326 lines
7.4 KiB
Go
326 lines
7.4 KiB
Go
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// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package trace
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import (
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"math"
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"testing"
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)
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type sumTest struct {
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value int64
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sum int64
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sumOfSquares float64
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total int64
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}
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var sumTests = []sumTest{
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{100, 100, 10000, 1},
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{50, 150, 12500, 2},
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{50, 200, 15000, 3},
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{50, 250, 17500, 4},
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}
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type bucketingTest struct {
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in int64
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log int
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bucket int
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}
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var bucketingTests = []bucketingTest{
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{0, 0, 0},
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{1, 1, 0},
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{2, 2, 1},
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{3, 2, 1},
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{4, 3, 2},
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{1000, 10, 9},
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{1023, 10, 9},
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{1024, 11, 10},
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{1000000, 20, 19},
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}
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type multiplyTest struct {
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in int64
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ratio float64
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expectedSum int64
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expectedTotal int64
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expectedSumOfSquares float64
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}
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var multiplyTests = []multiplyTest{
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{15, 2.5, 37, 2, 562.5},
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{128, 4.6, 758, 13, 77953.9},
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}
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type percentileTest struct {
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fraction float64
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expected int64
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}
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var percentileTests = []percentileTest{
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{0.25, 48},
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{0.5, 96},
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{0.6, 109},
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{0.75, 128},
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{0.90, 205},
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{0.95, 230},
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{0.99, 256},
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}
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func TestSum(t *testing.T) {
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var h histogram
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for _, test := range sumTests {
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h.addMeasurement(test.value)
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sum := h.sum
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if sum != test.sum {
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t.Errorf("h.Sum = %v WANT: %v", sum, test.sum)
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}
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sumOfSquares := h.sumOfSquares
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if sumOfSquares != test.sumOfSquares {
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t.Errorf("h.SumOfSquares = %v WANT: %v", sumOfSquares, test.sumOfSquares)
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}
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total := h.total()
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if total != test.total {
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t.Errorf("h.Total = %v WANT: %v", total, test.total)
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}
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}
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}
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func TestMultiply(t *testing.T) {
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var h histogram
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for i, test := range multiplyTests {
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h.addMeasurement(test.in)
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h.Multiply(test.ratio)
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if h.sum != test.expectedSum {
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t.Errorf("#%v: h.sum = %v WANT: %v", i, h.sum, test.expectedSum)
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}
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if h.total() != test.expectedTotal {
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t.Errorf("#%v: h.total = %v WANT: %v", i, h.total(), test.expectedTotal)
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}
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if h.sumOfSquares != test.expectedSumOfSquares {
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t.Errorf("#%v: h.SumOfSquares = %v WANT: %v", i, test.expectedSumOfSquares, h.sumOfSquares)
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}
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}
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}
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func TestBucketingFunctions(t *testing.T) {
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for _, test := range bucketingTests {
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log := log2(test.in)
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if log != test.log {
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t.Errorf("log2 = %v WANT: %v", log, test.log)
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}
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bucket := getBucket(test.in)
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if bucket != test.bucket {
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t.Errorf("getBucket = %v WANT: %v", bucket, test.bucket)
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}
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}
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}
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func TestAverage(t *testing.T) {
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a := new(histogram)
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average := a.average()
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if average != 0 {
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t.Errorf("Average of empty histogram was %v WANT: 0", average)
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}
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a.addMeasurement(1)
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a.addMeasurement(1)
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a.addMeasurement(3)
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const expected = float64(5) / float64(3)
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average = a.average()
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if !isApproximate(average, expected) {
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t.Errorf("Average = %g WANT: %v", average, expected)
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}
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}
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func TestStandardDeviation(t *testing.T) {
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a := new(histogram)
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add(a, 10, 1<<4)
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add(a, 10, 1<<5)
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add(a, 10, 1<<6)
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stdDev := a.standardDeviation()
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const expected = 19.95
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if !isApproximate(stdDev, expected) {
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t.Errorf("StandardDeviation = %v WANT: %v", stdDev, expected)
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}
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// No values
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a = new(histogram)
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stdDev = a.standardDeviation()
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if !isApproximate(stdDev, 0) {
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t.Errorf("StandardDeviation = %v WANT: 0", stdDev)
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}
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add(a, 1, 1<<4)
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if !isApproximate(stdDev, 0) {
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t.Errorf("StandardDeviation = %v WANT: 0", stdDev)
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}
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add(a, 10, 1<<4)
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if !isApproximate(stdDev, 0) {
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t.Errorf("StandardDeviation = %v WANT: 0", stdDev)
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}
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}
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func TestPercentileBoundary(t *testing.T) {
