github.com/mdempsky/go@v0.0.0-20151201204031-5dd372bd1e70/src/math/rand/regress_test.go (about)

     1  // Copyright 2014 The Go Authors.  All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // Test that random number sequences generated by a specific seed
     6  // do not change from version to version.
     7  //
     8  // Do NOT make changes to the golden outputs. If bugs need to be fixed
     9  // in the underlying code, find ways to fix them that do not affect the
    10  // outputs.
    11  
    12  package rand_test
    13  
    14  import (
    15  	"flag"
    16  	"fmt"
    17  	. "math/rand"
    18  	"reflect"
    19  	"testing"
    20  )
    21  
    22  var printgolden = flag.Bool("printgolden", false, "print golden results for regression test")
    23  
    24  func TestRegress(t *testing.T) {
    25  	var int32s = []int32{1, 10, 32, 1 << 20, 1<<20 + 1, 1000000000, 1 << 30, 1<<31 - 2, 1<<31 - 1}
    26  	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}
    27  	var permSizes = []int{0, 1, 5, 8, 9, 10, 16}
    28  	var readBufferSizes = []int{1, 7, 8, 9, 10}
    29  	r := New(NewSource(0))
    30  
    31  	rv := reflect.ValueOf(r)
    32  	n := rv.NumMethod()
    33  	p := 0
    34  	if *printgolden {
    35  		fmt.Printf("var regressGolden = []interface{}{\n")
    36  	}
    37  	for i := 0; i < n; i++ {
    38  		m := rv.Type().Method(i)
    39  		mv := rv.Method(i)
    40  		mt := mv.Type()
    41  		if mt.NumOut() == 0 {
    42  			continue
    43  		}
    44  		r.Seed(0)
    45  		for repeat := 0; repeat < 20; repeat++ {
    46  			var args []reflect.Value
    47  			var argstr string
    48  			if mt.NumIn() == 1 {
    49  				var x interface{}
    50  				switch mt.In(0).Kind() {
    51  				default:
    52  					t.Fatalf("unexpected argument type for r.%s", m.Name)
    53  
    54  				case reflect.Int:
    55  					if m.Name == "Perm" {
    56  						x = permSizes[repeat%len(permSizes)]
    57  						break
    58  					}
    59  					big := int64s[repeat%len(int64s)]
    60  					if int64(int(big)) != big {
    61  						r.Int63n(big) // what would happen on 64-bit machine, to keep stream in sync
    62  						if *printgolden {
    63  							fmt.Printf("\tskipped, // must run printgolden on 64-bit machine\n")
    64  						}
    65  						p++
    66  						continue
    67  					}
    68  					x = int(big)
    69  
    70  				case reflect.Int32:
    71  					x = int32s[repeat%len(int32s)]
    72  
    73  				case reflect.Int64:
    74  					x = int64s[repeat%len(int64s)]
    75  
    76  				case reflect.Slice:
    77  					if m.Name == "Read" {
    78  						n := readBufferSizes[repeat%len(readBufferSizes)]
    79  						x = make([]byte, n)
    80  					}
    81  				}
    82  				argstr = fmt.Sprint(x)
    83  				args = append(args, reflect.ValueOf(x))
    84  			}
    85  
    86  			var out interface{}
    87  			out = mv.Call(args)[0].Interface()
    88  			if m.Name == "Int" || m.Name == "Intn" {
    89  				out = int64(out.(int))
    90  			}
    91  			if m.Name == "Read" {
    92  				out = args[0].Interface().([]byte)
    93  			}
    94  			if *printgolden {
    95  				var val string
    96  				big := int64(1 << 60)
    97  				if int64(int(big)) != big && (m.Name == "Int" || m.Name == "Intn") {
    98  					// 32-bit machine cannot print 64-bit results
    99  					val = "truncated"
   100  				} else if reflect.TypeOf(out).Kind() == reflect.Slice {
   101  					val = fmt.Sprintf("%#v", out)
   102  				} else {
   103  					val = fmt.Sprintf("%T(%v)", out, out)
   104  				}
   105  				fmt.Printf("\t%s, // %s(%s)\n", val, m.Name, argstr)
   106  			} else {
   107  				want := regressGolden[p]
   108  				if m.Name == "Int" {
   109  					want = int64(int(uint(want.(int64)) << 1 >> 1))
   110  				}
   111  				if !reflect.DeepEqual(out, want) {
   112  					t.Errorf("r.%s(%s) = %v, want %v", m.Name, argstr, out, want)
   113  				}
   114  			}
   115  			p++
   116  		}
   117  	}
   118  	if *printgolden {
