Histogram_test.cc

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#include <gtest/gtest.h>

#include <ACG/Utils/Histogram.hh>

#include <numeric>

using ACG::Histogram;
using ACG::HistogramT;

class HistogramTest : public testing::Test {

public:
  HistogramTest()
  {
  }

protected:
  // This function is called before each test is run
  virtual void SetUp() {
  }

  // This function is called after all tests are through
  virtual void TearDown() {
  }
};

TEST_F(HistogramTest, simpleDouble ) {
    std::vector<double> v {1.0, 1.1, 2.0};
    HistogramT<double> hist(v.begin(), v.end(), 2);

    std::vector<size_t> correct_bins {2, 1};
    EXPECT_EQ(hist.getBins(), correct_bins);


    auto widths = hist.getBinWidths();
    ASSERT_EQ(widths.size(), 2);
    EXPECT_DOUBLE_EQ(widths[0], 0.5);
    EXPECT_DOUBLE_EQ(widths[1], 0.5);

    double width_sum = std::accumulate(widths.begin(), widths.end(), 0.0);
    double total_width = hist.getTotalWidth();
    EXPECT_DOUBLE_EQ(total_width, 1.0);
    EXPECT_DOUBLE_EQ(total_width, width_sum);

    auto boundaries = hist.getBinBoundaries();
    ASSERT_EQ(boundaries.size(), 3);
    EXPECT_DOUBLE_EQ(boundaries.at(0), 1);
    EXPECT_DOUBLE_EQ(boundaries.at(1), 1.5);
    EXPECT_DOUBLE_EQ(boundaries.at(2), 2);
}

#if 0 // not yet implemented
TEST_F(HistogramTest, simpleInt ) {
    std::vector<int> v {0, 1, 1, 2, 5};
    HistogramT<int> hist(v.begin(), v.end(), 3);
    // should be: 0-1, 2-3, 4-5
    //    counts: 3    1    1

    std::vector<size_t> correct_bins {2, 1, 1};
    EXPECT_EQ(hist.getBins(), correct_bins);


    auto widths = hist.getBinWidths();
    ASSERT_EQ(widths.size(), 3);
    EXPECT_EQ(widths[0], 2);
    EXPECT_EQ(widths[1], 2);
    EXPECT_EQ(widths[2], 2);

    int width_sum = std::accumulate(widths.begin(), widths.end(), 0.0);
    int total_width = hist.getTotalWidth();
    EXPECT_EQ(total_width, 6);
    EXPECT_EQ(total_width, width_sum);

    std::vector<int> correct_boundaries {0, 2, 4, 5};
    auto boundaries = hist.getBinBoundaries();
    ASSERT_EQ(boundaries, correct_boundaries);
}
#endif