public void PriceBreakdownById() { var httpClient = new HttpClient(_handlerMock.Object); var subjectUnderTest = new WidgetRepository(_options, httpClient); var result = subjectUnderTest.PriceBreakdownById(12, null); result.Should().NotBeNull(); // this is fluent assertions here... // also check the 'http' call was like we expected it var expectedUri = new Uri("https://serverTest.com/recipes/12/priceBreakdownWidget?123"); _handlerMock.Protected().Verify( "SendAsync", Times.Exactly(2), // we expected a single external request ItExpr.Is <HttpRequestMessage>(req => req.Method == HttpMethod.Get && // we expected a GET request req.RequestUri == expectedUri // to this uri ), ItExpr.IsAny <CancellationToken>() ); }