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59 lines
1.2 KiB
59 lines
1.2 KiB
package mrand
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import (
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. "testing"
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"github.com/stretchr/testify/assert"
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)
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func TestRandBytes(t *T) {
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var prev []byte
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for i := 0; i < 10000; i++ {
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curr := Bytes(16)
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assert.Len(t, curr, 16)
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assert.NotEqual(t, prev, curr)
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prev = curr
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}
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}
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func TestRandHex(t *T) {
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// RandHex is basically a wrapper of RandBytes, so we don't have to test it
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// much
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assert.Len(t, Hex(16), 16)
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}
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func TestRandElement(t *T) {
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slice := []uint64{1, 2, 3} // values are also each value's weight
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total := func() uint64 {
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var t uint64
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for i := range slice {
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t += slice[i]
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}
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return t
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}()
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m := map[uint64]uint64{}
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iterations := 100000
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for i := 0; i < iterations; i++ {
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el := Element(slice, func(i int) uint64 { return slice[i] }).(uint64)
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m[el]++
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}
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for i := range slice {
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t.Logf("%d -> %d (%f)", slice[i], m[slice[i]], float64(m[slice[i]])/float64(iterations))
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}
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assertEl := func(i int) {
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el, elF := slice[i], float64(slice[i])
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gotRatio := float64(m[el]) / float64(iterations)
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expRatio := elF / float64(total)
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diff := (gotRatio - expRatio) / expRatio
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if diff > 0.1 || diff < -0.1 {
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t.Fatalf("ratio of element %d is off: got %f, expected %f (diff:%f)", el, gotRatio, expRatio, diff)
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}
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}
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for i := range slice {
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assertEl(i)
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}
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}
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