LK4D4 / testpoller

testpoller - Simple polling for tests

testpoller - Simple polling for tests.

Sometimes you're not sure when the event will happen, using just big sleep is one way, but it needs to be big enough to satisfy even slow machines. You can use "polling" for speeding up your tests.

testpoller calls some func repeatedly until it returns true or error. It also consumes context, which can be used to control polling time.

It's very easy to use:

p := testpoller.New().WithInterval(500 * time.Millisecond)
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Millisecond)
err := p.Poll(ctx, func() (bool, error) {
	err := cluster.IsLeader()
	if err != nil {
		if isNotLeader(err) {
			return false, nil
		}
		return false, err
	}
	return true, nil
})