golang regress_test 代码
文件路径：/src/math/rand/regress_test.go
/ Copyright 2014 The Go Authors. All rights reserved.
/ Use of this source code is governed by a BSD-style
/ license that can be found in the LICENSE file.
/ Test that random number sequences generated by a specific seed
/ do not change from version to version.
/
/ Do NOT make changes to the golden outputs. If bugs need to be fixed
/ in the underlying code, find ways to fix them that do not affect the
/ outputs.
package rand_test
import (
"flag"
"fmt"
. "math/rand"
"reflect"
"testing"
)
var printgolden = flag.Bool("printgolden", false, "print golden results for regression test")
func TestRegress(t *testing.T) {
var int32s = []int32{1, 10, 32, 1 << 20, 1<<20 + 1, 1000000000, 1 << 30, 1<<31 - 2, 1<<31 - 1}
var int64s = []int64{1, 10, 32, 1 << 20, 1<<20 + 1, 1000000000, 1 << 30, 1<<31 - 2, 1<<31 - 1, 1000000000000000000, 1 << 60, 1<<63 - 2, 1<<63 - 1}
var permSizes = []int{0, 1, 5, 8, 9, 10, 16}
var readBufferSizes = []int{1, 7, 8, 9, 10}
r := New(NewSource(0))
rv := reflect.ValueOf(r)
n := rv.NumMethod()
p := 0
if *printgolden {
fmt.Printf("var regressGolden = []interface{}{\n")
}
for i := 0; i < n; i++ {
m := rv.Type().Method(i)
mv := rv.Method(i)
mt := mv.Type()
if mt.NumOut() == 0 {
continue
}
r.Seed(0)
for repeat := 0; repeat < 20; repeat++ {
var args []reflect.Value
var argstr string
if mt.NumIn() == 1 {
var x any
switch mt.In(0).Kind() {
default:
t.Fatalf("unexpected argument type for r.%s", m.Name)
case reflect.Int:
if m.Name == "Perm" {
x = permSizes[repeat%len(permSizes)]
break
}
big := int64s[repeat%len(int64s)]
if int64(int(big)) != big {
r.Int63n(big) / what would happen on 64-bit machine, to keep stream in sync
if *printgolden {
fmt.Printf("\tskipped, / must run printgolden on 64-bit machine\n")
}
p++
continue
}
x = int(big)
case reflect.Int32:
x = int32s[repeat%len(int32s)]
case reflect.Int64:
x = int64s[repeat%len(int64s)]
case reflect.Slice:
if m.Name == "Read" {
n := readBufferSizes[repeat%len(readBufferSizes)]
x = make([]byte, n)
}
}
argstr = fmt.Sprint(x)
args = append(args, reflect.ValueOf(x))
}
var out any
out = mv.Call(args)[0].Interface()
if m.Name == "Int" || m.Name == "Intn" {
out = int64(out.(int))
}
if m.Name == "Read" {
out = args[0].Interface().([]byte)
}
if *printgolden {
var val string
big := int64(1 << 60)
if int64(int(big)) != big && (m.Name == "Int" || m.Name == "Intn") {
/ 32-bit machine cannot print 64-bit results
val = "truncated"
} else if reflect.TypeOf(out).Kind() == reflect.Slice {
val = fmt.Sprintf("%#v", out)
} else {
val = fmt.Sprintf("%T(%v)", out, out)
}
fmt.Printf("\t%s, / %s(%s)\n", val, m.Name, argstr)
} else {
want := regressGolden[p]
if m.Name == "Int" {
want = int64(int(uint(want.(int64)) << 1 >> 1))
}
if !reflect.DeepEqual(out, want) {
t.Errorf("r.%s(%s) = %v, want %v", m.Name, argstr, out, want)
}
}
p++
}
}
if *printgolden {
fmt.Printf("}\n")
}
}
var regressGolden = []any{
float64(4.668112973579268), / ExpFloat64()
float64(0.1601593871172866), / ExpFloat64()
float64(3.0465834105636), / ExpFloat64()
float64(0.06385839451671879), / ExpFloat64()
float64(1.8578917487258961), / ExpFloat64()
float64(0.784676123472182), / ExpFloat64()
float64(0.11225477361256932), / ExpFloat64()
float64(0.20173283329802255), / ExpFloat64()
float64(0.3468619496201105), / ExpFloat64()
float64(0.35601103454384536), / ExpFloat64()
float64(0.888376329507869), / ExpFloat64()
float64(1.4081362450365698), / ExpFloat64()
float64(1.0077753823151994), / ExpFloat64()
