -5553,37 +5563,25 @@
           "version": "3.2.1",
           "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
           "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
-          "dev": true,
           "requires": {
             "color-convert": "^1.9.0"
           }
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           "integrity": "sha512-NwW69J42EsCSanF8kyn5upxvjp5ds+t3+udGBeTbFnERA+lF541DDpMawzo4z6W/QrzNM18D+BPMiOBibnFV5A==",
           "dev": true,
           "requires": {
@@ -15721,7 +15849,7 @@
           "dependencies": {
             "cliui": {
               "version": "4.1.0",
-              "resolved": "https://registry.npmjs.org/cliui/-/cliui-4.1.0.tgz",
+              "resolved": false,
               "integrity": "sha512-4FG+RSG9DL7uEwRUZXZn3SS34DiDPfzP0VOiEwtUWlE+AR2EIg+hSyvrIgUUfhdgR/UkAeW2QHgeP+hWrXs7jQ==",
               "dev": true,
               "requires": {
@@ -15786,7 +15914,7 @@
           "dependencies": {
             "camelcase": {
               "version": "4.1.0",
-              "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-4.1.0.tgz",
+              "resolved": false,
               "integrity": "sha1-1UVjW+HjPFQmScaRc+Xeas+uNN0=",
               "dev": true
             }
@@ -16269,7 +16397,7 @@
     },
     "parse-asn1": {
       "version": "5.1.1",
-      "resolved": "https://registry.npmjs.org/parse-asn1/-/parse-asn1-5.1.1.tgz",
+      "resolved": "http://registry.npmjs.org/parse-asn1/-/parse-asn1-5.1.1.tgz",
       "integrity": "sha512-KPx7flKXg775zZpnp9SxJlz00gTd4BmJ2yJufSc44gMCRrRQ7NSzAcSJQfifuOLgW6bEi+ftrALtsgALeB2Adw==",
       "dev": true,
       "requires": {
@@ -16450,7 +16578,7 @@
     },
     "path-is-absolute": {
       "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
+      "resolved": "http://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
       "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18="
     },
     "path-is-inside": {
@@ -16525,7 +16653,7 @@
     },
     "pause-stream": {
       "version": "0.0.11",
-      "resolved": "https://registry.npmjs.org/pause-stream/-/pause-stream-0.0.11.tgz",
+      "resolved": "http://registry.npmjs.org/pause-stream/-/pause-stream-0.0.11.tgz",
       "integrity": "sha1-/lo0sMvOErWqaitAPuLnO2AvFEU=",
       "dev": true,
       "requires": {
@@ -16584,7 +16712,7 @@
         "postcss": {
           "version": "5.2.18",
           "resolved": "https://registry.npmjs.org/postcss/-/postcss-5.2.18.tgz",
-          "integrity": "sha1-ut+hSX1GJE9jkPWLMZgw2RB4U8U=",
+          "integrity": "sha512-zrUjRRe1bpXKsX1qAJNJjqZViErVuyEkMTRrwu4ud4sbTtIBRmtaYDrHmcGgmrbsW3MHfmtIf+vJumgQn+PrXg==",
           "dev": true,
           "requires": {
             "chalk": "^1.1.3",
@@ -16839,7 +16967,7 @@
         "source-map": {
           "version": "0.6.1",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
-          "integrity": "sha1-dHIq8y6WFOnCh6jQu95IteLxomM=",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
           "dev": true
         },
         "supports-color": {
@@ -17176,7 +17304,7 @@
         "postcss": {
           "version": "5.2.18",
           "resolved": "https://registry.npmjs.org/postcss/-/postcss-5.2.18.tgz",
-          "integrity": "sha1-ut+hSX1GJE9jkPWLMZgw2RB4U8U=",
+          "integrity": "sha512-zrUjRRe1bpXKsX1qAJNJjqZViErVuyEkMTRrwu4ud4sbTtIBRmtaYDrHmcGgmrbsW3MHfmtIf+vJumgQn+PrXg==",
           "dev": true,
           "requires": {
             "chalk": "^1.1.3",
@@ -17871,7 +17999,7 @@
     },
     "readable-stream": {
       "version": "2.3.6",
-      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
+      "resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
       "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
       "dev": true,
       "requires": {
@@ -18371,9 +18499,9 @@
       "integrity": "sha512-TTlYpa+OL+vMMNG24xSlQGEJ3B/RzEfUlLct7b5G/ytav+wPrplCpVMFuwzXbkecJrb6IYo1iFb0S9v37754mg=="
