Added ability to reset Mocks.

Review URL: https://chromiumcodereview.appspot.com//10855128

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@10588 260f80e4-7a28-3924-810f-c04153c831b5

lib/unittest/mock.dart

@@ -493,7 +493,8 @@ class LogEntryList {
    *  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]) {
@@ -1435,4 +1436,24 @@ class Mock {
                        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();
+  }
 }

tests/lib/unittest/mock_test.dart

@@ -602,4 +602,35 @@ main() {
     });
     expect(total, equals((0 * 1) + (2 * 3) + (4 * 5) + (6 * 7) + (8 * 9))); 
   });
+
+  test('Mocking: clearLogs', () {
+    var m = new Mock();
+    m.foo();
+    m.foo();
+    m.foo();
+    expect(m.log.logs, hasLength(3));
+    m.clearLogs();
+    expect(m.log.logs, hasLength(0));
+    LogEntryList log = new LogEntryList();
+    var m1 = new Mock.custom(name: 'm1', log: log);
+    var m2 = new Mock.custom(name: 'm2', log: log);
+    var m3 = new Mock.custom(name: 'm3', log: log);
+    for (var i = 0; i < 3; i++) {
+      m1.foo();
+      m2.bar();
+      m3.pow();
+    }
+    expect(log.logs, hasLength(9));
+    m1.clearLogs();
+    expect(log.logs, hasLength(6));
+    m1.clearLogs();
+    expect(log.logs, hasLength(6));
+    expect(log.logs.every((e) => e.mockName == 'm2' || e.mockName == 'm3'),
+        isTrue);
+    m2.clearLogs();
+    expect(log.logs, hasLength(3));
+    expect(log.logs.every((e) => e.mockName =='m3'), isTrue);
+    m3.clearLogs();
+    expect(log.logs, hasLength(0));
+  });
 }