| // Copyright (c) 2012 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. |
| |
| #ifndef CHROME_TEST_BASE_UMA_HISTOGRAM_HELPER_H_ |
| #define CHROME_TEST_BASE_UMA_HISTOGRAM_HELPER_H_ |
| |
| #include "base/metrics/histogram.h" |
| #include "base/metrics/histogram_base.h" |
| #include "base/metrics/histogram_samples.h" |
| |
| // UMAHistogramHelper provides a simple interface for examining UMA histograms. |
| // Tests can use this interface to verify that UMA data is getting logged as |
| // intended. |
| class UMAHistogramHelper { |
| public: |
| UMAHistogramHelper(); |
| |
| // Each child process may have its own histogram data, make sure this data |
| // gets accumulated into the browser process before we examine the histograms. |
| void Fetch(); |
| |
| // We know the exact number of samples in a bucket, and that no other bucket |
| // should have samples. |
| void ExpectUniqueSample(const std::string& name, |
| base::HistogramBase::Sample sample, |
| base::HistogramBase::Count expected_count); |
| |
| // We don't know the values of the samples, but we know how many there are. |
| void ExpectTotalCount(const std::string& name, |
| base::HistogramBase::Count count); |
| |
| private: |
| void FetchCallback(); |
| |
| void CheckBucketCount(const std::string& name, |
| base::HistogramBase::Sample sample, |
| base::Histogram::Count expected_count, |
| base::HistogramSamples& samples); |
| |
| void CheckTotalCount(const std::string& name, |
| base::Histogram::Count expected_count, |
| base::HistogramSamples& samples); |
| |
| DISALLOW_COPY_AND_ASSIGN(UMAHistogramHelper); |
| }; |
| |
| #endif // CHROME_TEST_BASE_UMA_HISTOGRAM_HELPER_H_ |