github.com/asynkron/protoactor-go@v0.0.0-20240308120642-ef91a6abee75/eventstream/eventstream_test.go (about)

     1  package eventstream_test
     2  
     3  import (
     4  	"testing"
     5  
     6  	"github.com/asynkron/protoactor-go/eventstream"
     7  	"github.com/stretchr/testify/assert"
     8  )
     9  
    10  func TestEventStream_Subscribe(t *testing.T) {
    11  	es := &eventstream.EventStream{}
    12  	s := es.Subscribe(func(interface{}) {})
    13  	assert.NotNil(t, s)
    14  	assert.Equal(t, es.Length(), int32(1))
    15  }
    16  
    17  func TestEventStream_Unsubscribe(t *testing.T) {
    18  	es := &eventstream.EventStream{}
    19  	var c1, c2 int
    20  
    21  	s1 := es.Subscribe(func(interface{}) { c1++ })
    22  	s2 := es.Subscribe(func(interface{}) { c2++ })
    23  	assert.Equal(t, es.Length(), int32(2))
    24  
    25  	es.Unsubscribe(s2)
    26  	assert.Equal(t, es.Length(), int32(1))
    27  
    28  	es.Publish(1)
    29  	assert.Equal(t, 1, c1)
    30  
    31  	es.Unsubscribe(s1)
    32  	assert.Equal(t, es.Length(), int32(0))
    33  
    34  	es.Publish(1)
    35  	assert.Equal(t, 1, c1)
    36  	assert.Equal(t, 0, c2)
    37  }
    38  
    39  func TestEventStream_Publish(t *testing.T) {
    40  	es := &eventstream.EventStream{}
    41  
    42  	var v int
    43  	es.Subscribe(func(m interface{}) { v = m.(int) })
    44  
    45  	es.Publish(1)
    46  	assert.Equal(t, 1, v)
    47  
    48  	es.Publish(100)
    49  	assert.Equal(t, 100, v)
    50  }
    51  
    52  func TestEventStream_Subscribe_WithPredicate_IsCalled(t *testing.T) {
    53  	called := false
    54  	es := &eventstream.EventStream{}
    55  	es.SubscribeWithPredicate(
    56  		func(interface{}) { called = true },
    57  		func(m interface{}) bool { return true },
    58  	)
    59  	es.Publish("")
    60  
    61  	assert.True(t, called)
    62  }
    63  
    64  func TestEventStream_Subscribe_WithPredicate_IsNotCalled(t *testing.T) {
    65  	called := false
    66  	es := &eventstream.EventStream{}
    67  	es.SubscribeWithPredicate(
    68  		func(interface{}) { called = true },
    69  		func(m interface{}) bool { return false },
    70  	)
    71  	es.Publish("")
    72  
    73  	assert.False(t, called)
    74  }
    75  
    76  type Event struct {
    77  	i int
    78  }
    79  
    80  func BenchmarkEventStream(b *testing.B) {
    81  	es := eventstream.NewEventStream()
    82  	subs := make([]*eventstream.Subscription, 10)
    83  	for i := 0; i < b.N; i++ {
    84  		for j := 0; j < 10; j++ {
    85  			sub := es.Subscribe(func(evt interface{}) {
    86  				if e := evt.(*Event); e.i != i {
    87  					b.Fatalf("expected i to be %d but its value is %d", i, e.i)
    88  				}
    89  			})
    90  			subs[j] = sub
    91  		}
    92  
    93  		es.Publish(&Event{i: i})
    94  		for j := range subs {
    95  			es.Unsubscribe(subs[j])
    96  			if subs[j].IsActive() {
    97  				b.Fatal("subscription should not be active")
    98  			}
    99  		}
   100  	}
   101  }