   119  		fmt.Printf("}\n")
   120  	}
   121  }
   122  
   123  var regressGolden = []interface{}{
   124  	float64(4.668112973579268),    // ExpFloat64()
   125  	float64(0.1601593871172866),   // ExpFloat64()
   126  	float64(3.0465834105636),      // ExpFloat64()
   127  	float64(0.06385839451671879),  // ExpFloat64()
   128  	float64(1.8578917487258961),   // ExpFloat64()
   129  	float64(0.784676123472182),    // ExpFloat64()
   130  	float64(0.11225477361256932),  // ExpFloat64()
   131  	float64(0.20173283329802255),  // ExpFloat64()
   132  	float64(0.3468619496201105),   // ExpFloat64()
   133  	float64(0.35601103454384536),  // ExpFloat64()
   134  	float64(0.888376329507869),    // ExpFloat64()
   135  	float64(1.4081362450365698),   // ExpFloat64()
   136  	float64(1.0077753823151994),   // ExpFloat64()
   137  	float64(0.23594100766227588),  // ExpFloat64()
   138  	float64(2.777245612300007),    // ExpFloat64()
   139  	float64(0.5202997830662377),   // ExpFloat64()
   140  	float64(1.2842705247770294),   // ExpFloat64()
   141  	float64(0.030307408362776206), // ExpFloat64()
   142  	float64(2.204156824853721),    // ExpFloat64()
   143  	float64(2.09891923895058),     // ExpFloat64()
   144  	float32(0.94519615),           // Float32()
   145  	float32(0.24496509),           // Float32()
   146  	float32(0.65595627),           // Float32()
   147  	float32(0.05434384),           // Float32()
   148  	float32(0.3675872),            // Float32()
   149  	float32(0.28948045),           // Float32()
   150  	float32(0.1924386),            // Float32()
   151  	float32(0.65533215),           // Float32()
   152  	float32(0.8971697),            // Float32()
   153  	float32(0.16735445),           // Float32()
   154  	float32(0.28858566),           // Float32()
   155  	float32(0.9026048),            // Float32()
   156  	float32(0.84978026),           // Float32()
   157  	float32(0.2730468),            // Float32()
   158  	float32(0.6090802),            // Float32()
   159  	float32(0.253656),             // Float32()
   160  	float32(0.7746542),            // Float32()
   161  	float32(0.017480763),          // Float32()
   162  	float32(0.78707397),           // Float32()
   163  	float32(0.7993937),            // Float32()
   164  	float64(0.9451961492941164),   // Float64()
   165  	float64(0.24496508529377975),  // Float64()
   166  	float64(0.6559562651954052),   // Float64()
   167  	float64(0.05434383959970039),  // Float64()
   168  	float64(0.36758720663245853),  // Float64()
   169  	float64(0.2894804331565928),   // Float64()
   170  	float64(0.19243860967493215),  // Float64()
   171  	float64(0.6553321508148324),   // Float64()
   172  	float64(0.897169713149801),    // Float64()
   173  	float64(0.16735444255905835),  // Float64()
   174  	float64(0.2885856518054551),   // Float64()
   175  	float64(0.9026048462705047),   // Float64()
   176  	float64(0.8497802817628735),   // Float64()
   177  	float64(0.2730468047134829),   // Float64()
   178  	float64(0.6090801919903561),   // Float64()
   179  	float64(0.25365600644283687),  // Float64()
   180  	float64(0.7746542391859803),   // Float64()
   181  	float64(0.017480762156647272), // Float64()
   182  	float64(0.7870739563039942),   // Float64()
   183  	float64(0.7993936979594545),   // Float64()
   184  	int64(8717895732742165505),    // Int()
   185  	int64(2259404117704393152),    // Int()
   186  	int64(6050128673802995827),    // Int()
   187  	int64(501233450539197794),     // Int()
   188  	int64(3390393562759376202),    // Int()
   189  	int64(2669985732393126063),    // Int()
   190  	int64(1774932891286980153),    // Int()
   191  	int64(6044372234677422456),    // Int()
   192  	int64(8274930044578894929),    // Int()
   193  	int64(1543572285742637646),    // Int()
   194  	int64(2661732831099943416),    // Int()
   195  	int64(8325060299420976708),    // Int()
   196  	int64(7837839688282259259),    // Int()
   197  	int64(2518412263346885298),    // Int()
