31 lines
613 B
Go
31 lines
613 B
Go
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package stats
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import (
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"testing"
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"math/rand"
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)
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func TestPercentiles(t *testing.T) {
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testInRange(t, 1, 0.5)
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testInRange(t, 1, 0.9)
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testInRange(t, 1, 0.95)
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testInRange(t, 10000, 0.5)
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testInRange(t, 10000, 0.9)
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testInRange(t, 10000, 0.95)
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}
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func testInRange(t *testing.T, max, percentile float64) {
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p := NewPercentile(percentile, 10)
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for i := 0; i < 1000; i++ {
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p.AddSample(rand.Float64() * max)
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}
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got := p.Value()
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expected := percentile * max
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if got < expected * (1 - 0.02) || got > expected * (1 + 0.02) {
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t.Errorf("Percentile out of range\n actual: %f\nexpected: %f", got, expected)
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}
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}
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