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63 lines
1.6 KiB
Go
63 lines
1.6 KiB
Go
/*
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Copyright 2017 Google Inc. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package spanner
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import (
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"math"
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"time"
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"testing"
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)
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// Test if exponential backoff helper can produce correct series of
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// retry delays.
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func TestBackoff(t *testing.T) {
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b := exponentialBackoff{minBackoff, maxBackoff}
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tests := []struct {
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retries int
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min time.Duration
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max time.Duration
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}{
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{
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retries: 0,
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min: minBackoff,
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max: minBackoff,
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},
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{
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retries: 1,
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min: minBackoff,
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max: time.Duration(rate * float64(minBackoff)),
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},
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{
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retries: 3,
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min: time.Duration(math.Pow(rate, 3) * (1 - jitter) * float64(minBackoff)),
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max: time.Duration(math.Pow(rate, 3) * float64(minBackoff)),
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},
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{
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retries: 1000,
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min: time.Duration((1 - jitter) * float64(maxBackoff)),
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max: maxBackoff,
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},
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}
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for _, test := range tests {
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got := b.delay(test.retries)
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if float64(got) < float64(test.min) || float64(got) > float64(test.max) {
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t.Errorf("delay(%v) = %v, want in range [%v, %v]", test.retries, got, test.min, test.max)
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}
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}
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}
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