First prototype of import map generator.

corelib/src/expect.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.
 
 class Expect {
 
   /**
    * Checks whether the expected and actual values are equal (using [:==:]).
    */
   static void equals(var expected, var actual, [String reason = null]) {
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     }
     // We check on length at the end in order to provide better error
     // messages when an unexpected item is inserted in a list.
     if (expected.length != actual.length) {
       _fail('Expect.listEquals(list length, ' +
         'expected: <${expected.length}>, actual: <${actual.length}>$msg) ' +
         'fails');
     }
   }
 
+  /**
+   * Checks that all [expected] and [actual] have the same set of keys (using
+   * the semantics of [Map.containsKey] to determine what "same" means. For
+   * each key, checks that the values in both maps are equal using [:==:].
+   */
+  static void mapEquals(Map expected, Map actual, [String reason = null]) {
+    String msg = _getMessage(reason);
+
+    // Make sure all of the values are present in both and match.
+    for (final key in expected.getKeys()) {
+      if (!actual.containsKey(key)) {
+        _fail('Expect.mapEquals(missing expected key: <$key>$msg) fails');
+      }
+
+      Expect.equals(expected[key], actual[key]);
+    }
+
+    // Make sure the actual map doesn't have any extra keys.
+    for (final key in actual.getKeys()) {
+      if (!expected.containsKey(key)) {
+        _fail('Expect.mapEquals(unexpected key: <$key>$msg) fails');
+      }
+    }
+  }
 
   /**
    * Specialized equality test for strings. When the strings don't match,
    * this method shows where the mismatch starts and ends.
    */
   static void stringEquals(String expected,
                            String actual,
                            [String reason = null]) {
     String msg = _getMessage(reason);
     String defaultMessage =
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   }
 }
 
 typedef bool _CheckExceptionFn(exception);
 
 class ExpectException implements Exception {
   ExpectException(this.message);
   String toString() => message;
   String message;
 }