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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 spanner
-
- import (
- "math"
- "time"
-
- "testing"
- )
-
- // Test if exponential backoff helper can produce correct series of
- // retry delays.
- func TestBackoff(t *testing.T) {
- b := exponentialBackoff{minBackoff, maxBackoff}
- tests := []struct {
- retries int
- min time.Duration
- max time.Duration
- }{
- {
- retries: 0,
- min: minBackoff,
- max: minBackoff,
- },
- {
- retries: 1,
- min: minBackoff,
- max: time.Duration(rate * float64(minBackoff)),
- },
- {
- retries: 3,
- min: time.Duration(math.Pow(rate, 3) * (1 - jitter) * float64(minBackoff)),
- max: time.Duration(math.Pow(rate, 3) * float64(minBackoff)),
- },
- {
- retries: 1000,
- min: time.Duration((1 - jitter) * float64(maxBackoff)),
- max: maxBackoff,
- },
- }
- for _, test := range tests {
- got := b.delay(test.retries)
- if float64(got) < float64(test.min) || float64(got) > float64(test.max) {
- t.Errorf("delay(%v) = %v, want in range [%v, %v]", test.retries, got, test.min, test.max)
- }
- }
- }
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