diff --git a/lib/utils.js b/lib/utils.js
index 6ab1277409..56b9d63c48 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -63,8 +63,9 @@ exports.isString = function(obj) {
 exports.slug = function(str) {
   return str
     .toLowerCase()
-    .replace(/ +/g, '-')
-    .replace(/[^-\w]/g, '');
+    .replace(/\s+/g, '-')
+    .replace(/[^-\w]/g, '')
+    .replace(/-{2,}/g, '-');
 };
 
 /**
diff --git a/test/unit/mocha.spec.js b/test/unit/mocha.spec.js
index c676d5f96b..219564d3aa 100644
--- a/test/unit/mocha.spec.js
+++ b/test/unit/mocha.spec.js
@@ -17,9 +17,16 @@ describe('Mocha', function() {
   });
 
   describe('constructor', function() {
+    var mocha;
+
     beforeEach(function() {
+      mocha = sandbox.createStubInstance(Mocha);
+      mocha.timeout.returnsThis();
+      mocha.retries.returnsThis();
       sandbox.stub(Mocha.prototype, 'timeout').returnsThis();
       sandbox.stub(Mocha.prototype, 'global').returnsThis();
+      sandbox.stub(Mocha.prototype, 'retries').returnsThis();
+      sandbox.stub(Mocha.prototype, 'rootHooks').returnsThis();
     });
 
     it('should set _cleanReferencesAfterRun to true', function() {
@@ -34,8 +41,8 @@ describe('Mocha', function() {
       });
     });
 
-    describe('when "options.timeout" is `false`', function() {
-      it('should set a timeout of 0', function() {
+    describe('when `timeout` option is `false`', function() {
+      it('should attempt to set timeout', function() {
         // eslint-disable-next-line no-new
         new Mocha({timeout: false});
         expect(Mocha.prototype.timeout, 'to have a call satisfying', [0]).and(
@@ -44,8 +51,8 @@ describe('Mocha', function() {
       });
     });
 
-    describe('when "options.global" is provided', function() {
-      it('should pass "options.global" to #global()', function() {
+    describe('when `global` option is an `Array`', function() {
+      it('should attempt to set globals', function() {
         // eslint-disable-next-line no-new
         new Mocha({global: ['singular']});
         expect(Mocha.prototype.global, 'to have a call satisfying', [
@@ -53,6 +60,34 @@ describe('Mocha', function() {
         ]).and('was called once');
       });
     });
+
+    describe('when `retries` option is present', function() {
+      it('should attempt to set retries`', function() {
+        // eslint-disable-next-line no-new
+        new Mocha({retries: 1});
+        expect(Mocha.prototype.retries, 'to have a call satisfying', [1]).and(
+          'was called once'
+        );
+      });
+    });
+
+    describe('when `retries` option is not present', function() {
+      it('should not attempt to set retries', function() {
+        // eslint-disable-next-line no-new
+        new Mocha({});
+        expect(Mocha.prototype.retries, 'was not called');
+      });
+    });
+
+    describe('when `rootHooks` option is truthy', function() {
+      it('shouid attempt to set root hooks', function() {
+        // eslint-disable-next-line no-new
+        new Mocha({rootHooks: ['a root hook']});
+        expect(Mocha.prototype.rootHooks, 'to have a call satisfying', [
+          ['a root hook']
+        ]).and('was called once');
+      });
+    });
   });
 
   describe('#allowUncaught()', function() {
diff --git a/test/unit/utils.spec.js b/test/unit/utils.spec.js
index 3c68ddd186..a54535b1a5 100644
--- a/test/unit/utils.spec.js
+++ b/test/unit/utils.spec.js
@@ -14,7 +14,7 @@ describe('lib/utils', function() {
     sandbox.restore();
   });
 
-  describe('clean', function() {
+  describe('clean()', function() {
     it('should remove the wrapping function declaration', function() {
       expect(
         utils.clean('function  (one, two, three)  {\n//code\n}'),
@@ -149,7 +149,7 @@ describe('lib/utils', function() {
     });
   });
 
-  describe('stringify', function() {
+  describe('stringify()', function() {
     var stringify = utils.stringify;
 
     it('should return an object representation of a string created with a String constructor', function() {
@@ -525,7 +525,7 @@ describe('lib/utils', function() {
     });
   });
 
-  describe('type', function() {
+  describe('type()', function() {
     /* eslint no-extend-native: off */
 
     var type = utils.type;
@@ -588,7 +588,7 @@ describe('lib/utils', function() {
     });
   });
 
-  describe('isPromise', function() {
+  describe('isPromise()', function() {
     it('should return true if the value is Promise-ish', function() {
       expect(
         utils.isPromise({
@@ -612,7 +612,7 @@ describe('lib/utils', function() {
     });
   });
 
-  describe('escape', function() {
+  describe('escape()', function() {
     it('replaces the usual xml suspects', function() {
       expect(utils.escape('<a<bc<d<'), 'to be', '&#x3C;a&#x3C;bc&#x3C;d&#x3C;');
       expect(utils.escape('>a>bc>d>'), 'to be', '&#x3E;a&#x3E;bc&#x3E;d&#x3E;');
@@ -634,7 +634,7 @@ describe('lib/utils', function() {
     });
   });
 
-  describe('deprecate', function() {
+  describe('deprecate()', function() {
     var emitWarning;
 
     beforeEach(function() {
@@ -674,7 +674,7 @@ describe('lib/utils', function() {
     });
   });
 
-  describe('warn', function() {
+  describe('warn()', function() {
     var emitWarning;
 
     beforeEach(function() {
@@ -710,13 +710,17 @@ describe('lib/utils', function() {
     });
   });
 
-  describe('sQuote/dQuote', function() {
+  describe('sQuote()', function() {
     var str = 'xxx';
 
     it('should return its input as string wrapped in single quotes', function() {
       var expected = "'xxx'";
       expect(utils.sQuote(str), 'to be', expected);
     });
+  });
+
+  describe('dQuote()', function() {
+    var str = 'xxx';
 
     it('should return its input as string wrapped in double quotes', function() {
       var expected = '"xxx"';
@@ -724,7 +728,7 @@ describe('lib/utils', function() {
     });
   });
 
-  describe('createMap', function() {
+  describe('createMap()', function() {
     it('should return an object with a null prototype', function() {
       expect(Object.getPrototypeOf(utils.createMap()), 'to be', null);
     });
@@ -743,4 +747,26 @@ describe('lib/utils', function() {
       );
     });
   });
+
+  describe('slug()', function() {
+    it('should convert the string to lowercase', function() {
+      expect(utils.slug('FOO'), 'to be', 'foo');
+    });
+
+    it('should convert whitespace to dashes', function() {
+      expect(
+        utils.slug('peanut butter\nand\tjelly'),
+        'to be',
+        'peanut-butter-and-jelly'
+      );
+    });
+
+    it('should strip non-alphanumeric and non-dash characters', function() {
+      expect(utils.slug('murder-hornets!!'), 'to be', 'murder-hornets');
+    });
+
+    it('should disallow consecutive dashes', function() {
+      expect(utils.slug('poppies & fritz'), 'to be', 'poppies-fritz');
+    });
+  });
 });