histogram_encoder_unittest.cc 2.5 KB

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  1. // Copyright 2014 The Chromium Authors. All rights reserved.
  2. // Use of this source code is governed by a BSD-style license that can be
  3. // found in the LICENSE file.
  4. #include "components/metrics/histogram_encoder.h"
  5. #include <string>
  6. #include "base/metrics/bucket_ranges.h"
  7. #include "base/metrics/sample_vector.h"
  8. #include "testing/gtest/include/gtest/gtest.h"
  9. namespace metrics {
  10. TEST(HistogramEncoder, HistogramBucketFields) {
  11. // Create buckets: 1-5, 5-7, 7-8, 8-9, 9-10, 10-11, 11-12.
  12. base::BucketRanges ranges(8);
  13. ranges.set_range(0, 1);
  14. ranges.set_range(1, 5);
  15. ranges.set_range(2, 7);
  16. ranges.set_range(3, 8);
  17. ranges.set_range(4, 9);
  18. ranges.set_range(5, 10);
  19. ranges.set_range(6, 11);
  20. ranges.set_range(7, 12);
  21. base::SampleVector samples(1, &ranges);
  22. samples.Accumulate(3, 1); // Bucket 1-5.
  23. samples.Accumulate(6, 1); // Bucket 5-7.
  24. samples.Accumulate(8, 1); // Bucket 8-9. (7-8 skipped)
  25. samples.Accumulate(10, 1); // Bucket 10-11. (9-10 skipped)
  26. samples.Accumulate(11, 1); // Bucket 11-12.
  27. ChromeUserMetricsExtension uma_proto;
  28. EncodeHistogramDelta("Test", samples, &uma_proto);
  29. const HistogramEventProto& histogram_proto =
  30. uma_proto.histogram_event(uma_proto.histogram_event_size() - 1);
  31. // Buckets with samples: 1-5, 5-7, 8-9, 10-11, 11-12.
  32. // Should become: 1-/, 5-7, /-9, 10-/, /-12.
  33. ASSERT_EQ(5, histogram_proto.bucket_size());
  34. // 1-5 becomes 1-/ (max is same as next min).
  35. EXPECT_TRUE(histogram_proto.bucket(0).has_min());
  36. EXPECT_FALSE(histogram_proto.bucket(0).has_max());
  37. EXPECT_EQ(1, histogram_proto.bucket(0).min());
  38. // 5-7 stays 5-7 (no optimization possible).
  39. EXPECT_TRUE(histogram_proto.bucket(1).has_min());
  40. EXPECT_TRUE(histogram_proto.bucket(1).has_max());
  41. EXPECT_EQ(5, histogram_proto.bucket(1).min());
  42. EXPECT_EQ(7, histogram_proto.bucket(1).max());
  43. // 8-9 becomes /-9 (min is same as max - 1).
  44. EXPECT_FALSE(histogram_proto.bucket(2).has_min());
  45. EXPECT_TRUE(histogram_proto.bucket(2).has_max());
  46. EXPECT_EQ(9, histogram_proto.bucket(2).max());
  47. // 10-11 becomes 10-/ (both optimizations apply, omit max is prioritized).
  48. EXPECT_TRUE(histogram_proto.bucket(3).has_min());
  49. EXPECT_FALSE(histogram_proto.bucket(3).has_max());
  50. EXPECT_EQ(10, histogram_proto.bucket(3).min());
  51. // 11-12 becomes /-12 (last record must keep max, min is same as max - 1).
  52. EXPECT_FALSE(histogram_proto.bucket(4).has_min());
  53. EXPECT_TRUE(histogram_proto.bucket(4).has_max());
  54. EXPECT_EQ(12, histogram_proto.bucket(4).max());
  55. }
  56. } // namespace metrics