public async Task ShouldNotRetryOnSuccess()
{
var retryLogic = new AsyncRetryLogic(TimeSpan.FromSeconds(5), null);
var work = CreateFailingWork(5);
var result = await retryLogic.RetryAsync(() => work.Work(null));
result.Should().Be(5);
work.Invocations.Should().Be(1);
}
public async Task ShouldRetryOnTransientErrors(Exception error)
{
var retryLogic = new AsyncRetryLogic(TimeSpan.FromSeconds(5), null);
var work = CreateFailingWork(5, error);
var result = await retryLogic.RetryAsync(() => work.Work(null));
result.Should().Be(5);
work.Invocations.Should().Be(2);
}
public async Task ShouldNotRetryOnNonTransientErrors(Exception error)
{
var retryLogic = new AsyncRetryLogic(TimeSpan.FromSeconds(5), null);
var work = CreateFailingWork(0, error);
var exc = await Record.ExceptionAsync(() => retryLogic.RetryAsync(() => work.Work(null)));
exc.Should().Be(error);
work.Invocations.Should().Be(1);
}
public async Task ShouldRetryAtLeastTwice()
{
var error = new TransientException("code", "message");
var logger = new Mock <ILogger>();
var retryLogic = new AsyncRetryLogic(TimeSpan.FromSeconds(1), logger.Object);
var work = CreateFailingWork(TimeSpan.FromSeconds(2), 1, error);
var result = await retryLogic.RetryAsync(() => work.Work(null));
result.Should().Be(1);
logger.Verify(x => x.Warn(error,
It.Is <string>(s => s.StartsWith("Transaction failed and will be retried in"))),
Times.Once);
}
public async Task ShouldLogRetries(int errorCount)
{
var error = new TransientException("code", "message");
var logger = new Mock <ILogger>();
var retryLogic = new AsyncRetryLogic(TimeSpan.FromMinutes(1), logger.Object);
var work = CreateFailingWork(1,
Enumerable.Range(1, errorCount).Select(x => error).Cast <Exception>().ToArray());
var result = await retryLogic.RetryAsync(() => work.Work(null));
result.Should().Be(1);
logger.Verify(x => x.Warn(error,
It.Is <string>(s => s.StartsWith("Transaction failed and will be retried in"))),
Times.Exactly(errorCount));
}
public async Task ShouldThrowServiceUnavailableWhenRetriesTimedOut()
{
var errorCount = 3;
var exceptions = Enumerable.Range(1, errorCount).Select(i => new TransientException($"{i}", $"{i}"))
.Cast <Exception>().ToArray();
var logger = new Mock <ILogger>();
var retryLogic = new AsyncRetryLogic(TimeSpan.FromSeconds(2), logger.Object);
var work = CreateFailingWork(TimeSpan.FromSeconds(1), 1, exceptions);
var exc = await Record.ExceptionAsync(() => retryLogic.RetryAsync(() => work.Work(null)));
exc.Should().BeOfType <ServiceUnavailableException>()
.Which.InnerException.Should().BeOfType <AggregateException>()
.Which.InnerExceptions.Should().BeSubsetOf(exceptions);
}