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path: root/metrics/timer_test.go
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package metrics

import (
    "fmt"
    "math"
    "testing"
    "time"
)

func BenchmarkTimer(b *testing.B) {
    tm := NewTimer()
    b.ResetTimer()
    for i := 0; i < b.N; i++ {
        tm.Update(1)
    }
}

func TestGetOrRegisterTimer(t *testing.T) {
    r := NewRegistry()
    NewRegisteredTimer("foo", r).Update(47)
    if tm := GetOrRegisterTimer("foo", r); 1 != tm.Count() {
        t.Fatal(tm)
    }
}

func TestTimerExtremes(t *testing.T) {
    tm := NewTimer()
    tm.Update(math.MaxInt64)
    tm.Update(0)
    if stdDev := tm.StdDev(); 4.611686018427388e+18 != stdDev {
        t.Errorf("tm.StdDev(): 4.611686018427388e+18 != %v\n", stdDev)
    }
}

func TestTimerStop(t *testing.T) {
    l := len(arbiter.meters)
    tm := NewTimer()
    if len(arbiter.meters) != l+1 {
        t.Errorf("arbiter.meters: %d != %d\n", l+1, len(arbiter.meters))
    }
    tm.Stop()
    if len(arbiter.meters) != l {
        t.Errorf("arbiter.meters: %d != %d\n", l, len(arbiter.meters))
    }
}

func TestTimerFunc(t *testing.T) {
    tm := NewTimer()
    tm.Time(func() { time.Sleep(50e6) })
    if max := tm.Max(); 45e6 > max || max > 55e6 {
        t.Errorf("tm.Max(): 45e6 > %v || %v > 55e6\n", max, max)
    }
}

func TestTimerZero(t *testing.T) {
    tm := NewTimer()
    if count := tm.Count(); 0 != count {
        t.Errorf("tm.Count(): 0 != %v\n", count)
    }
    if min := tm.Min(); 0 != min {
        t.Errorf("tm.Min(): 0 != %v\n", min)
    }
    if max := tm.Max(); 0 != max {
        t.Errorf("tm.Max(): 0 != %v\n", max)
    }
    if mean := tm.Mean(); 0.0 != mean {
        t.Errorf("tm.Mean(): 0.0 != %v\n", mean)
    }
    if stdDev := tm.StdDev(); 0.0 != stdDev {
        t.Errorf("tm.StdDev(): 0.0 != %v\n", stdDev)
    }
    ps := tm.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])
    }
    if rate1 := tm.Rate1(); 0.0 != rate1 {
        t.Errorf("tm.Rate1(): 0.0 != %v\n", rate1)
    }
    if rate5 := tm.Rate5(); 0.0 != rate5 {
        t.Errorf("tm.Rate5(): 0.0 != %v\n", rate5)
    }
    if rate15 := tm.Rate15(); 0.0 != rate15 {
        t.Errorf("tm.Rate15(): 0.0 != %v\n", rate15)
    }
    if rateMean := tm.RateMean(); 0.0 != rateMean {
        t.Errorf("tm.RateMean(): 0.0 != %v\n", rateMean)
    }
}

func ExampleGetOrRegisterTimer() {
    m := "account.create.latency"
    t := GetOrRegisterTimer(m, nil)
    t.Update(47)
    fmt.Println(t.Max()) // Output: 47
}