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regress_test.go
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// Copied from https://cs.opensource.google/go/x/exp/+/24438e51023af3bfc1db8aed43c1342817e8cfcd: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.
//
// If the generator changes, the golden outputs need updating, and
// client programs may break. Although the desire for compatibility
// is not as stringent as in the original math/rand package,
// when possible avoid changing the generator.
package rand_test
import (
"flag"
"fmt"
"reflect"
"testing"
. "go.mongodb.org/mongo-driver/v2/internal/rand"
)
var printgolden = flag.Bool("printgolden", false, "print golden results for regression test")
// TestSource verifies that the output of the default Source is locked down.
func TestSourceRegress(t *testing.T) {
src := NewSource(1)
var got [20]uint64
for i := range got {
got[i] = src.Uint64()
}
want := [20]uint64{
0x34e936394905d167,
0x817c0ef62fe4c731,
0x937987e6e24f5a40,
0x0c0a8307fe226199,
0xf96363568d8bab56,
0xbaef3af36bd02620,
0x8f18e416eb6b936b,
0x05a43fc149f3a67a,
0xdab012eb3ce01697,
0xf76c495a133c6aa9,
0x304b24c5040ce457,
0x47d77e0abb413159,
0x52a810fa9e452f04,
0x2d24b66380cf4780,
0x5ec7691b92018ef5,
0x5076dfa749261ea0,
0xac8f11ad3941d213,
0x13fa8d67de91db25,
0xb50883a9893274eb,
0xeb8f59263f9109ac,
}
if got != want {
t.Errorf("got:\n\t%#016x\nwant:\n\t%#016x", got, want)
if *printgolden {
for _, x := range got {
fmt.Printf("\t\t%#016x,\n", x)
}
}
}
}
// TestRegress validates that the output stream is locked down, for instance so
// optimizations do not change the output. It iterates over methods of the
// Rand type to find functions to evaluate and checks the first 20 results
// against the golden results.
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 uint64s = []uint64{1, 10, 32, 1 << 20, 1<<20 + 1, 1000000000, 1 << 30, 1<<31 - 2, 1<<31 - 1, 1000000000000000000, 1 << 60, 1<<64 - 2, 1<<64 - 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)
if *printgolden && i > 0 {
fmt.Println()
}
for repeat := 0; repeat < 20; repeat++ {
var args []reflect.Value
var argstr string
if mt.NumIn() == 1 {
var x interface{}
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.Uint64:
x = uint64s[repeat%len(uint64s)]
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 interface{}
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 = []interface{}{
float64(0.6279600685109523), // ExpFloat64()
float64(0.16198826513357806), // ExpFloat64()
float64(0.007880404652650552), // ExpFloat64()
float64(0.41649788761745654), // ExpFloat64()
float64(1.6958707787276301), // ExpFloat64()
float64(2.7227327706138036), // ExpFloat64()
float64(2.4235600263079657), // ExpFloat64()
float64(1.277967771105418), // ExpFloat64()
float64(0.7111660437031769), // ExpFloat64()
float64(0.23090401427981888), // ExpFloat64()
float64(1.4746763588379928), // ExpFloat64()
float64(1.4868726779832278), // ExpFloat64()
float64(0.1686257242078103), // ExpFloat64()
float64(0.2732721816228957), // ExpFloat64()
float64(0.4644536065869748), // ExpFloat64()
float64(0.01319850986379164), // ExpFloat64()
float64(0.7184492551742854), // ExpFloat64()
float64(0.1913536422195827), // ExpFloat64()
float64(0.16034475958495667), // ExpFloat64()
float64(0.40599859014785644), // ExpFloat64()
float32(0.7979972), // Float32()
float32(0.7725961), // Float32()
float32(0.21894403), // Float32()
float32(0.96194494), // Float32()
float32(0.2915732), // Float32()
float32(0.59569645), // Float32()
float32(0.99596655), // Float32()
float32(0.4979039), // Float32()
float32(0.98148686), // Float32()
