storj.io/minio@v0.0.0-20230509071714-0cbc90f649b1/pkg/pubsub/pubsub_test.go (about)

     1  /*
     2   * MinIO Cloud Storage, (C) 2019 MinIO, Inc.
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package pubsub
    18  
    19  import (
    20  	"fmt"
    21  	"testing"
    22  	"time"
    23  )
    24  
    25  func TestSubscribe(t *testing.T) {
    26  	ps := New()
    27  	ch1 := make(chan interface{}, 1)
    28  	ch2 := make(chan interface{}, 1)
    29  	doneCh := make(chan struct{})
    30  	defer close(doneCh)
    31  	ps.Subscribe(ch1, doneCh, nil)
    32  	ps.Subscribe(ch2, doneCh, nil)
    33  	ps.Lock()
    34  	defer ps.Unlock()
    35  	if len(ps.subs) != 2 {
    36  		t.Errorf("expected 2 subscribers")
    37  	}
    38  }
    39  
    40  func TestUnsubscribe(t *testing.T) {
    41  	ps := New()
    42  	ch1 := make(chan interface{}, 1)
    43  	ch2 := make(chan interface{}, 1)
    44  	doneCh1 := make(chan struct{})
    45  	doneCh2 := make(chan struct{})
    46  	ps.Subscribe(ch1, doneCh1, nil)
    47  	ps.Subscribe(ch2, doneCh2, nil)
    48  
    49  	close(doneCh1)
    50  	// Allow for the above statement to take effect.
    51  	time.Sleep(100 * time.Millisecond)
    52  	ps.Lock()
    53  	if len(ps.subs) != 1 {
    54  		t.Errorf("expected 1 subscriber")
    55  	}
    56  	ps.Unlock()
    57  	close(doneCh2)
    58  }
    59  
    60  func TestPubSub(t *testing.T) {
    61  	ps := New()
    62  	ch1 := make(chan interface{}, 1)
    63  	doneCh1 := make(chan struct{})
    64  	defer close(doneCh1)
    65  	ps.Subscribe(ch1, doneCh1, func(entry interface{}) bool { return true })
    66  	val := "hello"
    67  	ps.Publish(val)
    68  	msg := <-ch1
    69  	if msg != "hello" {
    70  		t.Errorf(fmt.Sprintf("expected %s , found %s", val, msg))
    71  	}
    72  }
    73  
    74  func TestMultiPubSub(t *testing.T) {
    75  	ps := New()
    76  	ch1 := make(chan interface{}, 1)
    77  	ch2 := make(chan interface{}, 1)
    78  	doneCh := make(chan struct{})
    79  	defer close(doneCh)
    80  	ps.Subscribe(ch1, doneCh, func(entry interface{}) bool { return true })
    81  	ps.Subscribe(ch2, doneCh, func(entry interface{}) bool { return true })
    82  	val := "hello"
    83  	ps.Publish(val)
    84  
    85  	msg1 := <-ch1
    86  	msg2 := <-ch2
    87  	if msg1 != "hello" && msg2 != "hello" {
    88  		t.Errorf(fmt.Sprintf("expected both subscribers to have%s , found %s and  %s", val, msg1, msg2))
    89  	}
    90  }