Adding a first simple version of overuse detection, but not hooked up.

BUG=
R=asapersson@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1717004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@4268 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/video_engine/overuse_frame_detector_unittest.cc b/video_engine/overuse_frame_detector_unittest.cc
new file mode 100644
index 0000000..383f80f
--- /dev/null
+++ b/video_engine/overuse_frame_detector_unittest.cc
@@ -0,0 +1,66 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+#include "webrtc/system_wrappers/interface/clock.h"
+#include "webrtc/system_wrappers/interface/scoped_ptr.h"
+#include "webrtc/video_engine/overuse_frame_detector.h"
+
+using ::testing::_;
+using ::testing::AnyNumber;
+using ::testing::Return;
+
+namespace webrtc {
+
+const int kProcessIntervalMs = 2000;
+
+class MockOveruseObserver : public OveruseObserver {
+ public:
+  MockOveruseObserver() {}
+  virtual ~MockOveruseObserver() {}
+
+  MOCK_METHOD0(OveruseDetected, void());
+};
+
+class OveruseFrameDetectorTest : public ::testing::Test {
+ protected:
+  virtual void SetUp() {
+    clock_.reset(new SimulatedClock(1234));
+    observer_.reset(new MockOveruseObserver());
+    overuse_detector_.reset(new OveruseFrameDetector(clock_.get(),
+                                                     observer_.get()));
+  }
+  scoped_ptr<SimulatedClock> clock_;
+  scoped_ptr<MockOveruseObserver> observer_;
+  scoped_ptr<OveruseFrameDetector> overuse_detector_;
+};
+
+TEST_F(OveruseFrameDetectorTest, TriggerOveruse) {
+  EXPECT_EQ(overuse_detector_->TimeUntilNextProcess(), kProcessIntervalMs);
+  overuse_detector_->CapturedFrame();
+  overuse_detector_->EncodedFrame();
+  clock_->AdvanceTimeMilliseconds(kProcessIntervalMs);
+  EXPECT_CALL(*(observer_.get()), OveruseDetected()).Times(0);
+  overuse_detector_->Process();
+
+  overuse_detector_->CapturedFrame();
+  clock_->AdvanceTimeMilliseconds(kProcessIntervalMs);
+  EXPECT_CALL(*(observer_.get()), OveruseDetected()).Times(1);
+  overuse_detector_->Process();
+
+  clock_->AdvanceTimeMilliseconds(5000);
+  overuse_detector_->CapturedFrame();
+  overuse_detector_->EncodedFrame();
+  EXPECT_CALL(*(observer_.get()), OveruseDetected()).Times(0);
+  overuse_detector_->Process();
+}
+}  // namespace webrtc