float64(0.23594100766227588), / ExpFloat64()
float64(2.777245612300007), / ExpFloat64()
float64(0.5202997830662377), / ExpFloat64()
float64(1.2842705247770294), / ExpFloat64()
float64(0.030307408362776206), / ExpFloat64()
float64(2.204156824853721), / ExpFloat64()
float64(2.09891923895058), / ExpFloat64()
float32(0.94519615), / Float32()
float32(0.24496509), / Float32()
float32(0.65595627), / Float32()
float32(0.05434384), / Float32()
float32(0.3675872), / Float32()
float32(0.28948045), / Float32()
float32(0.1924386), / Float32()
float32(0.65533215), / Float32()
float32(0.8971697), / Float32()
float32(0.16735445), / Float32()
float32(0.28858566), / Float32()
float32(0.9026048), / Float32()
float32(0.84978026), / Float32()
float32(0.2730468), / Float32()
float32(0.6090802), / Float32()
float32(0.253656), / Float32()
float32(0.7746542), / Float32()
float32(0.017480763), / Float32()
float32(0.78707397), / Float32()
float32(0.7993937), / Float32()
float64(0.9451961492941164), / Float64()
float64(0.24496508529377975), / Float64()
float64(0.6559562651954052), / Float64()
float64(0.05434383959970039), / Float64()
float64(0.36758720663245853), / Float64()
float64(0.2894804331565928), / Float64()
float64(0.19243860967493215), / Float64()
float64(0.6553321508148324), / Float64()
float64(0.897169713149801), / Float64()
float64(0.16735444255905835), / Float64()
float64(0.2885856518054551), / Float64()
float64(0.9026048462705047), / Float64()
float64(0.8497802817628735), / Float64()
float64(0.2730468047134829), / Float64()
float64(0.6090801919903561), / Float64()
float64(0.25365600644283687), / Float64()
float64(0.7746542391859803), / Float64()
float64(0.017480762156647272), / Float64()
float64(0.7870739563039942), / Float64()
float64(0.7993936979594545), / Float64()
int64(8717895732742165505), / Int()
int64(2259404117704393152), / Int()
int64(6050128673802995827), / Int()
int64(501233450539197794), / Int()
int64(3390393562759376202), / Int()
int64(2669985732393126063), / Int()
int64(1774932891286980153), / Int()
int64(6044372234677422456), / Int()
int64(8274930044578894929), / Int()
int64(1543572285742637646), / Int()
int64(2661732831099943416), / Int()
int64(8325060299420976708), / Int()
int64(7837839688282259259), / Int()
int64(2518412263346885298), / Int()
int64(5617773211005988520), / Int()
int64(2339563716805116249), / Int()
int64(7144924247938981575), / Int()
int64(161231572858529631), / Int()
int64(7259475919510918339), / Int()
int64(7373105480197164748), / Int()
int32(2029793274), / Int31()
int32(526058514), / Int31()
int32(1408655353), / Int31()
int32(116702506), / Int31()
int32(789387515), / Int31()
int32(621654496), / Int31()
int32(413258767), / Int31()
int32(1407315077), / Int31()
int32(1926657288), / Int31()
int32(359390928), / Int31()
int32(619732968), / Int31()
int32(1938329147), / Int31()
int32(1824889259), / Int31()
int32(586363548), / Int31()
int32(1307989752), / Int31()
int32(544722126), / Int31()
int32(1663557311), / Int31()
int32(37539650), / Int31()
int32(1690228450), / Int31()
int32(1716684894), / Int31()
int32(0), / Int31n(1)
int32(4), / Int31n(10)
int32(25), / Int31n(32)
int32(310570), / Int31n(1048576)
int32(857611), / Int31n(1048577)
int32(621654496), / Int31n(1000000000)
int32(413258767), / Int31n(1073741824)
int32(1407315077), / Int31n(2147483646)
int32(1926657288), / Int31n(2147483647)
int32(0), / Int31n(1)
int32(8), / Int31n(10)
int32(27), / Int31n(32)
int32(367019), / Int31n(1048576)
