old_contents: 
  /*!
   * Module dependencies.
   *
   * Chai is automatically included in the browser.
   */
  
  if (!chai) {
    var chai = require('..');
  }
  
  var assert = chai.assert;
  
  function err(fn, msg) {
    try {
      fn();
      chai.fail('expected an error');
    } catch (err) {
      assert.equal(msg, err.message);
    }
  }
  
  suite('assert', function () {
  
    test('version', function () {
      assert.match(chai.version, /^\d+\.\d+\.\d+$/ );
    });
  
    test('isTrue', function () {
      assert.isTrue(true);
  
      err(function() {
        assert.isTrue(false);
      }, "expected false to be true");
  
      err(function() {
        assert.isTrue(1);
      }, "expected 1 to be true");
  
      err(function() {
        assert.isTrue('test');
      }, "expected 'test' to be true");
    });
  
    test('ok', function () {
      assert.ok(true);
      assert.ok(1);
      assert.ok('test');
  
      err(function () {
        assert.ok(false);
      }, "expected false to be truthy");
  
      err(function () {
        assert.ok(0);
      }, "expected 0 to be truthy");
  
      err(function () {
        assert.ok('');
      }, "expected '' to be truthy");
    });
  
    test('isFalse', function () {
      assert.isFalse(false);
  
      err(function() {
        assert.isFalse(true);
      }, "expected true to be false");
  
      err(function() {
        assert.isFalse(0);
      }, "expected 0 to be false");
    });
  
    test('equal', function () {
      var foo;
      assert.equal(foo, undefined);
    });
  
    test('typeof', function () {
      assert.typeOf('test', 'string');
      assert.typeOf(true, 'boolean');
      assert.typeOf(5, 'number');
  
      err(function () {
        assert.typeOf(5, 'string');
      }, "expected 5 to be a string");
    });
  
    test('instanceOf', function() {
      function Foo(){}
      assert.instanceOf(new Foo(), Foo);
  
      err(function () {
        assert.instanceOf(5, Foo);
      }, "expected 5 to be an instance of Foo");
    });
  
    test('isObject', function () {
      function Foo(){}
      assert.isObject({});
      assert.isObject(new Foo());
  
      err(function() {
        assert.isObject(true);
      }, "expected true to be a object");
  
      err(function() {
        assert.isObject(Foo);
      }, "expected [Function: Foo] to be a object");
  
      err(function() {
        assert.isObject('foo');
      }, "expected 'foo' to be a object");
    });
  
  });
  
new_contents: 
  /*!
   * Module dependencies.
   *
   * Chai is automatically included in the browser.
   */
  
  if (!chai) {
    var chai = require('..');
  }
  
  var assert = chai.assert;
  
  function err(fn, msg) {
    try {
      fn();
      chai.fail('expected an error');
    } catch (err) {
      assert.equal(msg, err.message);
    }
  }
  
  suite('assert', function () {
  
    test('version', function () {
      assert.match(chai.version, /^\d+\.\d+\.\d+$/ );
    });
  
    test('isTrue', function () {
      assert.isTrue(true);
  
      err(function() {
        assert.isTrue(false);
      }, "expected false to be true");
  
      err(function() {
        assert.isTrue(1);
      }, "expected 1 to be true");
  
      err(function() {
        assert.isTrue('test');
      }, "expected 'test' to be true");
    });
  
    test('ok', function () {
      assert.ok(true);
      assert.ok(1);
      assert.ok('test');
  
      err(function () {
        assert.ok(false);
      }, "expected false to be truthy");
  
      err(function () {
        assert.ok(0);
      }, "expected 0 to be truthy");
  
      err(function () {
        assert.ok('');
      }, "expected '' to be truthy");
    });
  
    test('isFalse', function () {
      assert.isFalse(false);
  
      err(function() {
        assert.isFalse(true);
      }, "expected true to be false");
  
      err(function() {
        assert.isFalse(0);
      }, "expected 0 to be false");
    });
  
    test('equal', function () {
      var foo;
      assert.equal(foo, undefined);
    });
  
    test('typeof', function () {
      assert.typeOf('test', 'string');
      assert.typeOf(true, 'boolean');
      assert.typeOf(5, 'number');
  
      err(function () {
        assert.typeOf(5, 'string');
      }, "expected 5 to be a string");
    });
  
    test('instanceOf', function() {
      function Foo(){}
      assert.instanceOf(new Foo(), Foo);
  
      err(function () {
        assert.instanceOf(5, Foo);
      }, "expected 5 to be an instance of Foo");
    });
  
    test('isObject', function () {
      function Foo(){}
      assert.isObject({});
      assert.isObject(new Foo());
  
      err(function() {
        assert.isObject(true);
      }, "expected true to be a object");
  
      err(function() {
        assert.isObject(Foo);
      }, "expected [Function: Foo] to be a object");
  
      err(function() {
        assert.isObject('foo');
      }, "expected 'foo' to be a object");
    });
  
    test('notEqual', function() {
      assert.notEqual(3, 4);
  
      err(function () {
        assert.notEqual(5, 5);
      }, "expected 5 to equal 5");
    });
  
  });
  
subject: Add test for `assert.notEqual`.