how to moq a func parameter when unit testing c#

Question

I'm trying to write some tests but I'm not sure how to handle the arguments for setting up my moq mock. Can anyone suggest how I can complete this line of code correctly? Many thanks,

My moq code line

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The parameter is of type shown below for the Returns(...) which I'm not sure how to handle.

Parameter intellisense

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The method is shown below that I'm trying to moq out.

The method definition

public static async Task<CommandResult> SendSupportAsync(this IBus bus, Command command, bool withLogging = true)

UPDATE

I've tried the suggestion, I've added the mocked object and set up the return but the compiler gives the following error:

An expression tree may not contain a call or invocation that uses optional arguments

I did not know MOQ mocked out static methods. I thought you would have to get a testing tool such as TypedMock or the one from Telerik. — TYY, Mar 12 '14 at 12:07

score 0 · Answer 1 · answered Mar 12 '14 at 12:04

0

If you want to mock the return value, then you can create a mock for it

var resultMock = new Mock<Task<CommandResult>>();

then setup your mock object, and you return it like

bus.Setup(x=>c.SendSupportAsync(new TagCommand(ID, MID))).Returns(resultMock.object);

If you do not want to mock the result, then you can create an instance and return it like

bus.Setup(x=>c.SendSupportAsync(new TagCommand(ID, MID))).Returns(objCommandResult);

answered Mar 12 '14 at 12:04

Suresh Kumar Veluswamy

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For your case since you are returning async Task, Moq 4.2 added a ReturnsAsync() extension method. But I have no experience using it. – Suresh Kumar Veluswamy Mar 12 '14 at 12:07
Here is a related thread that discusses on returning async task http://stackoverflow.com/questions/21253523/setup-async-task-callback-in-moq-framework – Suresh Kumar Veluswamy Mar 12 '14 at 12:15
thanks Suresh, I've updated the question, I get a compiler error – James Radford Mar 12 '14 at 12:16

how to moq a func parameter when unit testing c#

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