func testWatch(t *testing.T, kv store.Store) {
key := "testWatch"
value := []byte("world")
newValue := []byte("world!")
// Put the key
err := kv.Put(key, value, nil)
assert.NoError(t, err)
stopCh := make(<-chan struct{})
events, err := kv.Watch(key, stopCh)
assert.NoError(t, err)
assert.NotNil(t, events)
// Update loop
go func() {
timeout := time.After(1 * time.Second)
tick := time.Tick(250 * time.Millisecond)
for {
select {
case <-timeout:
return
case <-tick:
err := kv.Put(key, newValue, nil)
if assert.NoError(t, err) {
continue
}
return
}
}
}()
// Check for updates
eventCount := 1
for {
select {
case event := <-events:
assert.NotNil(t, event)
if eventCount == 1 {
assert.Equal(t, event.Key, key)
assert.Equal(t, event.Value, value)
} else {
assert.Equal(t, event.Key, key)
assert.Equal(t, event.Value, newValue)
}
eventCount++
// We received all the events we wanted to check
if eventCount >= 4 {
return
}
case <-time.After(4 * time.Second):
t.Fatal("Timeout reached")
return
}
}
}