public async Task AddHttpClient_WhenPollyRetryPolicyIsSet_NoErrorOccurs_NoRetriesAreAttempted()
{
// Arrange
var expectedStausCode = HttpStatusCode.OK;
SetupMockDelegate(expectedStausCode);
IDummyService dummyService = CreateDummyService(_mockDelegatingHandler);
// Act
var response = await dummyService.MakeHttpCallAsync();
// Assert
response.StatusCode.Should().Be(expectedStausCode);
VerifyHttpRequests(Times.Once());
}
public async Task AddHttpClient_WhenPollyRetryPolicyIsSet_SingleServiceErrorsOccur_OperationIsRetried()
{
// Arrange
int retryCount = 0;
var expectedStausCode = HttpStatusCode.OK;
var mockDelegate = Mock.Of <DelegatingHandler>(MockBehavior.Strict);
Mock.Get(mockDelegate)
.Protected()
.Setup <Task <HttpResponseMessage> >(
"SendAsync",
ItExpr.IsAny <HttpRequestMessage>(),
ItExpr.IsAny <CancellationToken>())
.Returns(() =>
{
// First attempt will result in failure
retryCount++;
if (retryCount > 1)
{
return(Task.FromResult(new HttpResponseMessage(expectedStausCode)));
}
else
{
return(Task.FromResult(new HttpResponseMessage(HttpStatusCode.InternalServerError)));
}
});
IDummyService dummyService = CreateDummyService(mockDelegate);
// Act
Func <Task <HttpResponseMessage> > act = async() => await dummyService.MakeHttpCallAsync();
// By default, first call to Act is not sufficent to trigger circuit breaker
var response = await act();
// Assert
response.StatusCode.Should().Be(expectedStausCode);
Mock.Get(mockDelegate)
.Protected()
.Verify(
"SendAsync",
Times.Exactly(2),
ItExpr.IsAny <HttpRequestMessage>(),
ItExpr.IsAny <CancellationToken>());
}
public async Task AddHttpClient_When_PollyRetryPolicyIsSet_And_MultipleConsecutiveSericeErrorsOccur_Then_CircuitBreakerIsTriggered()
{
// Arrange
var expectedStausCode = HttpStatusCode.InternalServerError;
SetupMockDelegate(expectedStausCode);
IDummyService dummyService = CreateDummyService(_mockDelegatingHandler);
// Act
Func <Task <HttpResponseMessage> > act = async() => await dummyService.MakeHttpCallAsync();
// By default, first call to Act is not sufficent to trigger circuit breaker
var response = await act();
// Assert
response.StatusCode.Should().Be(expectedStausCode);
// Second call has caused sufficent number of failures to trigger
act.Should().Throw <BrokenCircuitException <HttpResponseMessage> >();
VerifyHttpRequests(Times.Exactly(5));
}
