Index: webrtc/base/exp_filter_unittest.cc |
diff --git a/webrtc/base/exp_filter_unittest.cc b/webrtc/base/exp_filter_unittest.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..f0278081138edd9005275c313065a20ef4e94bbe |
--- /dev/null |
+++ b/webrtc/base/exp_filter_unittest.cc |
@@ -0,0 +1,71 @@ |
+/* |
+ * Copyright 2014 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 <math.h> |
+ |
+#include "webrtc/base/gunit.h" |
+#include "webrtc/base/exp_filter.h" |
+ |
+namespace rtc { |
+ |
+TEST(ExpFilterTest, FirstTimeOutputEqualInput) { |
+ // No max value defined. |
+ ExpFilter filter = ExpFilter(0.9f); |
+ filter.Apply(100.0f, 10.0f); |
+ |
+ // First time, first argument no effect. |
+ double value = 10.0f; |
+ EXPECT_FLOAT_EQ(value, filter.filtered()); |
+} |
+ |
+TEST(ExpFilterTest, SecondTime) { |
+ double value; |
+ |
+ ExpFilter filter = ExpFilter(0.9f); |
+ filter.Apply(100.0f, 10.0f); |
+ |
+ // First time, first argument no effect. |
+ value = 10.0f; |
+ |
+ filter.Apply(10.0f, 20.0f); |
+ double alpha = pow(0.9f, 10.0f); |
+ value = alpha * value + (1.0f - alpha) * 20.0f; |
+ EXPECT_FLOAT_EQ(value, filter.filtered()); |
+} |
+ |
+TEST(ExpFilterTest, Reset) { |
+ ExpFilter filter = ExpFilter(0.9f); |
+ filter.Apply(100.0f, 10.0f); |
+ |
+ filter.Reset(0.8f); |
+ filter.Apply(100.0f, 1.0f); |
+ |
+ // Become first time after a reset. |
+ double value = 1.0f; |
+ EXPECT_FLOAT_EQ(value, filter.filtered()); |
+} |
+ |
+TEST(ExpfilterTest, OutputLimitedByMax) { |
+ double value; |
+ |
+ // Max value defined. |
+ ExpFilter filter = ExpFilter(0.9f, 1.0f); |
+ filter.Apply(100.0f, 10.0f); |
+ |
+ // Limited to max value. |
+ value = 1.0f; |
+ EXPECT_EQ(value, filter.filtered()); |
+ |
+ filter.Apply(1.0f, 0.0f); |
+ value = 0.9f * value; |
+ EXPECT_FLOAT_EQ(value, filter.filtered()); |
+} |
+ |
+} // namespace rtc |