100 lines
1.9 KiB
Go
100 lines
1.9 KiB
Go
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package backoff
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import (
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"errors"
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"fmt"
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"log"
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"testing"
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"time"
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"golang.org/x/net/context"
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)
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func TestRetry(t *testing.T) {
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const successOn = 3
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var i = 0
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// This function is successful on "successOn" calls.
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f := func() error {
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i++
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log.Printf("function is called %d. time\n", i)
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if i == successOn {
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log.Println("OK")
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return nil
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}
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log.Println("error")
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return errors.New("error")
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}
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err := Retry(f, NewExponentialBackOff())
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if err != nil {
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t.Errorf("unexpected error: %s", err.Error())
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}
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if i != successOn {
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t.Errorf("invalid number of retries: %d", i)
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}
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}
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func TestRetryContext(t *testing.T) {
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var cancelOn = 3
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var i = 0
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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// This function cancels context on "cancelOn" calls.
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f := func() error {
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i++
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log.Printf("function is called %d. time\n", i)
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// cancelling the context in the operation function is not a typical
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// use-case, however it allows to get predictable test results.
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if i == cancelOn {
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cancel()
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}
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log.Println("error")
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return fmt.Errorf("error (%d)", i)
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}
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err := Retry(f, WithContext(NewConstantBackOff(time.Millisecond), ctx))
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if err == nil {
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t.Errorf("error is unexpectedly nil")
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}
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if err.Error() != "error (3)" {
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t.Errorf("unexpected error: %s", err.Error())
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}
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if i != cancelOn {
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t.Errorf("invalid number of retries: %d", i)
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}
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}
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func TestRetryPermenent(t *testing.T) {
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const permanentOn = 3
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var i = 0
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// This function fails permanently after permanentOn tries
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f := func() error {
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i++
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log.Printf("function is called %d. time\n", i)
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if i == permanentOn {
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log.Println("permanent error")
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return Permanent(errors.New("permanent error"))
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}
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log.Println("error")
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return errors.New("error")
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}
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err := Retry(f, NewExponentialBackOff())
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if err == nil || err.Error() != "permanent error" {
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t.Errorf("unexpected error: %s", err)
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}
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if i != permanentOn {
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t.Errorf("invalid number of retries: %d", i)
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}
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}
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