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diff --git a/tests/lib/mocha-3.1.2/test/ms.spec.js b/tests/lib/mocha-3.1.2/test/ms.spec.js
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+++ b/tests/lib/mocha-3.1.2/test/ms.spec.js
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+'use strict';
+var ms = require('../lib/ms');
+
+describe('.ms()', function () {
+  // Helpers
+  var time = {
+    minutes: function (n) { return n * 60 * 1000; },
+    hours: function (n) { return n * this.minutes(60); },
+    days: function (n) { return n * this.hours(24); },
+    years: function (n) { return n * this.days(365.25); }
+  };
+  describe('get a value that less than 1 second', function () {
+    it('should return milliseconds representation', function () {
+      ms(200).should.equal('200ms');
+      ms(30).should.equal('30ms');
+      ms(2000).should.not.equal('2000ms');
+    });
+  });
+
+  describe('seconds representation', function () {
+    it('should return short format', function () {
+      ms(2000).should.equal('2s');
+    });
+
+    it('should return long format', function () {
+      ms(2000, { long: true }).should.equal('2 seconds');
+      ms(1000, { long: true }).should.equal('1 second');
+      ms(1010, { long: true }).should.equal('1 second');
+    });
+  });
+
+  describe('minutess representation', function () {
+    it('should return short format', function () {
+      ms(time.minutes(1)).should.equal('1m');
+    });
+
+    it('should return long format', function () {
+      ms(time.minutes(1), { long: true }).should.equal('1 minute');
+      ms(time.minutes(3), { long: true }).should.equal('3 minutes');
+    });
+  });
+
+  describe('hours representation', function () {
+    it('should return short format', function () {
+      ms(time.hours(1)).should.equal('1h');
+    });
+
+    it('should return long format', function () {
+      ms(time.hours(1), { long: true }).should.equal('1 hour');
+      ms(time.hours(3), { long: true }).should.equal('3 hours');
+    });
+  });
+
+  describe('days representation', function () {
+    it('should return short format', function () {
+      ms(time.days(1)).should.equal('1d');
+    });
+
+    it('should return long format', function () {
+      ms(time.days(1), { long: true }).should.equal('1 day');
+      ms(time.days(3), { long: true }).should.equal('3 days');
+    });
+  });
+
+  describe('Getting string value', function () {
+    it('should return the milliseconds representation(Number)', function () {
+      ms('1 second').should.equal(1000);
+
+      ms('1 minute').should.equal(time.minutes(1));
+      ms('6 minutes').should.equal(time.minutes(6));
+
+      ms('1 hour').should.equal(time.hours(1));
+      ms('5 hours').should.equal(time.hours(5));
+
+      ms('1 day').should.equal(time.days(1));
+      ms('3 days').should.equal(time.days(3));
+
+      ms('1 year').should.equal(time.years(1));
+      ms('2 years').should.equal(time.years(2));
+    });
+  });
+});