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https://github.com/Luzifer/go_helpers.git
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33 lines
886 B
Go
33 lines
886 B
Go
package io
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import (
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"crypto/rand"
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"io"
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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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func TestThrottledReader(t *testing.T) {
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var (
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testSize = 10 * 1024 * 1024 // 10 Mi
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testLimit = 20 * 1024 * 1024 // 20 Mi/s
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// 20Mi/s on 10M = 500ms exec time
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expectedTimeMillisecs = float64(testSize) / float64(testLimit) * 1000
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tolerance = 50 // Millisecs
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)
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lr := io.LimitReader(rand.Reader, int64(testSize))
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var tr io.Reader = NewThrottledReader(lr, float64(testLimit))
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start := time.Now()
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n, err := io.Copy(io.Discard, tr)
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require.NoError(t, err)
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assert.Equal(t, int64(testSize), n)
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assert.Greater(t, time.Since(start)/time.Millisecond, time.Duration(expectedTimeMillisecs-float64(tolerance)))
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assert.Less(t, time.Since(start)/time.Millisecond, time.Duration(expectedTimeMillisecs+float64(tolerance)))
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}
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