83 lines
1.8 KiB
Go
83 lines
1.8 KiB
Go
// Copyright (C) 2014 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at http://mozilla.org/MPL/2.0/.
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package main
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import (
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"runtime"
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"sync"
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"testing"
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)
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var predictableRandomTest sync.Once
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func TestPredictableRandom(t *testing.T) {
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if runtime.GOARCH != "amd64" {
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t.Skip("Test only for 64 bit platforms; but if it works there, it should work on 32 bit")
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}
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predictableRandomTest.Do(func() {
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// predictable random sequence is predictable
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e := int64(3440579354231278675)
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if v := int64(predictableRandom.Int()); v != e {
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t.Errorf("Unexpected random value %d != %d", v, e)
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}
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})
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}
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func TestSeedFromBytes(t *testing.T) {
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// should always return the same seed for the same bytes
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tcs := []struct {
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bs []byte
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v int64
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}{
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{[]byte("hello world"), -3639725434188061933},
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{[]byte("hello worlx"), -2539100776074091088},
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}
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for _, tc := range tcs {
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if v := seedFromBytes(tc.bs); v != tc.v {
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t.Errorf("Unexpected seed value %d != %d", v, tc.v)
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}
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}
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}
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func TestRandomString(t *testing.T) {
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for _, l := range []int{0, 1, 2, 3, 4, 8, 42} {
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s := randomString(l)
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if len(s) != l {
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t.Errorf("Incorrect length %d != %d", len(s), l)
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}
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}
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strings := make([]string, 1000)
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for i := range strings {
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strings[i] = randomString(8)
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for j := range strings {
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if i == j {
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continue
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}
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if strings[i] == strings[j] {
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t.Errorf("Repeated random string %q", strings[i])
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}
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}
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}
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}
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func TestRandomInt64(t *testing.T) {
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ints := make([]int64, 1000)
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for i := range ints {
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ints[i] = randomInt64()
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for j := range ints {
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if i == j {
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continue
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}
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if ints[i] == ints[j] {
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t.Errorf("Repeated random int64 %d", ints[i])
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}
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}
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}
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}
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