github.com/mysteriumnetwork/node@v0.0.0-20240516044423-365054f76801/eventbus/event_bus_test.go (about)

     1  /*
     2   * Copyright (C) 2019 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 eventbus
    19  
    20  import (
    21  	"sync"
    22  	"sync/atomic"
    23  	"testing"
    24  	"time"
    25  
    26  	"github.com/stretchr/testify/assert"
    27  )
    28  
    29  func Test_simplifiedEventBus_Publish_InvokesSubscribers(t *testing.T) {
    30  	eventBus := New()
    31  	var received string
    32  	eventBus.Subscribe("test topic", func(data string) {
    33  		received = data
    34  	})
    35  
    36  	eventBus.Publish("test topic", "test data")
    37  
    38  	assert.Equal(t, "test data", received)
    39  }
    40  
    41  type handler struct {
    42  	val int
    43  }
    44  
    45  func (h *handler) Handle(_ string) {
    46  	h.val++
    47  }
    48  
    49  func TestUnsubscribeMethod(t *testing.T) {
    50  	bus := New()
    51  	h := &handler{val: 0}
    52  	h2 := &handler{val: 5}
    53  
    54  	bus.SubscribeWithUID("topic", "1", h.Handle)
    55  	bus.SubscribeWithUID("topic", "2", h2.Handle)
    56  
    57  	bus.Publish("topic", "1")
    58  
    59  	err := bus.UnsubscribeWithUID("topic", "1", h.Handle)
    60  	assert.NoError(t, err)
    61  
    62  	bus.Publish("topic", "2")
    63  
    64  	err = bus.UnsubscribeWithUID("topic", "2", h2.Handle)
    65  	assert.NoError(t, err)
    66  
    67  	err = bus.UnsubscribeWithUID("topic", "1", h.Handle)
    68  	assert.Error(t, err)
    69  
    70  	bus.Publish("topic", "3")
    71  
    72  	assert.Equal(t, 1, h.val)
    73  	assert.Equal(t, 7, h2.val)
    74  }
    75  
    76  func Test_simplifiedEventBus_Publish_DataRace(t *testing.T) {
    77  	eventBus := New()
    78  
    79  	fn := func(data string) {}
    80  
    81  	active := new(atomic.Bool)
    82  	active.Store(true)
    83  
    84  	var wg sync.WaitGroup
    85  	wg.Add(2)
    86  
    87  	go func() {
    88  		defer wg.Done()
    89  
    90  		for i := 0; i < 100; i++ {
    91  			eventBus.SubscribeWithUID("topic", "1", fn)
    92  			eventBus.Publish("topic", "test data")
    93  			time.Sleep(time.Millisecond)
    94  		}
    95  		active.Store(false)
    96  	}()
    97  	go func() {
    98  		defer wg.Done()
    99  		for active.Load() == true {
   100  			eventBus.UnsubscribeWithUID("topic", "1", fn)
   101  			time.Sleep(time.Millisecond)
   102  		}
   103  	}()
   104  	wg.Wait()
   105  }