float32(0.01380035), // Float32()
float32(0.086487144), // Float32()
float32(0.6114401), // Float32()
float32(0.71081316), // Float32()
float32(0.6342346), // Float32()
float32(0.008082573), // Float32()
float32(0.33020085), // Float32()
float32(0.032625034), // Float32()
float32(0.9278005), // Float32()
float32(0.34497985), // Float32()
float32(0.66506875), // Float32()
float64(0.797997151016231), // Float64()
float64(0.7725961454373316), // Float64()
float64(0.21894402538580782), // Float64()
float64(0.9619449481780457), // Float64()
float64(0.2915731877602916), // Float64()
float64(0.5956964580775652), // Float64()
float64(0.9959665347028619), // Float64()
float64(0.49790390966591147), // Float64()
float64(0.9814868602566785), // Float64()
float64(0.013800350332924483), // Float64()
float64(0.08648714463652596), // Float64()
float64(0.6114401479210267), // Float64()
float64(0.7108131531183706), // Float64()
float64(0.6342346133706837), // Float64()
float64(0.008082572853887138), // Float64()
float64(0.3302008651926287), // Float64()
float64(0.03262503454637655), // Float64()
float64(0.9278004634858956), // Float64()
float64(0.3449798628384906), // Float64()
float64(0.665068719316529), // Float64()
int64(5474557666971700975), // Int()
int64(5591422465364813936), // Int()
int64(74029666500212977), // Int()
int64(8088122161323000979), // Int()
int64(7298457654139700474), // Int()
int64(1590632625527662686), // Int()
int64(9052198920789078554), // Int()
int64(7381380909356947872), // Int()
int64(1738222704626512495), // Int()
int64(3278744831230954970), // Int()
int64(7062423222661652521), // Int()
int64(6715870808026712034), // Int()
int64(528819992478005418), // Int()
int64(2284534088986354339), // Int()
int64(945828723091990082), // Int()
int64(3813019469742317492), // Int()
int64(1369388146907482806), // Int()
int64(7367238674766648970), // Int()
int64(8217673022687244206), // Int()
int64(3185531743396549562), // Int()
int32(1711064216), // Int31()
int32(650927245), // Int31()
int32(8618187), // Int31()
int32(941581344), // Int31()
int32(1923394120), // Int31()
int32(1258915833), // Int31()
int32(1053814650), // Int31()
int32(859305834), // Int31()
int32(1276097579), // Int31()
int32(1455437958), // Int31()
int32(1895916096), // Int31()
int32(781830261), // Int31()
int32(61562749), // Int31()
int32(265954771), // Int31()
int32(1183850779), // Int31()
int32(443893888), // Int31()
int32(1233159585), // Int31()
int32(857659461), // Int31()
int32(956663049), // Int31()
int32(370844703), // Int31()
int32(0), // Int31n(1)
int32(6), // Int31n(10)
int32(17), // Int31n(32)
int32(1000595), // Int31n(1048576)
int32(424333), // Int31n(1048577)
int32(382438494), // Int31n(1000000000)
int32(902738458), // Int31n(1073741824)
int32(1204933878), // Int31n(2147483646)
int32(1376191263), // Int31n(2147483647)
int32(0), // Int31n(1)
int32(9), // Int31n(10)
int32(2), // Int31n(32)
int32(440490), // Int31n(1048576)
int32(176312), // Int31n(1048577)
int32(946765890), // Int31n(1000000000)
int32(665034676), // Int31n(1073741824)
int32(1947285452), // Int31n(2147483646)
int32(1702344608), // Int31n(2147483647)
int32(0), // Int31n(1)
int32(2), // Int31n(10)
int64(5474557666971700975), // Int63()
int64(5591422465364813936), // Int63()
int64(74029666500212977), // Int63()
int64(8088122161323000979), // Int63()
int64(7298457654139700474), // Int63()
int64(1590632625527662686), // Int63()
int64(9052198920789078554), // Int63()
int64(7381380909356947872), // Int63()
int64(1738222704626512495), // Int63()
int64(3278744831230954970), // Int63()
int64(7062423222661652521), // Int63()
