1 package metrics
2
3 import "testing"
4
5 func BenchmarkHistogram(b *testing.B) {
6 h := NewHistogram(NewUniformSample(100))
7 b.ResetTimer()
8 for i := 0; i < b.N; i++ {
9 h.Update(int64(i))
10 }
11 }
12
13 func TestGetOrRegisterHistogram(t *testing.T) {
14 r := NewRegistry()
15 s := NewUniformSample(100)
16 NewRegisteredHistogram("foo", r, s).Update(47)
17 if h := GetOrRegisterHistogram("foo", r, s); 1 != h.Count() {
18 t.Fatal(h)
19 }
20 }
21
22 func TestHistogram10000(t *testing.T) {
23 h := NewHistogram(NewUniformSample(100000))
24 for i := 1; i <= 10000; i++ {
25 h.Update(int64(i))
26 }
27 testHistogram10000(t, h)
28 }
29
30 func TestHistogramEmpty(t *testing.T) {
31 h := NewHistogram(NewUniformSample(100))
32 if count := h.Count(); 0 != count {
33 t.Errorf("h.Count(): 0 != %v\n", count)
34 }
35 if min := h.Min(); 0 != min {
36 t.Errorf("h.Min(): 0 != %v\n", min)
37 }
38 if max := h.Max(); 0 != max {
39 t.Errorf("h.Max(): 0 != %v\n", max)
40 }
41 if mean := h.Mean(); 0.0 != mean {
42 t.Errorf("h.Mean(): 0.0 != %v\n", mean)
43 }
44 if stdDev := h.StdDev(); 0.0 != stdDev {
45 t.Errorf("h.StdDev(): 0.0 != %v\n", stdDev)
46 }
47 ps := h.Percentiles([]float64{0.5, 0.75, 0.99})
48 if 0.0 != ps[0] {
49 t.Errorf("median: 0.0 != %v\n", ps[0])
50 }
51 if 0.0 != ps[1] {
52 t.Errorf("75th percentile: 0.0 != %v\n", ps[1])
53 }
54 if 0.0 != ps[2] {
55 t.Errorf("99th percentile: 0.0 != %v\n", ps[2])
56 }
57 }
58
59 func TestHistogramSnapshot(t *testing.T) {
60 h := NewHistogram(NewUniformSample(100000))
61 for i := 1; i <= 10000; i++ {
62 h.Update(int64(i))
63 }
64 snapshot := h.Snapshot()
65 h.Update(0)
66 testHistogram10000(t, snapshot)
67 }
68
69 func testHistogram10000(t *testing.T, h Histogram) {
70 if count := h.Count(); 10000 != count {
71 t.Errorf("h.Count(): 10000 != %v\n", count)
72 }
73 if min := h.Min(); 1 != min {
74 t.Errorf("h.Min(): 1 != %v\n", min)
75 }
76 if max := h.Max(); 10000 != max {
77 t.Errorf("h.Max(): 10000 != %v\n", max)
78 }
79 if mean := h.Mean(); 5000.5 != mean {
80 t.Errorf("h.Mean(): 5000.5 != %v\n", mean)
81 }
82 if stdDev := h.StdDev(); 2886.751331514372 != stdDev {
83 t.Errorf("h.StdDev(): 2886.751331514372 != %v\n", stdDev)
84 }
85 ps := h.Percentiles([]float64{0.5, 0.75, 0.99})
86 if 5000.5 != ps[0] {
87 t.Errorf("median: 5000.5 != %v\n", ps[0])
88 }
89 if 7500.75 != ps[1] {
90 t.Errorf("75th percentile: 7500.75 != %v\n", ps[1])
91 }
92 if 9900.99 != ps[2] {
93 t.Errorf("99th percentile: 9900.99 != %v\n", ps[2])
94 }
95 }
96
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