github.com/anthdm/go-ethereum@v1.8.4-0.20180412101906-60516c83b011/metrics/histogram_test.go (about)

     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  }