third-party/benchmark/test/statistics_gtest.cc

   1 //===---------------------------------------------------------------------===//
   2 // statistics_test - Unit tests for src/statistics.cc
   3 //===---------------------------------------------------------------------===//
   4
   5 #include "../src/statistics.h"
   6 #include "gtest/gtest.h"
   7
   8 namespace {
   9 TEST(StatisticsTest, Mean) {
  10   EXPECT_DOUBLE_EQ(benchmark::StatisticsMean({42, 42, 42, 42}), 42.0);
  11   EXPECT_DOUBLE_EQ(benchmark::StatisticsMean({1, 2, 3, 4}), 2.5);
  12   EXPECT_DOUBLE_EQ(benchmark::StatisticsMean({1, 2, 5, 10, 10, 14}), 7.0);
  13 }
  14
  15 TEST(StatisticsTest, Median) {
  16   EXPECT_DOUBLE_EQ(benchmark::StatisticsMedian({42, 42, 42, 42}), 42.0);
  17   EXPECT_DOUBLE_EQ(benchmark::StatisticsMedian({1, 2, 3, 4}), 2.5);
  18   EXPECT_DOUBLE_EQ(benchmark::StatisticsMedian({1, 2, 5, 10, 10}), 5.0);
  19 }
  20
  21 TEST(StatisticsTest, StdDev) {
  22   EXPECT_DOUBLE_EQ(benchmark::StatisticsStdDev({101, 101, 101, 101}), 0.0);
  23   EXPECT_DOUBLE_EQ(benchmark::StatisticsStdDev({1, 2, 3}), 1.0);
  24   EXPECT_DOUBLE_EQ(benchmark::StatisticsStdDev({2.5, 2.4, 3.3, 4.2, 5.1}),
  25                    1.151086443322134);
  26 }
  27
  28 TEST(StatisticsTest, CV) {
  29   EXPECT_DOUBLE_EQ(benchmark::StatisticsCV({101, 101, 101, 101}), 0.0);
  30   EXPECT_DOUBLE_EQ(benchmark::StatisticsCV({1, 2, 3}), 1. / 2.);
  31   ASSERT_NEAR(benchmark::StatisticsCV({2.5, 2.4, 3.3, 4.2, 5.1}),
  32               0.32888184094918121, 1e-15);
  33 }
  34
  35 }  // end namespace