int64(6715870808026712034), // Int63()
int64(528819992478005418), // Int63()
int64(2284534088986354339), // Int63()
int64(945828723091990082), // Int63()
int64(3813019469742317492), // Int63()
int64(1369388146907482806), // Int63()
int64(7367238674766648970), // Int63()
int64(8217673022687244206), // Int63()
int64(3185531743396549562), // Int63()
int64(0), // Int63n(1)
int64(6), // Int63n(10)
int64(17), // Int63n(32)
int64(1000595), // Int63n(1048576)
int64(424333), // Int63n(1048577)
int64(382438494), // Int63n(1000000000)
int64(902738458), // Int63n(1073741824)
int64(1204933878), // Int63n(2147483646)
int64(1376191263), // Int63n(2147483647)
int64(502116868085730778), // Int63n(1000000000000000000)
int64(144894195020570665), // Int63n(1152921504606846976)
int64(6715870808026712034), // Int63n(9223372036854775806)
int64(528819992478005418), // Int63n(9223372036854775807)
int64(0), // Int63n(1)
int64(0), // Int63n(10)
int64(20), // Int63n(32)
int64(854710), // Int63n(1048576)
int64(649893), // Int63n(1048577)
int64(687244206), // Int63n(1000000000)
int64(836883386), // Int63n(1073741824)
int64(0), // Intn(1)
int64(6), // Intn(10)
int64(17), // Intn(32)
int64(1000595), // Intn(1048576)
int64(424333), // Intn(1048577)
int64(382438494), // Intn(1000000000)
int64(902738458), // Intn(1073741824)
int64(1204933878), // Intn(2147483646)
int64(1376191263), // Intn(2147483647)
int64(502116868085730778), // Intn(1000000000000000000)
int64(144894195020570665), // Intn(1152921504606846976)
int64(6715870808026712034), // Intn(9223372036854775806)
int64(528819992478005418), // Intn(9223372036854775807)
int64(0), // Intn(1)
int64(0), // Intn(10)
int64(20), // Intn(32)
int64(854710), // Intn(1048576)
int64(649893), // Intn(1048577)
int64(687244206), // Intn(1000000000)
int64(836883386), // Intn(1073741824)
float64(-0.5410658516792047), // NormFloat64()
float64(0.615296849055287), // NormFloat64()
float64(0.007477442280032887), // NormFloat64()
float64(1.3443892057169684), // NormFloat64()
float64(-0.17508902754863512), // NormFloat64()
float64(-2.03494397556937), // NormFloat64()
float64(2.5213558871972306), // NormFloat64()
float64(1.4572921639613627), // NormFloat64()
float64(-1.5164961164210644), // NormFloat64()
float64(-0.4861150771891445), // NormFloat64()
float64(-0.8699409548614199), // NormFloat64()
float64(1.6271559815452794), // NormFloat64()
float64(0.1659465769926195), // NormFloat64()
float64(0.2921716191987018), // NormFloat64()
float64(-1.2550269636927838), // NormFloat64()
float64(0.11257973349467548), // NormFloat64()
float64(0.5437525915836436), // NormFloat64()
float64(0.781754430770282), // NormFloat64()
float64(0.5201256313962235), // NormFloat64()
float64(1.3826174159276245), // NormFloat64()
[]int{}, // Perm(0)
[]int{0}, // Perm(1)
[]int{0, 2, 3, 1, 4}, // Perm(5)
[]int{5, 6, 3, 7, 4, 2, 0, 1}, // Perm(8)
[]int{8, 4, 5, 2, 7, 3, 0, 6, 1}, // Perm(9)
[]int{6, 1, 5, 3, 2, 9, 7, 0, 8, 4}, // Perm(10)
[]int{12, 5, 1, 9, 15, 7, 13, 6, 10, 11, 8, 0, 4, 2, 14, 3}, // Perm(16)
[]int{}, // Perm(0)
[]int{0}, // Perm(1)
[]int{0, 2, 3, 4, 1}, // Perm(5)
[]int{3, 2, 7, 4, 0, 6, 5, 1}, // Perm(8)
[]int{0, 6, 2, 1, 3, 7, 5, 8, 4}, // Perm(9)
[]int{2, 5, 6, 4, 7, 3, 0, 8, 1, 9}, // Perm(10)
[]int{3, 6, 5, 4, 9, 15, 13, 7, 1, 11, 10, 8, 12, 0, 2, 14}, // Perm(16)
[]int{}, // Perm(0)
[]int{0}, // Perm(1)
[]int{2, 4, 3, 1, 0}, // Perm(5)
[]int{1, 6, 7, 5, 4, 3, 2, 0}, // Perm(8)
[]int{7, 6, 8, 2, 0, 1, 3, 4, 5}, // Perm(9)
[]int{2, 9, 7, 1, 5, 4, 0, 6, 8, 3}, // Perm(10)
[]byte{0xef}, // Read([0])
[]byte{0x4e, 0x3d, 0x52, 0x31, 0x89, 0xf9, 0xcb}, // Read([0 0 0 0 0 0 0])
