github.com/mysteriumnetwork/node@v0.0.0-20240516044423-365054f76801/utils/random/concurrent_test.go (about)

     1  /*
     2   * Copyright (C) 2021 The "MysteriumNetwork/node" Authors.
     3   *
     4   * This program is free software: you can redistribute it and/or modify
     5   * it under the terms of the GNU General Public License as published by
     6   * the Free Software Foundation, either version 3 of the License, or
     7   * (at your option) any later version.
     8   *
     9   * This program is distributed in the hope that it will be useful,
    10   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    11   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    12   * GNU General Public License for more details.
    13   *
    14   * You should have received a copy of the GNU General Public License
    15   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    16   */
    17  
    18  package random
    19  
    20  import (
    21  	"math/rand"
    22  	"testing"
    23  )
    24  
    25  type mockRandomSource int64
    26  
    27  func (s *mockRandomSource) Seed(seed int64) {
    28  	*s = mockRandomSource(seed)
    29  }
    30  
    31  func (s *mockRandomSource) Int63() int64 {
    32  	return int64(*s)
    33  }
    34  
    35  type mockRandomSource64 int64
    36  
    37  func (s *mockRandomSource64) Seed(seed int64) {
    38  	*s = mockRandomSource64(seed)
    39  }
    40  
    41  func (s *mockRandomSource64) Int63() int64 {
    42  	return int64(*s)
    43  }
    44  
    45  func (s *mockRandomSource64) Uint64() uint64 {
    46  	return uint64(*s)
    47  }
    48  
    49  func TestVirtualConstructor(t *testing.T) {
    50  	src := new(mockRandomSource)
    51  	src64 := new(mockRandomSource64)
    52  
    53  	cSrc := NewConcurrentRandomSource(src)
    54  	cSrc64 := NewConcurrentRandomSource(src64)
    55  
    56  	// Generated by fair dice roll
    57  	var seed int64 = 4
    58  	cSrc.Seed(seed)
    59  	cSrc64.Seed(seed)
    60  
    61  	_, ok := cSrc.(rand.Source64)
    62  	if ok {
    63  		t.Errorf("%T exposes unexpected interface", cSrc)
    64  	}
    65  
    66  	cSrc64Extended, ok := cSrc64.(rand.Source64)
    67  	if !ok {
    68  		t.Errorf("%T exposes unexpected interface", cSrc64)
    69  	}
    70  
    71  	if cSrc.Int63() != seed {
    72  		t.Errorf("Wrapped %T returned unexpected value", cSrc)
    73  	}
    74  
    75  	if cSrc64.Int63() != seed {
    76  		t.Errorf("Wrapped %T returned unexpected value", cSrc)
    77  	}
    78  
    79  	if cSrc64Extended.Uint64() != uint64(seed) {
    80  		t.Errorf("Wrapped %T returned unexpected value", cSrc64Extended)
    81  	}
    82  }