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
	}
}