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- // 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)
- }
- }
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