add string-equals to unittest, fix implementation in expect.dart

client/testing/unittest/shared.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.
 
 /**
  * Description text of the current test group. If multiple groups are nested,
  * this will contain all of their text concatenated.
  */
 String _currentGroup = '';
 
@@ skipping 290 matching lines @@
     Expect.listEquals(expected, _value);
   }
 
   /**
    * 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);
   }
+
+  /**
+   * Asserts that value is equivalent to [expected], assuming both are strings.
+   * When the strings differ, the error highlights the diff between them.
+   */
+  void equalsString(String expected) {

[Bob Nystrom, 2012/02/08 19:17:43]

Why don't we just make the regular equals() handle strings more intelligently?
Why have both?

[Siggi Cherem (dart-lang), 2012/02/08 19:23:51]

Done. I thought that the error message of stringEquals only included the diff. I
just checked that the output actually has the full strings too.

+    Expect.stringEquals(expected, _value);
+  }
 }
 
 /** Summarizes information about a single test case. */
 class TestCase {
   /** Identifier for this test. */
   final id;
 
   /** A description of what the test is specifying. */
   final String description;
 
@@ skipping 33 matching lines @@
   }
 
   void error(String message_, String stackTrace_) {
     result = _ERROR;
     this.message = message_;
     this.stackTrace = stackTrace_;
   }
 }
 
 typedef void TestFunction();