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diff --git a/tests/lib/mocha-3.1.0/test/grep.spec.js b/tests/lib/mocha-3.1.0/test/grep.spec.js
new file mode 100644
index 0000000000..bbc5c55eba
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+++ b/tests/lib/mocha-3.1.0/test/grep.spec.js
@@ -0,0 +1,65 @@
+var Mocha = require('../');
+
+describe('Mocha', function(){
+  describe('"grep" option', function(){
+    it('should add a RegExp to the mocha.options object', function(){
+      var mocha = new Mocha({ grep: /foo.*/ });
+      mocha.options.grep.toString().should.equal('/foo.*/');
+    });
+
+    it('should convert string to a RegExp', function(){
+      var mocha = new Mocha({ grep: 'foo.*' });
+      mocha.options.grep.toString().should.equal('/foo.*/');
+    });
+  });
+
+  describe('"fgrep" option', function(){
+    it('should escape and convert string to a RegExp', function(){
+      var mocha = new Mocha({ fgrep: 'foo.*' });
+      mocha.options.grep.toString().should.equal('/foo\\.\\*/');
+    });
+  });
+
+  describe('.grep()', function() {
+    // Test helper
+    function testGrep(mocha) {
+      return function testGrep(grep, expected) {
+        mocha.grep(grep);
+        mocha.options.grep.toString().should.equal(expected);
+      }
+    }
+
+    it('should add a RegExp to the mocha.options object', function() {
+      var test = testGrep(new Mocha);
+      test(/foo/, '/foo/');
+    });
+
+    it('should convert grep string to a RegExp', function() {
+      var test = testGrep(new Mocha);
+      test('foo', '/foo/');
+      test('^foo.*bar$', '/^foo.*bar$/');
+      test('^@.*(?=\\(\\)$)', '/^@.*(?=\\(\\)$)/');
+    });
+
+    it('should covert grep regex-like string to a RegExp', function() {
+      var test = testGrep(new Mocha);
+      test('/foo/', '/foo/');
+      // Keep the flags
+      test('/baz/i', '/baz/i');
+      test('/bar/g', '/bar/g');
+      test('/^foo(.*)bar/g', '/^foo(.*)bar/g');
+    });
+
+    it('should return it\'s parent Mocha object for chainability', function(){
+      var mocha = new Mocha;
+      mocha.grep().should.equal(mocha);
+    });
+  });
+
+  describe('"invert" option', function(){
+    it('should add a Boolean to the mocha.options object', function(){
+      var mocha = new Mocha({ invert: true });
+      mocha.options.invert.should.be.ok;
+    });
+  });
+});