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