Mock multiple calls with same params
This is an example on how to mock a call when it’s called multiple times, and with the same parameter type every time.
Setup
I have the following class…
public class ConnectorRequest
{
public string Query { get; set; }
}
… which will be consumed by the following service
public class IConnectorService
{
Task<string> Execute(ConnectorRequest request);
}
Then I have a class which calls IConnectorService multiple times
public class ConnectorConsumerService
{
private IConnectorService _service;
// ...
public async Task<string> Process()
{
// ... does whatever
var response1 = await _service.Execute(request1);
// ... does whatever with that information
var response2 = await _service.Execute(request2);
// ... does whatever with that information
var response3 = await _service.Execute(request3);
// ... does whatever with that information
// ... does whatever else
}
// ...
}
Test
Test which mocks multiple calls
public class ConnectorConsumerServiceTest
{
// all mocks and stubs
private Mock<IConnectorService> _dependencyMock;
// service under test
private ConnectorConsumerService _service;
public ConnectorConsumerServiceTest()
{
_dependencyMock = new Mock<IConnectorService>();
_service = new ConnectorConsumerService(_dependencyMock.Object);
}
[Fact]
public async Task ProcessXXX_CaseXXX_ShouldReturnOkay()
{
// ARRANGE
// example starts here! ->
var responseToExecution1 = new ConnectorRequest
{
Query = "some response";
}
var responseToExecution2 = new ConnectorRequest
{
Query = "another response";
}
var responseToExecution3 = new ConnectorRequest
{
Query = "oh no! a response";
}
_dependencyMock.SetupSequence(mock => mock.Execute(It.IsAny<ConnectorRequest>()))
.ReturnsAsync(responseToExecution1)
.ReturnsAsync(responseToExecution2)
.ReturnsAsync(responseToExecution3);
// <- example ends here
// ACT
var result = await _service.Process();
// ASSERT
result.status.Should().NotBeNull();
// ... assert whatever
}
}