int32(209005), / Int31n(1048577)
int32(307989752), / Int31n(1000000000)
int32(544722126), / Int31n(1073741824)
int32(1663557311), / Int31n(2147483646)
int32(37539650), / Int31n(2147483647)
int32(0), / Int31n(1)
int32(4), / Int31n(10)
int64(8717895732742165505), / Int63()
int64(2259404117704393152), / Int63()
int64(6050128673802995827), / Int63()
int64(501233450539197794), / Int63()
int64(3390393562759376202), / Int63()
int64(2669985732393126063), / Int63()
int64(1774932891286980153), / Int63()
int64(6044372234677422456), / Int63()
int64(8274930044578894929), / Int63()
int64(1543572285742637646), / Int63()
int64(2661732831099943416), / Int63()
int64(8325060299420976708), / Int63()
int64(7837839688282259259), / Int63()
int64(2518412263346885298), / Int63()
int64(5617773211005988520), / Int63()
int64(2339563716805116249), / Int63()
int64(7144924247938981575), / Int63()
int64(161231572858529631), / Int63()
int64(7259475919510918339), / Int63()
int64(7373105480197164748), / Int63()
int64(0), / Int63n(1)
int64(2), / Int63n(10)
int64(19), / Int63n(32)
int64(959842), / Int63n(1048576)
int64(688912), / Int63n(1048577)
int64(393126063), / Int63n(1000000000)
int64(89212473), / Int63n(1073741824)
int64(834026388), / Int63n(2147483646)
int64(1577188963), / Int63n(2147483647)
int64(543572285742637646), / Int63n(1000000000000000000)
int64(355889821886249464), / Int63n(1152921504606846976)
int64(8325060299420976708), / Int63n(9223372036854775806)
int64(7837839688282259259), / Int63n(9223372036854775807)
int64(0), / Int63n(1)
int64(0), / Int63n(10)
int64(25), / Int63n(32)
int64(679623), / Int63n(1048576)
int64(882178), / Int63n(1048577)
int64(510918339), / Int63n(1000000000)
int64(782454476), / Int63n(1073741824)
int64(0), / Intn(1)
int64(4), / Intn(10)
int64(25), / Intn(32)
int64(310570), / Intn(1048576)
int64(857611), / Intn(1048577)
int64(621654496), / Intn(1000000000)
int64(413258767), / Intn(1073741824)
int64(1407315077), / Intn(2147483646)
int64(1926657288), / Intn(2147483647)
int64(543572285742637646), / Intn(1000000000000000000)
int64(355889821886249464), / Intn(1152921504606846976)
int64(8325060299420976708), / Intn(9223372036854775806)
int64(7837839688282259259), / Intn(9223372036854775807)
int64(0), / Intn(1)
int64(2), / Intn(10)
int64(14), / Intn(32)
int64(515775), / Intn(1048576)
int64(839455), / Intn(1048577)
int64(690228450), / Intn(1000000000)
int64(642943070), / Intn(1073741824)
float64(-0.28158587086436215), / NormFloat64()
float64(0.570933095808067), / NormFloat64()
float64(-1.6920196326157044), / NormFloat64()
float64(0.1996229111693099), / NormFloat64()
float64(1.9195199291234621), / NormFloat64()
float64(0.8954838794918353), / NormFloat64()
float64(0.41457072128813166), / NormFloat64()
float64(-0.48700161491544713), / NormFloat64()
float64(-0.1684059662402393), / NormFloat64()
float64(0.37056410998929545), / NormFloat64()
float64(1.0156889027029008), / NormFloat64()
float64(-0.5174422210625114), / NormFloat64()
float64(-0.5565834214413804), / NormFloat64()
float64(0.778320596648391), / NormFloat64()
float64(-1.8970718197702225), / NormFloat64()
float64(0.5229525761688676), / NormFloat64()
float64(-1.5515595563231523), / NormFloat64()
float64(0.0182029289376123), / NormFloat64()
float64(-0.6820951356608795), / NormFloat64()
float64(-0.5987943422687668), / NormFloat64()
[]int{}, / Perm(0)
[]int{0}, / Perm(1)
[]int{0, 4, 1, 3, 2}, / Perm(5)
[]int{3, 1, 0, 4, 7, 5, 2, 6}, / Perm(8)
[]int{5, 0, 3, 6, 7, 4, 2, 1, 8}, / Perm(9)