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a := new(histogram)
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add(a, 5, 1<<4)
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add(a, 10, 1<<6)
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add(a, 5, 1<<7)
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for _, test := range percentileTests {
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percentile := a.percentileBoundary(test.fraction)
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if percentile != test.expected {
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t.Errorf("h.PercentileBoundary (fraction=%v) = %v WANT: %v", test.fraction, percentile, test.expected)
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}
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}
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}
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func TestCopyFrom(t *testing.T) {
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a := histogram{5, 25, []int64{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
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19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38}, 4, -1}
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b := histogram{6, 36, []int64{2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
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20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39}, 5, -1}
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a.CopyFrom(&b)
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if a.String() != b.String() {
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t.Errorf("a.String = %s WANT: %s", a.String(), b.String())
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}
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}
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func TestClear(t *testing.T) {
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a := histogram{5, 25, []int64{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
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19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38}, 4, -1}
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a.Clear()
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expected := "0, 0.000000, 0, 0, []"
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if a.String() != expected {
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t.Errorf("a.String = %s WANT %s", a.String(), expected)
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}
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}
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func TestNew(t *testing.T) {
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a := histogram{5, 25, []int64{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
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19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38}, 4, -1}
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b := a.New()
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expected := "0, 0.000000, 0, 0, []"
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if b.(*histogram).String() != expected {
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t.Errorf("b.(*histogram).String = %s WANT: %s", b.(*histogram).String(), expected)
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}
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}
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func TestAdd(t *testing.T) {
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// The tests here depend on the associativity of addMeasurement and Add.
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// Add empty observation
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a := histogram{5, 25, []int64{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
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19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38}, 4, -1}
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b := a.New()
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expected := a.String()
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a.Add(b)
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if a.String() != expected {
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t.Errorf("a.String = %s WANT: %s", a.String(), expected)
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}
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// Add same bucketed value, no new buckets
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c := new(histogram)
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d := new(histogram)
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e := new(histogram)
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c.addMeasurement(12)
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d.addMeasurement(11)
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e.addMeasurement(12)
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e.addMeasurement(11)
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c.Add(d)
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if c.String() != e.String() {
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t.Errorf("c.String = %s WANT: %s", c.String(), e.String())
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}
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// Add bucketed values
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f := new(histogram)
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g := new(histogram)
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h := new(histogram)
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f.addMeasurement(4)
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f.addMeasurement(12)
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f.addMeasurement(100)
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g.addMeasurement(18)
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g.addMeasurement(36)
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g.addMeasurement(255)
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h.addMeasurement(4)
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h.addMeasurement(12)
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h.addMeasurement(100)
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h.addMeasurement(18)
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h.addMeasurement(36)
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h.addMeasurement(255)
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f.Add(g)
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if f.String() != h.String() {
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t.Errorf("f.String = %q WANT: %q", f.String(), h.String())
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}
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// add buckets to no buckets
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i := new(histogram)
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j := new(histogram)
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k := new(histogram)
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j.addMeasurement(18)
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j.addMeasurement(36)
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j.addMeasurement(255)
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k.addMeasurement(18)
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k.addMeasurement(36)
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k.addMeasurement(255)
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i.Add(j)
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if i.String() != k.String() {
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t.Errorf("i.String = %q WANT: %q", i.String(), k.String())
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}
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// add buckets to single value (no overlap)
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l := new(histogram)
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m := new(histogram)
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n := new(histogram)
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l.addMeasurement(0)
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m.addMeasurement(18)
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m.addMeasurement(36)
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m.addMeasurement(255)
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n.addMeasurement(0)
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n.addMeasurement(18)
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n.addMeasurement(36)
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n.addMeasurement(255)
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l.Add(m)
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if l.String() != n.String() {
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t.Errorf("l.String = %q WANT: %q", l.String(), n.String())
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}
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// mixed order
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o := new(histogram)
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p := new(histogram)
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o.addMeasurement(0)
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o.addMeasurement(2)
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o.addMeasurement(0)
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p.addMeasurement(0)
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p.addMeasurement(0)
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p.addMeasurement(2)
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if o.String() != p.String() {
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t.Errorf("o.String = %q WANT: %q", o.String(), p.String())
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}
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}
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func add(h *histogram, times int, val int64) {
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for i := 0; i < times; i++ {
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h.addMeasurement(val)
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}
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}
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func isApproximate(x, y float64) bool {
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return math.Abs(x-y) < 1e-2
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}
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