Get touch tests working at all, and with new API.

client/testing/unittest/unittestsuite.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.
 
 // TODO(rnystrom): This code is gradually moving from a Java/JUnit style to
 // something closer to JS/Jasmine. Eventually, the UnitTestSuite class can go
 // away completely (or become private to this library) and the only exposed API
 // will be group()/test()/expect(). Until then, both ways are supported, which
 // is why things look a bit weird in here.
 
@@ skipping 340 matching lines @@
 
 /**
  * Wraps an value and provides an "==" operator that can be used to verify that
  * the value matches a given expectation.
  */
 class Expectation {
   final _value;
 
   Expectation(this._value);
 
-  // TODO(rnystrom): Get rid of this and use .equals(). After some discussion,
-  // we decided this is the wrong approach for a bunch of reasons, clever as it
-  // may be.
   /** Asserts that the value is equivalent to the given expected value. */
-  bool equals(expected) {
+  void equals(expected) {
     Expect.equals(expected, _value);
-    return _value == expected;
+  }
+
+  /**
+   * Failure if the difference between expected and actual is greater than the
+   * given tolerance. If no tolerance is given, tolerance is assumed to be the
+   * value 4 significant digits smaller than the value given for expected.
+   */
+  void approxEquals(num expected,
+      [num tolerance = null, String reason = null]) {
+    Expect.approxEquals(expected, _value, tolerance: tolerance, reason: reason);
   }
 
   /** 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 130 matching lines @@
         </tr>""";
     if (stackTrace != null) {
       message +=
           "<tr><td></td><td colspan='2'><pre>${stackTrace}</pre></td></tr>";
     }
     fail = true;
   }
 }
 
 typedef void TestFunction();