   198  	int64(5617773211005988520),    // Int()
   199  	int64(2339563716805116249),    // Int()
   200  	int64(7144924247938981575),    // Int()
   201  	int64(161231572858529631),     // Int()
   202  	int64(7259475919510918339),    // Int()
   203  	int64(7373105480197164748),    // Int()
   204  	int32(2029793274),             // Int31()
   205  	int32(526058514),              // Int31()
   206  	int32(1408655353),             // Int31()
   207  	int32(116702506),              // Int31()
   208  	int32(789387515),              // Int31()
   209  	int32(621654496),              // Int31()
   210  	int32(413258767),              // Int31()
   211  	int32(1407315077),             // Int31()
   212  	int32(1926657288),             // Int31()
   213  	int32(359390928),              // Int31()
   214  	int32(619732968),              // Int31()
   215  	int32(1938329147),             // Int31()
   216  	int32(1824889259),             // Int31()
   217  	int32(586363548),              // Int31()
   218  	int32(1307989752),             // Int31()
   219  	int32(544722126),              // Int31()
   220  	int32(1663557311),             // Int31()
   221  	int32(37539650),               // Int31()
   222  	int32(1690228450),             // Int31()
   223  	int32(1716684894),             // Int31()
   224  	int32(0),                      // Int31n(1)
   225  	int32(4),                      // Int31n(10)
   226  	int32(25),                     // Int31n(32)
   227  	int32(310570),                 // Int31n(1048576)
   228  	int32(857611),                 // Int31n(1048577)
   229  	int32(621654496),              // Int31n(1000000000)
   230  	int32(413258767),              // Int31n(1073741824)
   231  	int32(1407315077),             // Int31n(2147483646)
   232  	int32(1926657288),             // Int31n(2147483647)
   233  	int32(0),                      // Int31n(1)
   234  	int32(8),                      // Int31n(10)
   235  	int32(27),                     // Int31n(32)
   236  	int32(367019),                 // Int31n(1048576)
   237  	int32(209005),                 // Int31n(1048577)
   238  	int32(307989752),              // Int31n(1000000000)
   239  	int32(544722126),              // Int31n(1073741824)
   240  	int32(1663557311),             // Int31n(2147483646)
   241  	int32(37539650),               // Int31n(2147483647)
   242  	int32(0),                      // Int31n(1)
   243  	int32(4),                      // Int31n(10)
   244  	int64(8717895732742165505),    // Int63()
   245  	int64(2259404117704393152),    // Int63()
   246  	int64(6050128673802995827),    // Int63()
   247  	int64(501233450539197794),     // Int63()
   248  	int64(3390393562759376202),    // Int63()
   249  	int64(2669985732393126063),    // Int63()
   250  	int64(1774932891286980153),    // Int63()
   251  	int64(6044372234677422456),    // Int63()
   252  	int64(8274930044578894929),    // Int63()
   253  	int64(1543572285742637646),    // Int63()
   254  	int64(2661732831099943416),    // Int63()
   255  	int64(8325060299420976708),    // Int63()
   256  	int64(7837839688282259259),    // Int63()
   257  	int64(2518412263346885298),    // Int63()
   258  	int64(5617773211005988520),    // Int63()
   259  	int64(2339563716805116249),    // Int63()
   260  	int64(7144924247938981575),    // Int63()
   261  	int64(161231572858529631),     // Int63()
   262  	int64(7259475919510918339),    // Int63()
   263  	int64(7373105480197164748),    // Int63()
   264  	int64(0),                      // Int63n(1)
   265  	int64(2),                      // Int63n(10)
   266  	int64(19),                     // Int63n(32)
   267  	int64(959842),                 // Int63n(1048576)
   268  	int64(688912),                 // Int63n(1048577)
   269  	int64(393126063),              // Int63n(1000000000)
   270  	int64(89212473),               // Int63n(1073741824)
   271  	int64(834026388),              // Int63n(2147483646)
   272  	int64(1577188963),             // Int63n(2147483647)
