Improved error messages from unittest.

pkg/unittest/lib/src/string_matchers.dart

 // Copyright (c) 2012, 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.
 
 part of matcher;
 
 /**
  * Returns a matcher which matches if the match argument is a string and
  * is equal to [value] when compared case-insensitively.
  */
@@ skipping 35 matching lines @@
 
   bool matches(item, MatchState matchState) =>
       item is String && _matchValue == collapseWhitespace(item);
 
   Description describe(Description description) =>
     description.addDescriptionOf(_matchValue).add(' ignoring whitespace');
 
   Description describeMismatch(item, Description mismatchDescription,
                                MatchState matchState, bool verbose) {
     if (item is String) {
-      return mismatchDescription.add('was ').
-          addDescriptionOf(collapseWhitespace(item));
+      return mismatchDescription.add('is ').
+          addDescriptionOf(collapseWhitespace(item)).
+          add(' with whitespace compressed');
     } else {
       return super.describeMismatch(item, mismatchDescription,
           matchState, verbose);
     }
   }
 }
 
 /**
  * Utility function to collapse whitespace runs to single spaces
  * and strip leading/trailing whitespace.
@@ skipping 126 matching lines @@
     if (!(item is String)) {
       return mismatchDescription.
           addDescriptionOf(item).
           add(' not a string');
     } else {
       return super.describeMismatch(item, mismatchDescription,
           matchState, verbose);
     }
   }
 }