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-rw-r--r--third_party/libwebrtc/modules/video_coding/histogram_unittest.cc77
1 files changed, 77 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/video_coding/histogram_unittest.cc b/third_party/libwebrtc/modules/video_coding/histogram_unittest.cc
new file mode 100644
index 0000000000..3690a39398
--- /dev/null
+++ b/third_party/libwebrtc/modules/video_coding/histogram_unittest.cc
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2016 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 "modules/video_coding/histogram.h"
+
+#include "test/gtest.h"
+
+namespace webrtc {
+namespace video_coding {
+
+class TestHistogram : public ::testing::Test {
+ protected:
+ TestHistogram() : histogram_(5, 10) {}
+ Histogram histogram_;
+};
+
+TEST_F(TestHistogram, NumValues) {
+ EXPECT_EQ(0ul, histogram_.NumValues());
+ histogram_.Add(0);
+ EXPECT_EQ(1ul, histogram_.NumValues());
+}
+
+TEST_F(TestHistogram, InverseCdf) {
+ histogram_.Add(0);
+ histogram_.Add(1);
+ histogram_.Add(2);
+ histogram_.Add(3);
+ histogram_.Add(4);
+ EXPECT_EQ(5ul, histogram_.NumValues());
+ EXPECT_EQ(1ul, histogram_.InverseCdf(0.2f));
+ EXPECT_EQ(2ul, histogram_.InverseCdf(0.2000001f));
+ EXPECT_EQ(4ul, histogram_.InverseCdf(0.8f));
+
+ histogram_.Add(0);
+ EXPECT_EQ(6ul, histogram_.NumValues());
+ EXPECT_EQ(1ul, histogram_.InverseCdf(0.2f));
+ EXPECT_EQ(1ul, histogram_.InverseCdf(0.2000001f));
+}
+
+TEST_F(TestHistogram, ReplaceOldValues) {
+ histogram_.Add(0);
+ histogram_.Add(0);
+ histogram_.Add(0);
+ histogram_.Add(0);
+ histogram_.Add(0);
+ histogram_.Add(1);
+ histogram_.Add(1);
+ histogram_.Add(1);
+ histogram_.Add(1);
+ histogram_.Add(1);
+ EXPECT_EQ(10ul, histogram_.NumValues());
+ EXPECT_EQ(1ul, histogram_.InverseCdf(0.5f));
+ EXPECT_EQ(2ul, histogram_.InverseCdf(0.5000001f));
+
+ histogram_.Add(4);
+ histogram_.Add(4);
+ histogram_.Add(4);
+ histogram_.Add(4);
+ EXPECT_EQ(10ul, histogram_.NumValues());
+ EXPECT_EQ(1ul, histogram_.InverseCdf(0.1f));
+ EXPECT_EQ(2ul, histogram_.InverseCdf(0.5f));
+
+ histogram_.Add(20);
+ EXPECT_EQ(10ul, histogram_.NumValues());
+ EXPECT_EQ(2ul, histogram_.InverseCdf(0.5f));
+ EXPECT_EQ(5ul, histogram_.InverseCdf(0.5000001f));
+}
+
+} // namespace video_coding
+} // namespace webrtc