| // Copyright 2023 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. |
| |
| package rand_test |
| |
| import ( |
| . "math/rand/v2" |
| "testing" |
| ) |
| |
| func BenchmarkPCG_DXSM(b *testing.B) { |
| var p PCG |
| var t uint64 |
| for n := b.N; n > 0; n-- { |
| t += p.Uint64() |
| } |
| Sink = t |
| } |
| |
| func TestPCGMarshal(t *testing.T) { |
| var p PCG |
| const ( |
| seed1 = 0x123456789abcdef0 |
| seed2 = 0xfedcba9876543210 |
| want = "pcg:\x12\x34\x56\x78\x9a\xbc\xde\xf0\xfe\xdc\xba\x98\x76\x54\x32\x10" |
| ) |
| p.Seed(seed1, seed2) |
| data, err := p.MarshalBinary() |
| if string(data) != want || err != nil { |
| t.Errorf("MarshalBinary() = %q, %v, want %q, nil", data, err, want) |
| } |
| |
| q := PCG{} |
| if err := q.UnmarshalBinary([]byte(want)); err != nil { |
| t.Fatalf("UnmarshalBinary(): %v", err) |
| } |
| if q != p { |
| t.Fatalf("after round trip, q = %#x, but p = %#x", q, p) |
| } |
| |
| qu := q.Uint64() |
| pu := p.Uint64() |
| if qu != pu { |
| t.Errorf("after round trip, q.Uint64() = %#x, but p.Uint64() = %#x", qu, pu) |
| } |
| } |
| |
| func TestPCG(t *testing.T) { |
| p := NewPCG(1, 2) |
| want := []uint64{ |
| 0xc4f5a58656eef510, |
| 0x9dcec3ad077dec6c, |
| 0xc8d04605312f8088, |
| 0xcbedc0dcb63ac19a, |
| 0x3bf98798cae97950, |
| 0xa8c6d7f8d485abc, |
| 0x7ffa3780429cd279, |
| 0x730ad2626b1c2f8e, |
| 0x21ff2330f4a0ad99, |
| 0x2f0901a1947094b0, |
| 0xa9735a3cfbe36cef, |
| 0x71ddb0a01a12c84a, |
| 0xf0e53e77a78453bb, |
| 0x1f173e9663be1e9d, |
| 0x657651da3ac4115e, |
| 0xc8987376b65a157b, |
| 0xbb17008f5fca28e7, |
| 0x8232bd645f29ed22, |
| 0x12be8f07ad14c539, |
| 0x54908a48e8e4736e, |
| } |
| |
| for i, x := range want { |
| if u := p.Uint64(); u != x { |
| t.Errorf("PCG #%d = %#x, want %#x", i, u, x) |
| } |
| } |
| } |