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 };
+
+TEST(RunningAverageTest, OneElementWindow) {

[alexeypa (please no reviews), 2013/03/18 19:39:39]

nit: Add the case when Record() wasn't called at all.

[Wez, 2013/03/19 23:23:14]

Done.

+  RunningAverage running_average(1);
+  for (size_t i = 0; i < arraysize(kTestValues); ++i) {
+    running_average.Record(kTestValues[i]);
+    EXPECT_EQ(static_cast<double>(kTestValues[i]), running_average.Average());
+  }
+}
+
+TEST(RunningAverageTest, TwoElementWindow) {
+  RunningAverage running_average(2);
+  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());
+  }
+}
+
+// Test that average is across all samples when there are fewer samples than
+// the window size.
+TEST(RunningAverageTest, TenElementWindow) {
+  RunningAverage running_average(10);
+  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;

[alexeypa (please no reviews), 2013/03/18 19:39:39]

nit: i + 1

[Wez, 2013/03/19 23:23:14]

Done.

+
+    EXPECT_EQ(expected, running_average.Average());
+  }
+}
+
+}  // namespace remoting