[]int{4, 5, 0, 2, 6, 9, 3, 1, 8, 7}, / Perm(10)
[]int{14, 2, 0, 8, 3, 5, 13, 12, 1, 4, 6, 7, 11, 9, 15, 10}, / Perm(16)
[]int{}, / Perm(0)
[]int{0}, / Perm(1)
[]int{3, 0, 1, 2, 4}, / Perm(5)
[]int{5, 1, 2, 0, 4, 7, 3, 6}, / Perm(8)
[]int{4, 0, 6, 8, 1, 5, 2, 7, 3}, / Perm(9)
[]int{8, 6, 1, 7, 5, 4, 3, 2, 9, 0}, / Perm(10)
[]int{0, 3, 13, 2, 15, 4, 10, 1, 8, 14, 7, 6, 12, 9, 5, 11}, / Perm(16)
[]int{}, / Perm(0)
[]int{0}, / Perm(1)
[]int{0, 4, 2, 1, 3}, / Perm(5)
[]int{2, 1, 7, 0, 6, 3, 4, 5}, / Perm(8)
[]int{8, 7, 5, 3, 4, 6, 0, 1, 2}, / Perm(9)
[]int{1, 0, 2, 5, 7, 6, 9, 8, 3, 4}, / Perm(10)
[]byte{0x1}, / Read([0])
[]byte{0x94, 0xfd, 0xc2, 0xfa, 0x2f, 0xfc, 0xc0}, / Read([0 0 0 0 0 0 0])
[]byte{0x41, 0xd3, 0xff, 0x12, 0x4, 0x5b, 0x73, 0xc8}, / Read([0 0 0 0 0 0 0 0])
[]byte{0x6e, 0x4f, 0xf9, 0x5f, 0xf6, 0x62, 0xa5, 0xee, 0xe8}, / Read([0 0 0 0 0 0 0 0 0])
[]byte{0x2a, 0xbd, 0xf4, 0x4a, 0x2d, 0xb, 0x75, 0xfb, 0x18, 0xd}, / Read([0 0 0 0 0 0 0 0 0 0])
[]byte{0xaf}, / Read([0])
[]byte{0x48, 0xa7, 0x9e, 0xe0, 0xb1, 0xd, 0x39}, / Read([0 0 0 0 0 0 0])
[]byte{0x46, 0x51, 0x85, 0xf, 0xd4, 0xa1, 0x78, 0x89}, / Read([0 0 0 0 0 0 0 0])
[]byte{0x2e, 0xe2, 0x85, 0xec, 0xe1, 0x51, 0x14, 0x55, 0x78}, / Read([0 0 0 0 0 0 0 0 0])
[]byte{0x8, 0x75, 0xd6, 0x4e, 0xe2, 0xd3, 0xd0, 0xd0, 0xde, 0x6b}, / Read([0 0 0 0 0 0 0 0 0 0])
[]byte{0xf8}, / Read([0])
[]byte{0xf9, 0xb4, 0x4c, 0xe8, 0x5f, 0xf0, 0x44}, / Read([0 0 0 0 0 0 0])
[]byte{0xc6, 0xb1, 0xf8, 0x3b, 0x8e, 0x88, 0x3b, 0xbf}, / Read([0 0 0 0 0 0 0 0])
[]byte{0x85, 0x7a, 0xab, 0x99, 0xc5, 0xb2, 0x52, 0xc7, 0x42}, / Read([0 0 0 0 0 0 0 0 0])
[]byte{0x9c, 0x32, 0xf3, 0xa8, 0xae, 0xb7, 0x9e, 0xf8, 0x56, 0xf6}, / Read([0 0 0 0 0 0 0 0 0 0])
[]byte{0x59}, / Read([0])
[]byte{0xc1, 0x8f, 0xd, 0xce, 0xcc, 0x77, 0xc7}, / Read([0 0 0 0 0 0 0])
[]byte{0x5e, 0x7a, 0x81, 0xbf, 0xde, 0x27, 0x5f, 0x67}, / Read([0 0 0 0 0 0 0 0])
[]byte{0xcf, 0xe2, 0x42, 0xcf, 0x3c, 0xc3, 0x54, 0xf3, 0xed}, / Read([0 0 0 0 0 0 0 0 0])
[]byte{0xe2, 0xd6, 0xbe, 0xcc, 0x4e, 0xa3, 0xae, 0x5e, 0x88, 0x52}, / Read([0 0 0 0 0 0 0 0 0 0])
uint32(4059586549), / Uint32()
uint32(1052117029), / Uint32()
uint32(2817310706), / Uint32()
uint32(233405013), / Uint32()
uint32(1578775030), / Uint32()
uint32(1243308993), / Uint32()
uint32(826517535), / Uint32()
uint32(2814630155), / Uint32()
uint32(3853314576), / Uint32()
uint32(718781857), / Uint32()
uint32(1239465936), / Uint32()
uint32(3876658295), / Uint32()
uint32(3649778518), / Uint32()
uint32(1172727096), / Uint32()
uint32(2615979505), / Uint32()
uint32(1089444252), / Uint32()
uint32(3327114623), / Uint32()
uint32(75079301), / Uint32()
uint32(3380456901), / Uint32()
uint32(3433369789), / Uint32()
uint64(8717895732742165505), / Uint64()
uint64(2259404117704393152), / Uint64()
uint64(6050128673802995827), / Uint64()
uint64(9724605487393973602), / Uint64()
uint64(12613765599614152010), / Uint64()
uint64(11893357769247901871), / Uint64()
uint64(1774932891286980153), / Uint64()
uint64(15267744271532198264), / Uint64()
uint64(17498302081433670737), / Uint64()
uint64(1543572285742637646), / Uint64()
uint64(11885104867954719224), / Uint64()
uint64(17548432336275752516), / Uint64()
uint64(7837839688282259259), / Uint64()
uint64(2518412263346885298), / Uint64()
uint64(5617773211005988520), / Uint64()
uint64(11562935753659892057), / Uint64()
uint64(16368296284793757383), / Uint64()
uint64(161231572858529631), / Uint64()
uint64(16482847956365694147), / Uint64()
uint64(16596477517051940556), / Uint64()
}