context:          deadlinedContext,
			callback:         defaultCallback,
			immediate:        true,
			attemptsExpected: 1,
			errExpected:      context.DeadlineExceeded,
		},
		{
			name:             "context at deadline no attempts expected",
			context:          deadlinedContext,
			callback:         defaultCallback,
			attemptsExpected: 0,

}
func cancelledContext() (context.Context, context.CancelFunc) {
	ctx, cancel := context.WithCancel(context.Background())
	cancel()
	return ctx, cancel
}
func deadlinedContext() (context.Context, context.CancelFunc) {
	ctx, cancel := context.WithTimeout(context.Background(), time.Millisecond)
	for ctx.Err() != context.DeadlineExceeded {
		time.Sleep(501 * time.Microsecond)
	}