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package pubsub
import (
"context"
"sync"
"testing"
"time"
"github.com/stretchr/testify/assert"
)
func TestBrokerSubscribe(t *testing.T) {
t.Parallel()
t.Run("with cancellable context", func(t *testing.T) {
t.Parallel()
broker := NewBroker[string]()
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
ch := broker.Subscribe(ctx)
assert.NotNil(t, ch)
assert.Equal(t, 1, broker.GetSubscriberCount())
// Cancel the context should remove the subscription
cancel()
time.Sleep(10 * time.Millisecond) // Give time for goroutine to process
assert.Equal(t, 0, broker.GetSubscriberCount())
})
t.Run("with background context", func(t *testing.T) {
t.Parallel()
broker := NewBroker[string]()
// Using context.Background() should not leak goroutines
ch := broker.Subscribe(context.Background())
assert.NotNil(t, ch)
assert.Equal(t, 1, broker.GetSubscriberCount())
// Shutdown should clean up all subscriptions
broker.Shutdown()
assert.Equal(t, 0, broker.GetSubscriberCount())
})
}
func TestBrokerPublish(t *testing.T) {
t.Parallel()
broker := NewBroker[string]()
ctx := t.Context()
ch := broker.Subscribe(ctx)
// Publish a message
broker.Publish(EventTypeCreated, "test message")
// Verify message is received
select {
case event := <-ch:
assert.Equal(t, EventTypeCreated, event.Type)
assert.Equal(t, "test message", event.Payload)
case <-time.After(100 * time.Millisecond):
t.Fatal("timeout waiting for message")
}
}
func TestBrokerShutdown(t *testing.T) {
t.Parallel()
broker := NewBroker[string]()
// Create multiple subscribers
ch1 := broker.Subscribe(context.Background())
ch2 := broker.Subscribe(context.Background())
assert.Equal(t, 2, broker.GetSubscriberCount())
// Shutdown should close all channels and clean up
broker.Shutdown()
// Verify channels are closed
_, ok1 := <-ch1
_, ok2 := <-ch2
assert.False(t, ok1, "channel 1 should be closed")
assert.False(t, ok2, "channel 2 should be closed")
// Verify subscriber count is reset
assert.Equal(t, 0, broker.GetSubscriberCount())
}
func TestBrokerConcurrency(t *testing.T) {
t.Parallel()
broker := NewBroker[int]()
// Create a large number of subscribers
const numSubscribers = 100
var wg sync.WaitGroup
wg.Add(numSubscribers)
// Create a channel to collect received events
receivedEvents := make(chan int, numSubscribers)
for i := range numSubscribers {
go func(id int) {
defer wg.Done()
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
ch := broker.Subscribe(ctx)
// Receive one message then cancel
select {
case event := <-ch:
receivedEvents <- event.Payload
case <-time.After(1 * time.Second):
t.Errorf("timeout waiting for message %d", id)
}
cancel()
}(i)
}
// Give subscribers time to set up
time.Sleep(10 * time.Millisecond)
// Publish messages to all subscribers
for i := range numSubscribers {
broker.Publish(EventTypeCreated, i)
}
// Wait for all subscribers to finish
wg.Wait()
close(receivedEvents)
// Give time for cleanup goroutines to run
time.Sleep(10 * time.Millisecond)
// Verify all subscribers are cleaned up
assert.Equal(t, 0, broker.GetSubscriberCount())
// Verify we received the expected number of events
count := 0
for range receivedEvents {
count++
}
assert.Equal(t, numSubscribers, count)
}
|
