github.com/livekit/protocol@v1.16.1-0.20240517185851-47e4c6bba773/utils/event_emitter_test.go (about)

     1  // Copyright 2023 LiveKit, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package utils
    16  
    17  import (
    18  	"sort"
    19  	"testing"
    20  
    21  	"github.com/stretchr/testify/require"
    22  )
    23  
    24  func TestEventEmitter(t *testing.T) {
    25  	t.Run("emitter", func(t *testing.T) {
    26  		emitter := NewDefaultEventEmitter[string, int]()
    27  		ao0 := emitter.Observe("a")
    28  		ao1 := emitter.Observe("a")
    29  		bo := emitter.Observe("b")
    30  
    31  		emitter.Emit("a", 1)
    32  		emitter.Emit("b", 2)
    33  		require.Equal(t, 1, <-ao0.Events())
    34  		require.Equal(t, 1, <-ao1.Events())
    35  		require.Equal(t, 2, <-bo.Events())
    36  
    37  		ao1.Stop()
    38  		emitter.Emit("a", 3)
    39  		require.Equal(t, 3, <-ao0.Events())
    40  		select {
    41  		case <-ao1.Events():
    42  			require.Fail(t, "expected no event from stopped observer")
    43  		default:
    44  		}
    45  
    46  		ao0.Stop()
    47  
    48  		keys := emitter.ObservedKeys()
    49  		sort.Strings(keys)
    50  		require.Equal(t, []string{"b"}, keys)
    51  	})
    52  
    53  	t.Run("observer", func(t *testing.T) {
    54  		var closeCalled bool
    55  		o, emit := NewEventObserver[int](func() { closeCalled = true })
    56  
    57  		emit(1)
    58  		require.Equal(t, 1, <-o.Events())
    59  
    60  		o.Stop()
    61  		require.True(t, closeCalled)
    62  	})
    63  }