[]byte{0x70, 0x68, 0x35, 0x8d, 0x1b, 0xb9, 0x98, 0x4d}, // Read([0 0 0 0 0 0 0 0])
[]byte{0xf1, 0xf8, 0x95, 0xe6, 0x96, 0x1, 0x7, 0x1, 0x93}, // Read([0 0 0 0 0 0 0 0 0])
[]byte{0x44, 0x9f, 0xc5, 0x40, 0xc8, 0x3e, 0x70, 0xfa, 0x44, 0x3a}, // Read([0 0 0 0 0 0 0 0 0 0])
[]byte{0x4b}, // Read([0])
[]byte{0x91, 0x54, 0x49, 0xe5, 0x5e, 0x28, 0xb9}, // Read([0 0 0 0 0 0 0])
[]byte{0x4, 0xf2, 0xf, 0x13, 0x96, 0x1a, 0xb2, 0xce}, // Read([0 0 0 0 0 0 0 0])
[]byte{0x35, 0xf5, 0xde, 0x9f, 0x7d, 0xa0, 0x19, 0x12, 0x2e}, // Read([0 0 0 0 0 0 0 0 0])
[]byte{0xd4, 0xee, 0x6f, 0x66, 0x6f, 0x32, 0xc8, 0x21, 0x57, 0x68}, // Read([0 0 0 0 0 0 0 0 0 0])
[]byte{0x1f}, // Read([0])
[]byte{0x98, 0xda, 0x4d, 0xab, 0x6e, 0xd, 0x71}, // Read([0 0 0 0 0 0 0])
[]byte{0x80, 0xad, 0x29, 0xa0, 0x37, 0xb0, 0x80, 0xc4}, // Read([0 0 0 0 0 0 0 0])
[]byte{0x2, 0xe2, 0xe2, 0x7, 0xd9, 0xed, 0xea, 0x90, 0x33}, // Read([0 0 0 0 0 0 0 0 0])
[]byte{0x5d, 0xaa, 0xb8, 0xc6, 0x39, 0xfb, 0xbe, 0x56, 0x7, 0xa3}, // Read([0 0 0 0 0 0 0 0 0 0])
[]byte{0x62}, // Read([0])
[]byte{0x4d, 0x63, 0xa6, 0x4b, 0xb4, 0x1f, 0x42}, // Read([0 0 0 0 0 0 0])
[]byte{0x66, 0x42, 0x62, 0x36, 0x42, 0x20, 0x8d, 0xb4}, // Read([0 0 0 0 0 0 0 0])
[]byte{0x9f, 0xa3, 0x67, 0x1, 0x91, 0xea, 0x34, 0xb6, 0xa}, // Read([0 0 0 0 0 0 0 0 0])
[]byte{0xd, 0xa8, 0x43, 0xb, 0x1, 0x93, 0x8a, 0x56, 0xfc, 0x98}, // Read([0 0 0 0 0 0 0 0 0 0])
uint32(3422128433), // Uint32()
uint32(1301854491), // Uint32()
uint32(17236374), // Uint32()
uint32(1883162688), // Uint32()
uint32(3846788241), // Uint32()
uint32(2517831666), // Uint32()
uint32(2107629301), // Uint32()
uint32(1718611668), // Uint32()
uint32(2552195159), // Uint32()
uint32(2910875917), // Uint32()
uint32(3791832192), // Uint32()
uint32(1563660522), // Uint32()
uint32(123125499), // Uint32()
uint32(531909542), // Uint32()
uint32(2367701558), // Uint32()
uint32(887787777), // Uint32()
uint32(2466319171), // Uint32()
uint32(1715318922), // Uint32()
uint32(1913326099), // Uint32()
uint32(741689406), // Uint32()
uint64(14697929703826476783), // Uint64()
uint64(5591422465364813936), // Uint64()
uint64(74029666500212977), // Uint64()
uint64(8088122161323000979), // Uint64()
uint64(16521829690994476282), // Uint64()
uint64(10814004662382438494), // Uint64()
uint64(9052198920789078554), // Uint64()
uint64(7381380909356947872), // Uint64()
uint64(10961594741481288303), // Uint64()
uint64(12502116868085730778), // Uint64()
uint64(16285795259516428329), // Uint64()
uint64(6715870808026712034), // Uint64()
uint64(528819992478005418), // Uint64()
uint64(2284534088986354339), // Uint64()
uint64(10169200759946765890), // Uint64()
uint64(3813019469742317492), // Uint64()
uint64(10592760183762258614), // Uint64()
uint64(7367238674766648970), // Uint64()
uint64(8217673022687244206), // Uint64()
uint64(3185531743396549562), // Uint64()
uint64(0), // Uint64n(1)
uint64(6), // Uint64n(10)
uint64(17), // Uint64n(32)
uint64(1000595), // Uint64n(1048576)
uint64(424333), // Uint64n(1048577)
uint64(382438494), // Uint64n(1000000000)
uint64(902738458), // Uint64n(1073741824)
uint64(1204933878), // Uint64n(2147483646)
uint64(1376191263), // Uint64n(2147483647)
uint64(502116868085730778), // Uint64n(1000000000000000000)
uint64(144894195020570665), // Uint64n(1152921504606846976)
uint64(6715870808026712034), // Uint64n(18446744073709551614)
uint64(528819992478005418), // Uint64n(18446744073709551615)
uint64(0), // Uint64n(1)
uint64(0), // Uint64n(10)
uint64(20), // Uint64n(32)
uint64(854710), // Uint64n(1048576)
uint64(649893), // Uint64n(1048577)
uint64(687244206), // Uint64n(1000000000)
uint64(836883386), // Uint64n(1073741824)
}