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diff --git a/tests/lib/mocha-3.1.2/test/integration/fixtures/diffs/diffs.fixture.js b/tests/lib/mocha-3.1.2/test/integration/fixtures/diffs/diffs.fixture.js
new file mode 100644
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+++ b/tests/lib/mocha-3.1.2/test/integration/fixtures/diffs/diffs.fixture.js
@@ -0,0 +1,113 @@
+'use strict';
+
+var fs = require('fs');
+var cssin = fs.readFileSync('test/integration/fixtures/diffs/diffs.css.in', 'ascii');
+var cssout = fs.readFileSync('test/integration/fixtures/diffs/diffs.css.out', 'ascii');
+
+describe('diffs', function () {
+  var actual, expected;
+
+  it('should display a diff for small strings', function () {
+    actual = 'foo rar baz';
+    expected = 'foo bar baz';
+    actual.should.equal(expected);
+  });
+
+  it('should display a diff of canonicalized objects', function () {
+    actual = { name: 'travis j', age: 23 };
+    expected = { age: 23, name: 'travis' };
+    actual.should.equal(expected);
+  });
+
+  it('should display a diff for medium strings', function () {
+    actual = 'foo bar baz\nfoo rar baz\nfoo bar raz';
+    expected = 'foo bar baz\nfoo bar baz\nfoo bar baz';
+    actual.should.equal(expected);
+  });
+
+  it('should display a diff for entire object dumps', function () {
+    actual = {
+      name: 'joel',
+      age: 30,
+      address: {
+        city: 'new york',
+        country: 'usa'
+      }
+    };
+    expected = {
+      name: 'joe',
+      age: 30,
+      address: {
+        city: 'new york',
+        country: 'us'
+      }
+    };
+    actual.should.equal(expected);
+  });
+
+  it('should display a diff for multi-line strings', function () {
+    actual = 'one two three\nfour zzzz six\nseven eight nine';
+    expected = 'one two three\nfour five six\nseven eight nine';
+    actual.should.equal(expected);
+  });
+
+  it('should display a diff for entire object dumps', function () {
+    actual = {
+      name: 'joel',
+      age: 30,
+      address: {
+        city: 'new york',
+        country: 'usa'
+      }
+    };
+    expected = {
+      name: 'joe',
+      age: 30,
+      address: {
+        city: 'new york',
+        country: 'us'
+      }
+    };
+    actual.should.equal(expected);
+  });
+
+  it('should display a full-comparison with escaped special characters', function () {
+    actual = 'one\ttab\ntwo\t\t\ttabs';
+    expected = 'one\ttab\ntwo\t\ttabs';
+    actual.should.equal(expected);
+  });
+
+  it('should display a word diff for large strings', function () {
+    cssin.should.equal(cssout);
+  });
+
+  it('should work with objects', function () {
+    actual = {
+      name: 'tobi',
+      species: 'ferret',
+      color: 'white',
+      age: 2
+    };
+
+    expected = {
+      name: 'loki',
+      species: 'ferret',
+      color: 'brown',
+      age: 2
+    };
+
+    actual.should.eql(expected);
+  });
+
+  it('should show value diffs and not be affected by commas', function () {
+    actual = { a: 123 };
+    expected = { a: 123, b: 456 };
+    actual.should.equal(expected);
+  });
+
+  it('should display diff by data and not like an objects', function () {
+    actual = new Buffer([0x01]);
+    expected = new Buffer([0x02]);
+    actual.should.equal(expected);
+  });
+});