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67 lines
1.3 KiB
67 lines
1.3 KiB
// Copyright 2020-present PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package fastrand
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import (
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"fmt"
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"math/rand"
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"testing"
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. "github.com/pingcap/check"
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)
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var _ = Suite(&testRandSuite{})
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type testRandSuite struct {
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}
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func (s *testRandSuite) TestRand(c *C) {
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x := Uint32N(1024)
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c.Assert(x < 1024, IsTrue)
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y := Uint64N(1 << 63)
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c.Assert(y < 1<<63, IsTrue)
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_ = Buf(20)
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var arr [256]bool
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for i := 0; i < 1024; i++ {
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idx := Uint32N(256)
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arr[idx] = true
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}
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sum := 0
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for i := 0; i < 256; i++ {
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if arr[i] == false {
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sum++
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}
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}
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fmt.Println(sum)
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c.Assert(sum < 24, IsTrue)
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}
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func BenchmarkFastRand(b *testing.B) {
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b.RunParallel(func(pb *testing.PB) {
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for pb.Next() {
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Uint32()
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}
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})
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b.Log(Uint32())
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}
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func BenchmarkGlobalRand(b *testing.B) {
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b.RunParallel(func(pb *testing.PB) {
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for pb.Next() {
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rand.Int()
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}
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})
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b.Log(rand.Int())
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}
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