| // Copyright 2017 Google LLC |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| 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) |
| } |
| } |