   273  	int64(543572285742637646),     // Int63n(1000000000000000000)
   274  	int64(355889821886249464),     // Int63n(1152921504606846976)
   275  	int64(8325060299420976708),    // Int63n(9223372036854775806)
   276  	int64(7837839688282259259),    // Int63n(9223372036854775807)
   277  	int64(0),                      // Int63n(1)
   278  	int64(0),                      // Int63n(10)
   279  	int64(25),                     // Int63n(32)
   280  	int64(679623),                 // Int63n(1048576)
   281  	int64(882178),                 // Int63n(1048577)
   282  	int64(510918339),              // Int63n(1000000000)
   283  	int64(782454476),              // Int63n(1073741824)
   284  	int64(0),                      // Intn(1)
   285  	int64(4),                      // Intn(10)
   286  	int64(25),                     // Intn(32)
   287  	int64(310570),                 // Intn(1048576)
   288  	int64(857611),                 // Intn(1048577)
   289  	int64(621654496),              // Intn(1000000000)
   290  	int64(413258767),              // Intn(1073741824)
   291  	int64(1407315077),             // Intn(2147483646)
   292  	int64(1926657288),             // Intn(2147483647)
   293  	int64(543572285742637646),     // Intn(1000000000000000000)
   294  	int64(355889821886249464),     // Intn(1152921504606846976)
   295  	int64(8325060299420976708),    // Intn(9223372036854775806)
   296  	int64(7837839688282259259),    // Intn(9223372036854775807)
   297  	int64(0),                      // Intn(1)
   298  	int64(2),                      // Intn(10)
   299  	int64(14),                     // Intn(32)
   300  	int64(515775),                 // Intn(1048576)
   301  	int64(839455),                 // Intn(1048577)
   302  	int64(690228450),              // Intn(1000000000)
   303  	int64(642943070),              // Intn(1073741824)
   304  	float64(-0.28158587086436215), // NormFloat64()
   305  	float64(0.570933095808067),    // NormFloat64()
   306  	float64(-1.6920196326157044),  // NormFloat64()
   307  	float64(0.1996229111693099),   // NormFloat64()
   308  	float64(1.9195199291234621),   // NormFloat64()
   309  	float64(0.8954838794918353),   // NormFloat64()
   310  	float64(0.41457072128813166),  // NormFloat64()
   311  	float64(-0.48700161491544713), // NormFloat64()
   312  	float64(-0.1684059662402393),  // NormFloat64()
   313  	float64(0.37056410998929545),  // NormFloat64()
   314  	float64(1.0156889027029008),   // NormFloat64()
   315  	float64(-0.5174422210625114),  // NormFloat64()
   316  	float64(-0.5565834214413804),  // NormFloat64()
   317  	float64(0.778320596648391),    // NormFloat64()
   318  	float64(-1.8970718197702225),  // NormFloat64()
   319  	float64(0.5229525761688676),   // NormFloat64()
   320  	float64(-1.5515595563231523),  // NormFloat64()
   321  	float64(0.0182029289376123),   // NormFloat64()
   322  	float64(-0.6820951356608795),  // NormFloat64()
   323  	float64(-0.5987943422687668),  // NormFloat64()
   324  	[]int{},                                                     // Perm(0)
   325  	[]int{0},                                                    // Perm(1)
   326  	[]int{0, 4, 1, 3, 2},                                        // Perm(5)
   327  	[]int{3, 1, 0, 4, 7, 5, 2, 6},                               // Perm(8)
   328  	[]int{5, 0, 3, 6, 7, 4, 2, 1, 8},                            // Perm(9)
   329  	[]int{4, 5, 0, 2, 6, 9, 3, 1, 8, 7},                         // Perm(10)
   330  	[]int{14, 2, 0, 8, 3, 5, 13, 12, 1, 4, 6, 7, 11, 9, 15, 10}, // Perm(16)
   331  	[]int{},                                                     // Perm(0)
   332  	[]int{0},                                                    // Perm(1)
   333  	[]int{3, 0, 1, 2, 4},                                        // Perm(5)
   334  	[]int{5, 1, 2, 0, 4, 7, 3, 6},                               // Perm(8)
   335  	[]int{4, 0, 6, 8, 1, 5, 2, 7, 3},                            // Perm(9)
   336  	[]int{8, 6, 1, 7, 5, 4, 3, 2, 9, 0},                         // Perm(10)
