Add unit tests for sub-components of CaptureScheduler.

remoting/base/running_average_unittest.cc

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "remoting/base/running_average.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace remoting {
+
+static const int64 kTestValues[] = { 10, 20, 30, 10, 25, 16, 15 };
+
+// Average across a single element, i.e. just return the most recent.
+TEST(RunningAverageTest, OneElementWindow) {
+  RunningAverage running_average(1);
+  EXPECT_EQ(0, running_average.Average());
+
+  for (size_t i = 0; i < arraysize(kTestValues); ++i) {
+    running_average.Record(kTestValues[i]);
+    EXPECT_EQ(static_cast<double>(kTestValues[i]), running_average.Average());
+  }
+}
+
+// Average the two most recent elements.
+TEST(RunningAverageTest, TwoElementWindow) {
+  RunningAverage running_average(2);
+  EXPECT_EQ(0, running_average.Average());
+
+  for (size_t i = 0; i < arraysize(kTestValues); ++i) {
+    running_average.Record(kTestValues[i]);
+
+    double expected = kTestValues[i];
+    if (i > 0)
+      expected = (expected + kTestValues[i-1]) / 2;
+
+    EXPECT_EQ(expected, running_average.Average());
+  }
+}
+
+// Average across all the elements if the window size exceeds the element count.
+TEST(RunningAverageTest, LongWindow) {
+  RunningAverage running_average(arraysize(kTestValues) + 1);
+  EXPECT_EQ(0, running_average.Average());
+
+  for (size_t i = 0; i < arraysize(kTestValues); ++i) {
+    running_average.Record(kTestValues[i]);
+
+    double expected = 0.0;
+    for (size_t j = 0; j <= i; ++j)
+      expected += kTestValues[j];
+    expected /= i + 1;
+
+    EXPECT_EQ(expected, running_average.Average());
+  }
+}
+
+}  // namespace remoting