pkg/unittest: Moved `fail` to matcher library

pkg/unittest/lib/src/expect.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;
 
 /** The objects thrown by the default failure handler. */
 class TestFailure {
   String _message;
 
@@ skipping 50 matching lines @@
     }
   }
   if (!doesMatch) {
     if (failureHandler == null) {
       failureHandler = getOrCreateExpectFailureHandler();
     }
     failureHandler.failMatch(actual, matcher, reason, matchState, verbose);
   }
 }
 
+void fail(String message, {FailureHandler failureHandler}) {
+  if (failureHandler == null) {
+    failureHandler = getOrCreateExpectFailureHandler();
+  }
+  failureHandler.fail(message);
+}
+
 /**
  * Takes an argument and returns an equivalent matcher.
  * If the argument is already a matcher this does nothing,
  * else if the argument is a function, it generates a predicate
  * function matcher, else it generates an equals matcher.
  */
 Matcher wrapMatcher(x) {
   if (x is Matcher) {
     return x;
   } else if (x is Function) {
@@ skipping 85 matching lines @@
  * formatter is returned; this allows custom expect handlers to easily
  * get a reference to the default formatter.
  */
 ErrorFormatter configureExpectFormatter([ErrorFormatter formatter = null]) {
   if (formatter == null) {
     formatter = _defaultErrorFormatter;
   }
   return _assertErrorFormatter = formatter;
 }