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again_test.go
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package again_test
import (
"context"
"errors"
"testing"
"time"
"github.com/stretchr/testify/require"
"github.com/jdvr/go-again"
)
func TestWithExponentialBackoff(t *testing.T) {
t.Run("given operation is called until timeout", func(t *testing.T) {
givenOperation := NewFakeOperation(t)
givenOperation.allowAnyCall = true
retryer := again.WithExponentialBackoff[int](again.BackoffConfiguration{
InitialInterval: 10 * time.Millisecond,
MaxInterval: 50 * time.Millisecond,
IntervalMultiplier: 2,
Timeout: 20 * time.Millisecond,
})
_, err := retryer.Retry(context.Background(), givenOperation)
require.Error(t, err)
givenOperation.haveBeenCalled(3)
})
t.Run("disable random delays", func(t *testing.T) {
givenOperation := NewFakeOperation(t)
givenOperation.allowAnyCall = true
retryer := again.WithExponentialBackoff[int](again.BackoffConfiguration{
InitialInterval: 10 * time.Millisecond,
MaxInterval: 50 * time.Millisecond,
IntervalMultiplier: 2,
Timeout: 20 * time.Millisecond,
DisableRandomization: true,
})
_, err := retryer.Retry(context.Background(), givenOperation)
require.Error(t, err)
givenOperation.haveBeenCalled(3)
})
}
func TestWithConstantDelay(t *testing.T) {
t.Run("given operation is called until timeout", func(t *testing.T) {
givenOperation := NewFakeOperation(t)
givenOperation.allowAnyCall = true
retryer := again.WithConstantDelay[int](1*time.Millisecond, 3*time.Millisecond)
_, err := retryer.Retry(context.Background(), givenOperation)
require.Error(t, err)
givenOperation.haveBeenCalled(4)
})
}
func TestRetryOperation(t *testing.T) {
t.Run("given operation is called until permanent error", func(t *testing.T) {
testContext := context.Background()
givenOperation := NewFakeOperation(t)
givenOperation.
givenContext(testContext).
Returns(0, errors.New("no permanent"))
givenOperation.
givenContext(testContext).
Returns(0, errors.New("no permanent"))
expectedErr := errors.New("whatever")
givenOperation.
givenContext(testContext).
Returns(0, again.NewPermanentError(expectedErr))
_, err := again.RetryOperation[int](testContext, givenOperation)
require.ErrorIs(t, err, expectedErr)
givenOperation.haveBeenCalled(3)
})
}
func TestRetry(t *testing.T) {
t.Run("given function is called until permanent error", func(t *testing.T) {
testContext := context.Background()
expectedErr := errors.New("whatever")
called := 0
givenFunc := func(ctx context.Context) (bool, error) {
called++
if called > 3 {
return false, again.NewPermanentError(expectedErr)
}
return false, errors.New("whatever")
}
_, err := again.Retry[bool](testContext, givenFunc)
require.ErrorIs(t, err, expectedErr)
require.Equal(t, 4, called)
})
}