     },
     "rewiremock": {
-      "version": "3.12.3",
-      "resolved": "https://registry.npmjs.org/rewiremock/-/rewiremock-3.12.3.tgz",
-      "integrity": "sha512-6OSIpeAEmHejoxBb1UEg7cdgfiA/BXuGT6qcM1YVWbfme8ybzTJIKANaLDLFfU+juMevKyM8F3OSw9gBGo5PJg==",
+      "version": "3.13.0",
+      "resolved": "https://registry.npmjs.org/rewiremock/-/rewiremock-3.13.0.tgz",
+      "integrity": "sha512-1MkO4mX4j31GilbMsqdgLNXjmrHo9EUKQFCa82rLye8ltOHnJe0rRaHUSKz2yUClr8l0Qnj1ZTjZHmp6vNTrzQ==",
       "dev": true,
       "requires": {
         "babel-runtime": "^6.26.0",
@@ -18384,27 +18512,6 @@
         "path-parse": "^1.0.5",
         "wipe-node-cache": "^2.1.0",
         "wipe-webpack-cache": "^2.1.0"
-      },
-      "dependencies": {
-        "lodash.template": {
-          "version": "4.4.0",
-          "resolved": "https://registry.npmjs.org/lodash.template/-/lodash.template-4.4.0.tgz",
-          "integrity": "sha1-5zoDhcg1VZF0bgILmWecaQ5o+6A=",
-          "dev": true,
-          "requires": {
-            "lodash._reinterpolate": "~3.0.0",
-            "lodash.templatesettings": "^4.0.0"
-          }
-        },
-        "lodash.templatesettings": {
-          "version": "4.1.0",
-          "resolved": "https://registry.npmjs.org/lodash.templatesettings/-/lodash.templatesettings-4.1.0.tgz",
-          "integrity": "sha1-K01OlbpEDZFf8IvImeRVNmZxMxY=",
-          "dev": true,
-          "requires": {
-            "lodash._reinterpolate": "~3.0.0"
-          }
-        }
       }
     },
     "rfdc": {
@@ -18435,12 +18542,12 @@
       }
     },
     "rimraf": {
-      "version": "2.6.2",
-      "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.6.2.tgz",
-      "integrity": "sha512-lreewLK/BlghmxtfH36YYVg1i8IAce4TI7oao75I1g245+6BctqTVQiBP3YUJ9C6DQOXJmkYR9X9fCLtCOJc5w==",
+      "version": "2.6.3",
+      "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.6.3.tgz",
+      "integrity": "sha512-mwqeW5XsA2qAejG46gYdENaxXjx9onRNCfn7L0duuP4hCuTIi/QO7PDK07KJfp1d+izWPrzEJDcSqBa0OZQriA==",
       "dev": true,
       "requires": {
-        "glob": "^7.0.5"
+        "glob": "^7.1.3"
       }
     },
     "ripemd160": {
@@ -18491,7 +18598,7 @@
     },
     "safe-regex": {
       "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/safe-regex/-/safe-regex-1.1.0.tgz",
+      "resolved": "http://registry.npmjs.org/safe-regex/-/safe-regex-1.1.0.tgz",
       "integrity": "sha1-QKNmnzsHfR6UPURinhV91IAjvy4=",
       "requires": {
         "ret": "~0.1.10"
@@ -18539,7 +18646,7 @@
     "sax": {
       "version": "1.2.4",
       "resolved": "https://registry.npmjs.org/sax/-/sax-1.2.4.tgz",
-      "integrity": "sha1-KBYjTiN4vdxOU1T6tcqold9xANk=",
+      "integrity": "sha512-NqVDv9TpANUjFm0N8uM5GxL36UgKi9/atZw+x7YFnQ8ckwFGKrl4xX4yWtrey3UJm5nP1kUbnYgLopqWNSRhWw==",
       "dev": true
     },
     "saxes": {
@@ -18791,7 +18898,7 @@
     },
     "sha.js": {
       "version": "2.4.11",
-      "resolved": "https://registry.npmjs.org/sha.js/-/sha.js-2.4.11.tgz",
+      "resolved": "http://registry.npmjs.org/sha.js/-/sha.js-2.4.11.tgz",
       "integrity": "sha512-QMEp5B7cftE7APOjk5Y6xgrbWu+WkLVQwk8JNjZ8nKRciZaByEW6MubieAiToS7+dwvrjGhH8jRXz3MVd0AYqQ==",
       "dev": true,
       "requires": {
@@ -19354,7 +19461,7 @@
     },
     "split": {
       "version": "0.3.3",
-      "resolved": "https://registry.npmjs.org/split/-/split-0.3.3.tgz",
+      "resolved": "http://registry.npmjs.org/split/-/split-0.3.3.tgz",
       "integrity": "sha1-zQ7qXmOiEd//frDwkcQTPi0N0o8=",
       "dev": true,
       "requires": {
@@ -19434,7 +19541,7 @@
     },
     "starts-with": {
       "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/starts-with/-/starts-with-1.0.2.tgz",
+      "resolved": "http://registry.npmjs.org/starts-with/-/starts-with-1.0.2.tgz",
       "integrity": "sha1-Fnk6cp2J1M89T7LtovkIrjV/GW8=",
