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path: root/metrics/histogram_test.go
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package metrics

import "testing"

func BenchmarkHistogram(b *testing.B) {
    h := NewHistogram(NewUniformSample(100))
    b.ResetTimer()
    for i := 0; i < b.N; i++ {
        h.Update(int64(i))
    }
}

func TestGetOrRegisterHistogram(t *testing.T) {
    r := NewRegistry()
    s := NewUniformSample(100)
    NewRegisteredHistogram("foo", r, s).Update(47)
    if h := GetOrRegisterHistogram("foo", r, s); 1 != h.Count() {
        t.Fatal(h)
    }
}

func TestHistogram10000(t *testing.T) {
    h := NewHistogram(NewUniformSample(100000))
    for i := 1; i <= 10000; i++ {
        h.Update(int64(i))
    }
    testHistogram10000(t, h)
}

func TestHistogramEmpty(t *testing.T) {
    h := NewHistogram(NewUniformSample(100))
    if count := h.Count(); 0 != count {
        t.Errorf("h.Count(): 0 != %v\n", count)
    }
    if min := h.Min(); 0 != min {
        t.Errorf("h.Min(): 0 != %v\n", min)
    }
    if max := h.Max(); 0 != max {
        t.Errorf("h.Max(): 0 != %v\n", max)
    }
    if mean := h.Mean(); 0.0 != mean {
        t.Errorf("h.Mean(): 0.0 != %v\n", mean)
    }
    if stdDev := h.StdDev(); 0.0 != stdDev {
        t.Errorf("h.StdDev(): 0.0 != %v\n", stdDev)
    }
    ps := h.Percentiles([]float64{0.5, 0.75, 0.99})
    if 0.0 != ps[0] {
        t.Errorf("median: 0.0 != %v\n", ps[0])
    }
    if 0.0 != ps[1] {
        t.Errorf("75th percentile: 0.0 != %v\n", ps[1])
    }
    if 0.0 != ps[2] {
        t.Errorf("99th percentile: 0.0 != %v\n", ps[2])
    }
}

func TestHistogramSnapshot(t *testing.T) {
    h := NewHistogram(NewUniformSample(100000))
    for i := 1; i <= 10000; i++ {
        h.Update(int64(i))
    }
    snapshot := h.Snapshot()
    h.Update(0)
    testHistogram10000(t, snapshot)
}

func testHistogram10000(t *testing.T, h Histogram) {
    if count := h.Count(); 10000 != count {
        t.Errorf("h.Count(): 10000 != %v\n", count)
    }
    if min := h.Min(); 1 != min {
        t.Errorf("h.Min(): 1 != %v\n", min)
    }
    if max := h.Max(); 10000 != max {
        t.Errorf("h.Max(): 10000 != %v\n", max)
    }
    if mean := h.Mean(); 5000.5 != mean {
        t.Errorf("h.Mean(): 5000.5 != %v\n", mean)
    }
    if stdDev := h.StdDev(); 2886.751331514372 != stdDev {
        t.Errorf("h.StdDev(): 2886.751331514372 != %v\n", stdDev)
    }
    ps := h.Percentiles([]float64{0.5, 0.75, 0.99})
    if 5000.5 != ps[0] {
        t.Errorf("median: 5000.5 != %v\n", ps[0])
    }
    if 7500.75 != ps[1] {
        t.Errorf("75th percentile: 7500.75 != %v\n", ps[1])
    }
    if 9900.99 != ps[2] {
        t.Errorf("99th percentile: 9900.99 != %v\n", ps[2])
    }
}