72 lines
2.5 KiB
C++
72 lines
2.5 KiB
C++
// Copyright 2014 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "components/metrics/histogram_encoder.h"
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#include <string>
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#include "base/metrics/bucket_ranges.h"
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#include "base/metrics/sample_vector.h"
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#include "testing/gtest/include/gtest/gtest.h"
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namespace metrics {
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TEST(HistogramEncoder, HistogramBucketFields) {
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// Create buckets: 1-5, 5-7, 7-8, 8-9, 9-10, 10-11, 11-12.
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base::BucketRanges ranges(8);
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ranges.set_range(0, 1);
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ranges.set_range(1, 5);
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ranges.set_range(2, 7);
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ranges.set_range(3, 8);
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ranges.set_range(4, 9);
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ranges.set_range(5, 10);
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ranges.set_range(6, 11);
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ranges.set_range(7, 12);
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base::SampleVector samples(1, &ranges);
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samples.Accumulate(3, 1); // Bucket 1-5.
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samples.Accumulate(6, 1); // Bucket 5-7.
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samples.Accumulate(8, 1); // Bucket 8-9. (7-8 skipped)
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samples.Accumulate(10, 1); // Bucket 10-11. (9-10 skipped)
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samples.Accumulate(11, 1); // Bucket 11-12.
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ChromeUserMetricsExtension uma_proto;
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EncodeHistogramDelta("Test", samples, &uma_proto);
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const HistogramEventProto& histogram_proto =
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uma_proto.histogram_event(uma_proto.histogram_event_size() - 1);
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// Buckets with samples: 1-5, 5-7, 8-9, 10-11, 11-12.
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// Should become: 1-/, 5-7, /-9, 10-/, /-12.
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ASSERT_EQ(5, histogram_proto.bucket_size());
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// 1-5 becomes 1-/ (max is same as next min).
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EXPECT_TRUE(histogram_proto.bucket(0).has_min());
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EXPECT_FALSE(histogram_proto.bucket(0).has_max());
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EXPECT_EQ(1, histogram_proto.bucket(0).min());
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// 5-7 stays 5-7 (no optimization possible).
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EXPECT_TRUE(histogram_proto.bucket(1).has_min());
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EXPECT_TRUE(histogram_proto.bucket(1).has_max());
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EXPECT_EQ(5, histogram_proto.bucket(1).min());
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EXPECT_EQ(7, histogram_proto.bucket(1).max());
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// 8-9 becomes /-9 (min is same as max - 1).
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EXPECT_FALSE(histogram_proto.bucket(2).has_min());
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EXPECT_TRUE(histogram_proto.bucket(2).has_max());
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EXPECT_EQ(9, histogram_proto.bucket(2).max());
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// 10-11 becomes 10-/ (both optimizations apply, omit max is prioritized).
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EXPECT_TRUE(histogram_proto.bucket(3).has_min());
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EXPECT_FALSE(histogram_proto.bucket(3).has_max());
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EXPECT_EQ(10, histogram_proto.bucket(3).min());
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// 11-12 becomes /-12 (last record must keep max, min is same as max - 1).
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EXPECT_FALSE(histogram_proto.bucket(4).has_min());
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EXPECT_TRUE(histogram_proto.bucket(4).has_max());
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EXPECT_EQ(12, histogram_proto.bucket(4).max());
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}
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} // namespace metrics
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