       "dev": true
     },
@@ -19562,7 +19669,7 @@
     },
     "stream-combiner": {
       "version": "0.0.4",
-      "resolved": "https://registry.npmjs.org/stream-combiner/-/stream-combiner-0.0.4.tgz",
+      "resolved": "http://registry.npmjs.org/stream-combiner/-/stream-combiner-0.0.4.tgz",
       "integrity": "sha1-TV5DPBhSYd3mI8o/RMWGvPXErRQ=",
       "dev": true,
       "requires": {
@@ -19797,7 +19904,7 @@
     },
     "strip-eof": {
       "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
+      "resolved": "http://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
       "integrity": "sha1-u0P/VZim6wXYm1n80SnJgzE2Br8="
     },
     "strip-indent": {
@@ -20159,7 +20266,7 @@
     "tar-pack": {
       "version": "3.4.1",
       "resolved": "https://registry.npmjs.org/tar-pack/-/tar-pack-3.4.1.tgz",
-      "integrity": "sha1-4dvAOpudO6B+iWrQJzF+tnmhCh8=",
+      "integrity": "sha512-PPRybI9+jM5tjtCbN2cxmmRU7YmqT3Zv/UDy48tAh2XRkLa9bAORtSWLkVc13+GJF+cdTh1yEnHEk3cpTaL5Kg==",
       "dev": true,
       "optional": true,
       "requires": {
@@ -20176,7 +20283,7 @@
         "debug": {
           "version": "2.6.9",
           "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
-          "integrity": "sha1-XRKFFd8TT/Mn6QpMk/Tgd6U2NB8=",
+          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
           "dev": true,
           "optional": true,
           "requires": {
@@ -20277,7 +20384,7 @@
       "dependencies": {
         "uuid": {
           "version": "2.0.3",
-          "resolved": "https://registry.npmjs.org/uuid/-/uuid-2.0.3.tgz",
+          "resolved": "http://registry.npmjs.org/uuid/-/uuid-2.0.3.tgz",
           "integrity": "sha1-Z+LoY3lyFVMN/zGOW/nc6/1Hsho=",
           "dev": true
         }
@@ -20492,7 +20599,7 @@
     "tmp": {
       "version": "0.0.33",
       "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.33.tgz",
-      "integrity": "sha1-bTQzWIl2jSGyvNoKonfO07G/rfk=",
+      "integrity": "sha512-jRCJlojKnZ3addtTOjdIqoRuPEKBvNXcGYqzO6zWZX8KfKEpnGY5jfggJQ3EjKuu8D4bJRr0y+cYJFmYbImXGw==",
       "dev": true,
       "requires": {
         "os-tmpdir": "~1.0.2"
@@ -20615,7 +20722,7 @@
     "toml": {
       "version": "2.3.3",
       "resolved": "https://registry.npmjs.org/toml/-/toml-2.3.3.tgz",
-      "integrity": "sha1-jWg9cpV3yyhiMd/HqK/+WNMXKPs=",
+      "integrity": "sha512-O7L5hhSQHxuufWUdcTRPfuTh3phKfAZ/dqfxZFoxPCj2RYmpaSGLEIs016FCXItQwNr08yefUB5TSjzRYnajTA==",
       "dev": true
     },
     "tough-cookie": {
@@ -20834,9 +20941,9 @@
       }
     },
     "unexpected": {
-      "version": "10.39.2",
-      "resolved": "https://registry.npmjs.org/unexpected/-/unexpected-10.39.2.tgz",
-      "integrity": "sha512-bL/e8kSBeqaIdEQfwSE64++i7YgsBiyveQkOkSXRCZBIaLCdpiyYwuczPzkXI3d9noczV1nXDzwzI3FwEqPq4g==",
+      "version": "10.40.2",
+      "resolved": "https://registry.npmjs.org/unexpected/-/unexpected-10.40.2.tgz",
+      "integrity": "sha512-xwLScBxEnHiK8H8yLblQ6u3Uoammhpk+oCB/HWiNY6exMEwxenUR+eWIKderEXQPOlZkUEakBAKborGJqK6hZQ==",
       "dev": true,
       "requires": {
         "array-changes": "3.0.1",
@@ -21757,7 +21864,7 @@
     "webidl-conversions": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-4.0.2.tgz",
-      "integrity": "sha1-qFWYCx8LazWbodXZ+zmulB+qY60=",
+      "integrity": "sha512-YQ+BmxuTgd6UXZW3+ICGfyqRyHXVlD5GtQr5+qjiNW7bF0cqrzX500HVXPBOvgXb5YnzDd+h0zqyv61KUD7+Sg==",
       "dev": true
     },
     "whatwg-encoding": {
@@ -21930,7 +22037,7 @@
     },
     "wrap-ansi": {
       "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+      "resolved": "http://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
       "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
       "requires": {
         "string-width": "^1.0.1",
diff --git a/package-scripts.js b/package-scripts.js
index 980f2724a4..561737dbd7 100644
--- a/package-scripts.js
