package gensupport import ( "testing" "time" ) func TestBackoff(t *testing.T) { eb := &ExponentialBackoff{Base: time.Millisecond, Max: time.Second} var total time.Duration for n, max := 0, 2*time.Millisecond; ; n, max = n+1, max*2 { if n > 100 { // There's less than 1 in 10^28 of taking longer than 100 iterations, // so this is just to check we don't have an infinite loop. t.Fatalf("Failed to timeout after 100 iterations.") } pause, retry := eb.Pause() if !retry { break } if 0 > pause || pause >= max { t.Errorf("Iteration %d: pause = %v; want in range [0, %v)", n, pause, max) } total += pause } if total < time.Second { t.Errorf("Total time = %v; want > %v", total, time.Second) } }