   337  	[]int{0, 3, 13, 2, 15, 4, 10, 1, 8, 14, 7, 6, 12, 9, 5, 11}, // Perm(16)
   338  	[]int{},                             // Perm(0)
   339  	[]int{0},                            // Perm(1)
   340  	[]int{0, 4, 2, 1, 3},                // Perm(5)
   341  	[]int{2, 1, 7, 0, 6, 3, 4, 5},       // Perm(8)
   342  	[]int{8, 7, 5, 3, 4, 6, 0, 1, 2},    // Perm(9)
   343  	[]int{1, 0, 2, 5, 7, 6, 9, 8, 3, 4}, // Perm(10)
   344  	[]byte{0x1},                         // Read([0])
   345  	[]byte{0xc0, 0x41, 0xd3, 0xff, 0x12, 0x4, 0x5b},                   // Read([0 0 0 0 0 0 0])
   346  	[]byte{0x73, 0xc8, 0x6e, 0x4f, 0xf9, 0x5f, 0xf6, 0x62},            // Read([0 0 0 0 0 0 0 0])
   347  	[]byte{0x4a, 0x2d, 0xb, 0x75, 0xfb, 0x18, 0xd, 0xaf, 0x48},        // Read([0 0 0 0 0 0 0 0 0])
   348  	[]byte{0x39, 0x46, 0x51, 0x85, 0xf, 0xd4, 0xa1, 0x78, 0x89, 0x2e}, // Read([0 0 0 0 0 0 0 0 0 0])
   349  	[]byte{0x51}, // Read([0])
   350  	[]byte{0x4e, 0xe2, 0xd3, 0xd0, 0xd0, 0xde, 0x6b},                   // Read([0 0 0 0 0 0 0])
   351  	[]byte{0xf8, 0xf9, 0xb4, 0x4c, 0xe8, 0x5f, 0xf0, 0x44},             // Read([0 0 0 0 0 0 0 0])
   352  	[]byte{0x3b, 0xbf, 0x85, 0x7a, 0xab, 0x99, 0xc5, 0xb2, 0x52},       // Read([0 0 0 0 0 0 0 0 0])
   353  	[]byte{0xa8, 0xae, 0xb7, 0x9e, 0xf8, 0x56, 0xf6, 0x59, 0xc1, 0x8f}, // Read([0 0 0 0 0 0 0 0 0 0])
   354  	[]byte{0xc7}, // Read([0])
   355  	[]byte{0x5f, 0x67, 0xcf, 0xe2, 0x42, 0xcf, 0x3c},                   // Read([0 0 0 0 0 0 0])
   356  	[]byte{0xc3, 0x54, 0xf3, 0xed, 0xe2, 0xd6, 0xbe, 0xcc},             // Read([0 0 0 0 0 0 0 0])
   357  	[]byte{0x6a, 0x9f, 0x4a, 0x57, 0x8b, 0xcb, 0x9e, 0xf2, 0xd4},       // Read([0 0 0 0 0 0 0 0 0])
   358  	[]byte{0x6d, 0x29, 0x97, 0x61, 0xea, 0x9e, 0x4f, 0x5a, 0xa6, 0xae}, // Read([0 0 0 0 0 0 0 0 0 0])
   359  	[]byte{0xaa}, // Read([0])
   360  	[]byte{0x20, 0xef, 0xcd, 0x6c, 0xea, 0x84, 0xb6},                   // Read([0 0 0 0 0 0 0])
   361  	[]byte{0x92, 0x5e, 0x60, 0x7b, 0xe0, 0x63, 0x71, 0x6f},             // Read([0 0 0 0 0 0 0 0])
   362  	[]byte{0x4, 0x5c, 0x3f, 0x0, 0xf, 0x8a, 0x79, 0x6b, 0xce},          // Read([0 0 0 0 0 0 0 0 0])
   363  	[]byte{0xaa, 0xca, 0xee, 0xdf, 0xad, 0x5b, 0x50, 0x66, 0x64, 0xe8}, // Read([0 0 0 0 0 0 0 0 0 0])
   364  	uint32(4059586549),                                                 // Uint32()
   365  	uint32(1052117029),                                                 // Uint32()
   366  	uint32(2817310706),                                                 // Uint32()
   367  	uint32(233405013),                                                  // Uint32()
   368  	uint32(1578775030),                                                 // Uint32()
   369  	uint32(1243308993),                                                 // Uint32()
   370  	uint32(826517535),                                                  // Uint32()
   371  	uint32(2814630155),                                                 // Uint32()
   372  	uint32(3853314576),                                                 // Uint32()
   373  	uint32(718781857),                                                  // Uint32()
   374  	uint32(1239465936),                                                 // Uint32()
   375  	uint32(3876658295),                                                 // Uint32()
   376  	uint32(3649778518),                                                 // Uint32()
   377  	uint32(1172727096),                                                 // Uint32()
   378  	uint32(2615979505),                                                 // Uint32()
   379  	uint32(1089444252),                                                 // Uint32()
   380  	uint32(3327114623),                                                 // Uint32()
   381  	uint32(75079301),                                                   // Uint32()
   382  	uint32(3380456901),                                                 // Uint32()
   383  	uint32(3433369789),                                                 // Uint32()
   384  }