+++ b/package-scripts.js
@@ -217,26 +217,26 @@ module.exports = {
           description: 'Run browser tests'
         },
         unit: {
-          script: 'NODE_PATH=. karma start --single-run',
+          script: 'cross-env NODE_PATH=. karma start --single-run',
           description: 'Run browser unit tests'
         },
         bdd: {
-          script: 'MOCHA_TEST=bdd nps test.browser.unit',
+          script: 'cross-env MOCHA_TEST=bdd nps test.browser.unit',
           description: 'Run browser BDD interface tests',
           hiddenFromHelp: true
         },
         tdd: {
-          script: 'MOCHA_TEST=tdd nps test.browser.unit',
+          script: 'cross-env MOCHA_TEST=tdd nps test.browser.unit',
           description: 'Run browser TDD interface tests',
           hiddenFromHelp: true
         },
         qunit: {
-          script: 'MOCHA_TEST=qunit nps test.browser.unit',
+          script: 'cross-env MOCHA_TEST=qunit nps test.browser.unit',
           description: 'Run browser QUnit interface tests',
           hiddenFromHelp: true
         },
         esm: {
-          script: 'MOCHA_TEST=esm nps test.browser.unit',
+          script: 'cross-env MOCHA_TEST=esm nps test.browser.unit',
           description: 'Run browser ES modules support test',
           hiddenFromHelp: true
         }
diff --git a/package.json b/package.json
index 1b9c56087c..154438b0bc 100644
--- a/package.json
+++ b/package.json
@@ -518,6 +518,7 @@
     "chai": "^4.2.0",
     "coffee-script": "^1.10.0",
     "coveralls": "^3.0.2",
+    "cross-env": "^5.2.0",
     "cross-spawn": "^6.0.5",
     "eslint": "^5.10.0",
     "eslint-config-prettier": "^3.3.0",
@@ -588,7 +589,8 @@
   },
   "prettier": {
     "singleQuote": true,
-    "bracketSpacing": false
+    "bracketSpacing": false,
+    "endOfLine": "auto"
   },
   "yargs": {
     "combine-arrays": true,
diff --git a/test/integration/events.spec.js b/test/integration/events.spec.js
new file mode 100644
index 0000000000..dc08a57381
--- /dev/null
+++ b/test/integration/events.spec.js
@@ -0,0 +1,59 @@
+'use strict';
+
+var helpers = require('./helpers');
+var runMochaJSON = helpers.runMochaJSON;
+
+describe('event order', function() {
+  describe('trivial test case', function() {
+    it('should assert trivial event order', function(done) {
+      runMochaJSON('runner/events-basic.fixture.js', [], function(err, res) {
+        if (err) {
+          done(err);
+          return;
+        }
+        expect(res, 'to have passed')
+          .and('to have passed test count', 2)
+          .and('to have passed test order', 'test A', 'test B')
+          .and('to have failed test count', 0);
+        done();
+      });
+    });
+  });
+
+  describe('--bail test case', function() {
+    it('should assert --bail event order', function(done) {
+      runMochaJSON('runner/events-bail.fixture.js', ['--bail'], function(
+        err,
+        res
+      ) {
+        if (err) {
+          done(err);
+          return;
+        }
+        expect(res, 'to have failed with error', 'error test A')
+          .and('to have failed test count', 1)
+          .and('to have passed test count', 0);
+        done();
+      });
+    });
+  });
+
+  describe('--retries test case', function() {
+    it('should assert --retries event order', function(done) {
+      runMochaJSON(
+        'runner/events-retries.fixture.js',
+        ['--retries', '1'],
+        function(err, res) {
+          if (err) {
+            done(err);
+            return;
+          }
+          expect(res, 'to have failed with error', 'error test A')
+            .and('to have failed test count', 1)
+            .and('to have passed test count', 0);
+          done();
+        }
+      );
+    });
+  });
+});
diff --git a/test/integration/fixtures/runner/events-bail.fixture.js b/test/integration/fixtures/runner/events-bail.fixture.js
