diff --git a/test/unit/mocha.spec.js b/test/unit/mocha.spec.js
index 8f3b6eefb8..bef492e47f 100644
--- a/test/unit/mocha.spec.js
+++ b/test/unit/mocha.spec.js
@@ -32,4 +32,139 @@ describe('Mocha', function () {
       });
     });
   });
+
+  describe('.addFile()', function () {
+    it('should add the given file to the files array', function () {
+      var mocha = new Mocha(blankOpts);
+      mocha.addFile('myFile.js');
+      mocha.files.length.should.equal(1);
+      mocha.files[0].should.equal('myFile.js');
+    });
+  });
+
+  describe('.invert()', function () {
+    it('should set the invert option to true', function () {
+      var mocha = new Mocha(blankOpts);
+      mocha.invert();
+      mocha.options.invert.should.equal(true);
+    });
+
+    it('should be chainable', function () {
+      var mocha = new Mocha(blankOpts);
+      mocha.invert().should.equal(mocha);
+    });
+  });
+
+  describe('.ignoreLeaks()', function () {
+    it('should set the ignoreLeaks option to true when param equals true', function () {
+      var mocha = new Mocha(blankOpts);
+      mocha.ignoreLeaks(true);
+      mocha.options.ignoreLeaks.should.equal(true);
+    });
+
+    it('should set the ignoreLeaks option to false when param equals false', function () {
+      var mocha = new Mocha(blankOpts);
+      mocha.ignoreLeaks(false);
+      mocha.options.ignoreLeaks.should.equal(false);
+    });
+
+    it('should set the ignoreLeaks option to false when the param is undefined', function () {
+      var mocha = new Mocha(blankOpts);
+      mocha.ignoreLeaks();
+      mocha.options.ignoreLeaks.should.equal(false);
+    });
+
+    it('should be chainable', function () {
+      var mocha = new Mocha(blankOpts);
+      mocha.ignoreLeaks(false).should.equal(mocha);
+    });
+  });
+
+  describe('.checkLeaks()', function () {
+    it('should set the ignoreLeaks option to false', function () {
+      var mocha = new Mocha(blankOpts);
+      mocha.checkLeaks();
+      mocha.options.ignoreLeaks.should.equal(false);
+    });
+
+    it('should be chainable', function () {
+      var mocha = new Mocha(blankOpts);
+      mocha.checkLeaks().should.equal(mocha);
+    });
+  });
+
+  describe('.fullTrace()', function () {
+    it('should set the fullStackTrace option to true', function () {
+      var mocha = new Mocha(blankOpts);
+      mocha.fullTrace();
+      mocha.options.fullStackTrace.should.equal(true);
+    });
+
+    it('should be chainable', function () {
+      var mocha = new Mocha(blankOpts);
+      mocha.fullTrace().should.equal(mocha);
+    });
+  });
+
+  describe('.growl()', function () {
+    it('should set the growl option to true', function () {
+      var mocha = new Mocha(blankOpts);
+      mocha.growl();
+      mocha.options.growl.should.equal(true);
+    });
+
+    it('should be chainable', function () {
+      var mocha = new Mocha(blankOpts);
+      mocha.growl().should.equal(mocha);
+    });
+  });
+
+  describe('.useInlineDiffs()', function () {
+    it('should set the useInlineDiffs option to true when param equals true', function () {
+      var mocha = new Mocha(blankOpts);
+      mocha.useInlineDiffs(true);
+      mocha.options.useInlineDiffs.should.equal(true);
+    });
+
+    it('should set the useInlineDiffs option to false when param equals false', function () {
+      var mocha = new Mocha(blankOpts);
+      mocha.useInlineDiffs(false);
+      mocha.options.useInlineDiffs.should.equal(false);
+    });
+
+    it('should set the useInlineDiffs option to false when the param is undefined', function () {
+      var mocha = new Mocha(blankOpts);
+      mocha.useInlineDiffs();
+      mocha.options.useInlineDiffs.should.equal(false);
+    });
+
+    it('should be chainable', function () {
+      var mocha = new Mocha(blankOpts);
+      mocha.useInlineDiffs().should.equal(mocha);
+    });
+  });
+
+  describe('.noHighlighting()', function () {
+    it('should set the noHighlighting option to true', function () {
+      var mocha = new Mocha(blankOpts);
+      mocha.noHighlighting();
+      mocha.options.noHighlighting.should.equal(true);
+    });
+  });
+
+  describe('.allowUncaught()', function () {
+    it('should set the allowUncaught option to true', function () {
+      var mocha = new Mocha(blankOpts);
+      mocha.allowUncaught();
+      mocha.options.allowUncaught.should.equal(true);
+    });
+  });
+
+  describe('.delay()', function () {
+    it('should set the delay option to true', function () {
+      var mocha = new Mocha(blankOpts);
+      mocha.delay();
+      mocha.options.delay.should.equal(true);
+    });
+  });
 });