Modified unittest to use new argument syntax.

pkg/unittest/expect.dart

Index: pkg/unittest/expect.dart
===================================================================
--- pkg/unittest/expect.dart	(revision 14156)
+++ pkg/unittest/expect.dart	(working copy)
@@ -2,14 +2,13 @@
 // 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 unittest;
+
 /**
  * This is the main assertion function. It asserts that [actual]
- * matches the [matcher]. [matcher] is optional and defaults to isTrue,
- * so expect can be used with a single predicate argument. [reason]
- * is optional and is typically not supplied if a reasonable matcher is
- * explicitly provided, as a reason can be generated from the matcher.
- * If [reason] is included it is appended to the reason generated
- * by the matcher.
+ * matches the [matcher]. [reason] is optional and is typically not
+ * supplied, as a reason is generated from the matcher; if [reason]
+ * is included it is appended to the reason generated by the matcher.
  *
  * [matcher] can be a value in which case it will be wrapped in an
  * [equals] matcher.
@@ -33,9 +32,8 @@
  *     [Hamcrest] http://code.google.com/p/hamcrest/
  *     [dart-matchers] https://github.com/Ladicek/dart-matchers
  */
-void expect(actual, [matcher = isTrue, String reason = null,
-            FailureHandler failureHandler = null,
-            bool verbose = false]) {
+void expect(actual, matcher, {String reason, FailureHandler failureHandler,
+            bool verbose : false}) {
   matcher = wrapMatcher(matcher);
   bool doesMatch;
   var matchState = new MatchState();