Added ability to reset Mocks.

lib/unittest/mock.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.
 
 /**
  * The error formatter for mocking is a bit different from the default one
  * for unit testing; instead of the third argument being a 'reason'
  * it is instead a [signature] describing the method signature filter
  * that was used to select the logs that were verified.
  */
@@ skipping 475 matching lines @@
   }
 
   /**
    *  Find the first log entry that satisfies [logFilter] and
    *  return its position. A search [start] position can be provided
    *  to allow for repeated searches. [logFilter] can be a [CallMatcher],
    *  or a predicate function that takes a [LogEntry] argument and returns
    *  a bool. If [logFilter] is null, it will match any [LogEntry].
    *  If no entry is found, then [failureReturnValue] is returned.
    *  After each check the position is updated by [skip], so using
-   *  [skip] of -1 allows backward searches.
+   *  [skip] of -1 allows backward searches, using a [skip] of 2 can
+   *  be used to check pairs of adjacent entries, and so on.
    */
   int findLogEntry(logFilter, [int start = 0, int failureReturnValue = -1,
       skip = 1]) {
     logFilter = _makePredicate(logFilter);
     int pos = start;
     while (pos >= 0 && pos < logs.length) {
       if (logFilter(logs[pos])) {
         return pos;
       }
       pos += skip;
@@ skipping 921 matching lines @@
                        arg2 = _noArg,
                        arg3 = _noArg,
                        arg4 = _noArg,
                        arg5 = _noArg,
                        arg6 = _noArg,
                        arg7 = _noArg,
                        arg8 = _noArg,
                        arg9 = _noArg]) =>
       getLogs(callsTo(method, arg0, arg1, arg2, arg3, arg4,
           arg5, arg6, arg7, arg8, arg9));
+
+  /** Clear the behaviors for the Mock. */
+  void resetBehavior() => _behaviors.clear();
+
+  /** Clear the logs for the Mock. */
+  void clearLogs() {
+    if (log != null) {
+      if (name == null) { // This log is not shared.
+        log.logs.clear();
+      } else { // This log may be shared.
+        log.logs = log.logs.filter((e) => e.mockName != name);
+      }
+    }
+  }
+
+  /** Clear both logs and behavior. */
+  void reset() {
+    resetBehavior();
+    clearLogs();
+  }
 }