Support Expectation.identical.

lib/unittest/expectation.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /** This file is sourced by unittest.dart. It defines [Expectation]. */
 
 /**
  * Wraps an value and provides methods that can be used to verify that the value
  * matches a given expectation.
  */
@@ skipping 20 matching lines @@
   /**
    * Asserts that the difference between [expected] and the value is within
    * [tolerance]. If no tolerance is given, it is assumed to be the value 4
    * significant digits smaller than the expected value.
    */
   void approxEquals(num expected,
       [num tolerance = null, String reason = null]) {
     Expect.approxEquals(expected, _value, tolerance: tolerance, reason: reason);
   }
 
+  /**
+   * Asserts that two objects are same (using [:===:]).
+   */
+  void same(expected) {
+    Expect.identical(_value, expected);
+  }
+
   /** Asserts that the value is [null]. */
   void isNull() {
     Expect.equals(null, _value);
   }
 
   /** Asserts that the value is not [null]. */
   void isNotNull() {
     Expect.notEquals(null, _value);
   }
 
@@ skipping 13 matching lines @@
   }
 
   /**
    * Checks that every element of [expected] is also in [actual], and that
    * every element of [actual] is also in [expected].
    */
   void equalsSet(Iterable expected) {
     Expect.setEquals(expected, _value);
   }
 }