Index: base/metrics/histogram_delta_serialization_unittest.cc |
diff --git a/base/metrics/histogram_delta_serialization_unittest.cc b/base/metrics/histogram_delta_serialization_unittest.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..b53520c5098787539d7d14691597cf125fde7be3 |
--- /dev/null |
+++ b/base/metrics/histogram_delta_serialization_unittest.cc |
@@ -0,0 +1,54 @@ |
+// 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 "base/metrics/histogram_delta_serialization.h" |
+ |
+#include <vector> |
+ |
+#include "base/metrics/histogram.h" |
+#include "base/metrics/histogram_base.h" |
+#include "base/metrics/statistics_recorder.h" |
+#include "testing/gtest/include/gtest/gtest.h" |
+ |
+namespace base { |
+ |
+TEST(HistogramDeltaSerializationTest, DeserializeHistogramAndAddSamples) { |
+ StatisticsRecorder statistic_recorder; |
+ HistogramDeltaSerialization serializer("HistogramDeltaSerializationTest"); |
+ std::vector<std::string> deltas; |
+ // Nothing was changed yet. |
+ serializer.PrepareAndSerializeDeltas(&deltas); |
+ EXPECT_TRUE(deltas.empty()); |
+ |
+ HistogramBase* histogram = Histogram::FactoryGet( |
+ "TestHistogram", 1, 1000, 10, HistogramBase::kIPCSerializationSourceFlag); |
+ histogram->Add(1); |
+ histogram->Add(10); |
+ histogram->Add(100); |
+ histogram->Add(1000); |
+ |
+ serializer.PrepareAndSerializeDeltas(&deltas); |
+ EXPECT_FALSE(deltas.empty()); |
+ |
+ HistogramDeltaSerialization::DeserializeAndAddSamples(deltas); |
+ |
+ // The histogram has kIPCSerializationSourceFlag. So samples will be ignored. |
+ scoped_ptr<HistogramSamples> snapshot(histogram->SnapshotSamples()); |
+ EXPECT_EQ(1, snapshot->GetCount(1)); |
+ EXPECT_EQ(1, snapshot->GetCount(10)); |
+ EXPECT_EQ(1, snapshot->GetCount(100)); |
+ EXPECT_EQ(1, snapshot->GetCount(1000)); |
+ |
+ // Clear kIPCSerializationSourceFlag to emulate multi-process usage. |
+ histogram->ClearFlags(HistogramBase::kIPCSerializationSourceFlag); |
+ HistogramDeltaSerialization::DeserializeAndAddSamples(deltas); |
+ |
+ scoped_ptr<HistogramSamples> snapshot2(histogram->SnapshotSamples()); |
+ EXPECT_EQ(2, snapshot2->GetCount(1)); |
+ EXPECT_EQ(2, snapshot2->GetCount(10)); |
+ EXPECT_EQ(2, snapshot2->GetCount(100)); |
+ EXPECT_EQ(2, snapshot2->GetCount(1000)); |
+} |
+ |
+} // namespace base |