new file mode 100644
index 0000000000..3a345f8169
--- /dev/null
+++ b/test/integration/fixtures/runner/events-bail.fixture.js
@@ -0,0 +1,29 @@
+'use strict';
+var Runner = require('../../../../lib/runner.js');
+var assert = require('assert');
+
+var emitOrder = [
+  'suite'/* incorrect order*/, 'start', 'suite',
+  'hook', 'hook end', 'test', 'hook', 'hook end', 'fail', 'test end', 'hook', 'hook end',
+  'hook', 'hook end', 'suite end', 'suite end', 'end'
+];
+
+var realEmit = Runner.prototype.emit;
+Runner.prototype.emit = function(event, ...args) {
+  // console.log(`emit: ${event}`);  
+  assert.strictEqual(event, emitOrder.shift());
+  return realEmit.call(this, event, ...args);
+};
+
+describe('suite A', function() {
+  before('before', function() {});
+  beforeEach('beforeEach', function() {});
+  it('test A', function() {
+    throw new Error('error test A');
+  });
+  describe('suite B', function() {
+    it('test B', function() {});
+  });
+  afterEach('afterEach', function() {});
+  after('after', function() {});
+});
diff --git a/test/integration/fixtures/runner/events-basic.fixture.js b/test/integration/fixtures/runner/events-basic.fixture.js
new file mode 100644
index 0000000000..81c55a8bb4
--- /dev/null
+++ b/test/integration/fixtures/runner/events-basic.fixture.js
@@ -0,0 +1,28 @@
+'use strict';
+var Runner = require('../../../../lib/runner.js');
+var assert = require('assert');
+
+var emitOrder = [
+  'suite'/* incorrect order*/, 'start', 'suite',
+  'hook', 'hook end', 'test', 'hook', 'hook end', 'pass', 'test end', 'hook', 'hook end',
+  'suite', 'test', 'hook', 'hook end', 'pass', 'test end', 'hook', 'hook end',
+  'suite end', 'hook', 'hook end', 'suite end', 'suite end', 'end'
+];
+
+var realEmit = Runner.prototype.emit;
+Runner.prototype.emit = function(event, ...args) {
+  // console.log(`emit: ${event}`);  
+  assert.strictEqual(event, emitOrder.shift());
+  return realEmit.call(this, event, ...args);
+};
+
+describe('suite A', function() {
+  before('before', function() {});
+  beforeEach('beforeEach', function() {});
+  it('test A', function() {});
+  describe('suite B', function() {
+    it('test B', function() {});
+  });
+  afterEach('afterEach', function() {});
+  after('after', function() {});
+});
diff --git a/test/integration/fixtures/runner/events-retries.fixture.js b/test/integration/fixtures/runner/events-retries.fixture.js
new file mode 100644
index 0000000000..a4547c8fa8
--- /dev/null
+++ b/test/integration/fixtures/runner/events-retries.fixture.js
@@ -0,0 +1,27 @@
+'use strict';
+var Runner = require('../../../../lib/runner.js');
+var assert = require('assert');
+
+var emitOrder = [
+  'suite'/* incorrect order*/, 'start', 'suite',
+  'hook', 'hook end', 'test', 'hook', 'hook end', 'retry', 'hook', 'hook end',
+  'test', 'hook', 'hook end', 'fail', 'test end', 'hook', 'hook end', 'hook', 'hook end',
+  'suite end', 'suite end', 'end'
+];
+
+var realEmit = Runner.prototype.emit;
+Runner.prototype.emit = function(event, ...args) {
+  // console.log(`emit: ${event}`);  
+  assert.strictEqual(event, emitOrder.shift());
+  return realEmit.call(this, event, ...args);
+};
+
+describe('suite A', function() {
+  before('before', function() {});
+  beforeEach('beforeEach', function() {});
+  it('test A', function() {
+    throw new Error('error test A');
+  });
+  afterEach('afterEach', function() {});
+  after('after', function() {});
+});
diff --git a/test/integration/options.spec.js b/test/integration/options.spec.js
index 81eac5786a..6854528566 100644
--- a/test/integration/options.spec.js
+++ b/test/integration/options.spec.js
@@ -346,6 +346,26 @@ describe('options', function() {
           done();
         });
       });
+
+      it('should throw an error when `--invert` used in isolation', function(done) {
+        args = ['--invert'];
+        runMocha(
