| // Copyright 2014 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/test/statistics_delta_reader.h" |
| |
| #include "base/memory/scoped_ptr.h" |
| #include "base/metrics/histogram.h" |
| #include "base/metrics/histogram_samples.h" |
| #include "testing/gtest/include/gtest/gtest.h" |
| |
| namespace base { |
| |
| TEST(StatisticsDeltaReaderTest, Scope) { |
| // Record a histogram before the creation of the recorder. |
| UMA_HISTOGRAM_BOOLEAN("Test", true); |
| |
| StatisticsDeltaReader reader; |
| |
| // Verify that no histogram is recorded. |
| scoped_ptr<HistogramSamples> samples( |
| reader.GetHistogramSamplesSinceCreation("Test")); |
| EXPECT_FALSE(samples); |
| |
| // Record a histogram after the creation of the recorder. |
| UMA_HISTOGRAM_BOOLEAN("Test", true); |
| |
| // Verify that one histogram is recorded. |
| samples = reader.GetHistogramSamplesSinceCreation("Test"); |
| EXPECT_TRUE(samples); |
| EXPECT_EQ(1, samples->TotalCount()); |
| } |
| |
| } // namespace base |