diff --git a/test/unit/mocha.spec.js b/test/unit/mocha.spec.js
index bef492e47f..37b75ffd85 100644
--- a/test/unit/mocha.spec.js
+++ b/test/unit/mocha.spec.js
@@ -37,8 +37,8 @@ describe('Mocha', 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');
+      expect(mocha.files.length).to.equal(1);
+      expect(mocha.files[0]).to.equal('myFile.js');
     });
   });
 
@@ -46,12 +46,12 @@ describe('Mocha', function () {
     it('should set the invert option to true', function () {
       var mocha = new Mocha(blankOpts);
       mocha.invert();
-      mocha.options.invert.should.equal(true);
+      expect(mocha.options.invert).to.equal(true);
     });
 
     it('should be chainable', function () {
       var mocha = new Mocha(blankOpts);
-      mocha.invert().should.equal(mocha);
+      expect(mocha.invert()).to.equal(mocha);
     });
   });
 
@@ -59,24 +59,24 @@ describe('Mocha', 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);
+      expect(mocha.options.ignoreLeaks).to.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);
+      expect(mocha.options.ignoreLeaks).to.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);
+      expect(mocha.options.ignoreLeaks).to.equal(false);
     });
 
     it('should be chainable', function () {
       var mocha = new Mocha(blankOpts);
-      mocha.ignoreLeaks(false).should.equal(mocha);
+      expect(mocha.ignoreLeaks(false)).to.equal(mocha);
     });
   });
 
@@ -84,12 +84,12 @@ describe('Mocha', function () {
     it('should set the ignoreLeaks option to false', function () {
       var mocha = new Mocha(blankOpts);
       mocha.checkLeaks();
-      mocha.options.ignoreLeaks.should.equal(false);
+      expect(mocha.options.ignoreLeaks).to.equal(false);
     });
 
     it('should be chainable', function () {
       var mocha = new Mocha(blankOpts);
-      mocha.checkLeaks().should.equal(mocha);
+      expect(mocha.checkLeaks()).to.equal(mocha);
     });
   });
 
@@ -97,12 +97,12 @@ describe('Mocha', function () {
     it('should set the fullStackTrace option to true', function () {
       var mocha = new Mocha(blankOpts);
       mocha.fullTrace();
-      mocha.options.fullStackTrace.should.equal(true);
+      expect(mocha.options.fullStackTrace).to.equal(true);
     });
 
     it('should be chainable', function () {
       var mocha = new Mocha(blankOpts);
-      mocha.fullTrace().should.equal(mocha);
+      expect(mocha.fullTrace()).to.equal(mocha);
     });
   });
 
@@ -110,12 +110,12 @@ describe('Mocha', function () {
     it('should set the growl option to true', function () {
       var mocha = new Mocha(blankOpts);
       mocha.growl();
-      mocha.options.growl.should.equal(true);
+      expect(mocha.options.growl).to.equal(true);
     });
 
     it('should be chainable', function () {
       var mocha = new Mocha(blankOpts);
-      mocha.growl().should.equal(mocha);
+      expect(mocha.growl()).to.equal(mocha);
     });
   });
 
@@ -123,24 +123,24 @@ describe('Mocha', 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);
+      expect(mocha.options.useInlineDiffs).to.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);
+      expect(mocha.options.useInlineDiffs).to.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);
+      expect(mocha.options.useInlineDiffs).to.equal(false);
     });
 
     it('should be chainable', function () {
       var mocha = new Mocha(blankOpts);
-      mocha.useInlineDiffs().should.equal(mocha);
+      expect(mocha.useInlineDiffs()).to.equal(mocha);
     });
   });
 
@@ -148,7 +148,7 @@ describe('Mocha', function () {
     it('should set the noHighlighting option to true', function () {
       var mocha = new Mocha(blankOpts);
       mocha.noHighlighting();
-      mocha.options.noHighlighting.should.equal(true);
+      expect(mocha.options.noHighlighting).to.equal(true);
     });
   });
 
@@ -156,7 +156,7 @@ describe('Mocha', function () {
     it('should set the allowUncaught option to true', function () {
       var mocha = new Mocha(blankOpts);
       mocha.allowUncaught();
-      mocha.options.allowUncaught.should.equal(true);
+      expect(mocha.options.allowUncaught).to.equal(true);
     });
   });
 
@@ -164,7 +164,7 @@ describe('Mocha', function () {
     it('should set the delay option to true', function () {
       var mocha = new Mocha(blankOpts);
       mocha.delay();
-      mocha.options.delay.should.equal(true);
+      expect(mocha.options.delay).to.equal(true);
     });
   });
 });