+          'options/grep.fixture.js',
+          args,
+          function(err, res) {
+            if (err) {
+              done(err);
+              return;
+            }
+            expect(res, 'to satisfy', {
+              code: 1,
+              output: /--invert.*--grep <regexp>/
+            });
+            done();
+          },
+          {stdio: 'pipe'}
+        );
+      });
     });
   });
 
diff --git a/test/integration/reporters.spec.js b/test/integration/reporters.spec.js
index c78da8ab6b..d44a222324 100644
--- a/test/integration/reporters.spec.js
+++ b/test/integration/reporters.spec.js
@@ -134,7 +134,7 @@ describe('reporters', function() {
     describe('produces valid TAP v13 output', function() {
       var runFixtureAndValidateOutput = function(fixture, expected) {
         it('for ' + fixture, function(done) {
-          var args = ['--reporter=tap', '--reporter-options', 'tapVersion=13'];
+          var args = ['--reporter=tap', '--reporter-option', 'tapVersion=13'];
 
           run(fixture, args, function(err, res) {
             if (err) {
@@ -196,8 +196,42 @@ describe('reporters', function() {
       });
     });
 
+    it('should fail if given invalid `tapVersion`', function(done) {
+      var invalidTapVersion = 'nosuch';
+      var args = [
+        '--reporter=tap',
+        '--reporter-option',
+        'tapVersion=' + invalidTapVersion
+      ];
+
+      run(
+        'reporters.fixture.js',
+        args,
+        function(err, res) {
+          if (err) {
+            done(err);
+            return;
+          }
+
+          function dquote(s) {
+            return '"' + s + '"';
+          }
+
+          var pattern =
+            '^Error: invalid or unsupported TAP version: ' +
+            dquote(invalidTapVersion);
+          expect(res, 'to satisfy', {
+            code: 1,
+            output: new RegExp(pattern, 'm')
+          });
+          done();
+        },
+        {stdio: 'pipe'}
+      );
+    });
+
     it('places exceptions correctly in YAML blocks', function(done) {
-      var args = ['--reporter=tap', '--reporter-options', 'tapVersion=13'];
+      var args = ['--reporter=tap', '--reporter-option', 'tapVersion=13'];
 
       run('reporters.fixture.js', args, function(err, res) {
         if (err) {
diff --git a/test/unit/suite.spec.js b/test/unit/suite.spec.js
index 50a0bda332..fa57898a51 100644
--- a/test/unit/suite.spec.js
+++ b/test/unit/suite.spec.js
@@ -302,6 +302,27 @@ describe('Suite', function() {
     });
   });
 
+  describe('.create()', function() {
+    before(function() {
+      this.first = new Suite('Root suite', {}, true);
+      this.second = new Suite('RottenRoot suite', {}, true);
+      this.first.addSuite(this.second);
+    });
+
+    it('does not create a second root suite', function() {
+      expect(this.second.parent, 'to be', this.first);
+      expect(this.first.root, 'to be', true);
+      expect(this.second.root, 'to be', false);
+    });
+
+    it('does not denote the root suite by being titleless', function() {
+      var emptyTitleSuite = Suite.create(this.second, '');
+      expect(emptyTitleSuite.parent, 'to be', this.second);
+      expect(emptyTitleSuite.root, 'to be', false);
+      expect(this.second.root, 'to be', false);
+    });
+  });
+
   describe('.addSuite()', function() {
     beforeEach(function() {
       this.first = new Suite('First suite');
@@ -390,8 +411,8 @@ describe('Suite', function() {
     describe('when there is a parent', function() {
       describe('the parent is the root suite', function() {
         it('returns the suite title', function() {
-          var parentSuite = new Suite('');
-          parentSuite.addSuite(this.suite);
+          var rootSuite = new Suite('', {}, true);
+          rootSuite.addSuite(this.suite);
           expect(this.suite.titlePath(), 'to equal', ['A Suite']);
         });
       });