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43 lines
1.5 KiB
Go
43 lines
1.5 KiB
Go
// Copyright © 2023 Ory Corp
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// SPDX-License-Identifier: Apache-2.0
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package x
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import (
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"math"
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"math/rand"
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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var rnd = rand.New(rand.NewSource(time.Now().Unix())) //#nosec G404
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func AssertEqualTime(t *testing.T, expected, actual time.Time) {
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assert.EqualValues(t, expected.UTC().Round(time.Second), actual.UTC().Round(time.Second))
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}
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func RequireEqualTime(t *testing.T, expected, actual time.Time) {
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require.EqualValues(t, expected.UTC().Round(time.Second), actual.UTC().Round(time.Second))
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}
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// RandomDelay returns a time randomly chosen from a normal distribution with mean of base and max/min of base +- deviation
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// From the docstring for the rand.NormFloat64():
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// To produce a different normal distribution, callers can
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// adjust the output using:
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//
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// sample = NormFloat64() * desiredStdDev + desiredMean
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//
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// Since 99.73% of values in a normal distribution lie within three standard deviations from the mean (https://en.wikipedia.org/wiki/68%E2%80%9395%E2%80%9399.7_rule),
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// by taking the standard deviation to be deviation/3, we can get a distribution which fits our bounds nicely with minimal clipping when we take max/mins to cut off the tails.
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func RandomDelay(base, deviation time.Duration) time.Duration {
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max := float64(base + deviation)
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min := float64(base - deviation)
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stddev := float64(deviation) / 3
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sample := rnd.NormFloat64() * (stddev + float64(base))
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boundedSample := math.Min(math.Max(sample, min), max)
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return time.Duration(boundedSample)
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}
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