How to return two different values depending on the argument values in Moq method setup?

user_6149099 0
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I have a test where at some point two lists are compared.

IsEqual(List<string> a, List<string> b, ComparisonConfig conf)

The above function returns true result if List A equals List B and false result otherwise.

In tests I need to setup this function so it returns correct outcome when its called.

_service
    .Setup(x => x.IsEqual(It.IsAny<List<string>>(), It.IsAny<List<string>>(), null))
    .Returns(Result.Ok(true));

for now this always returns true even though lists are not equal.

So the question is how can I make this setup return Result.Ok(true) when arguments are equal and Result.Ok(false) otherwise.

moq unit-testing c#
1 Answers

Returns has several overloads accepting Func's with different number of parameters so it is possible to access invocation arguments when returning a value:

_service.Setup(x => x.IsEqual(It.IsAny<List<string>>(), It.IsAny<List<string>>(), null))
    .Returns((List<string> l1, List<string> l2, ComparisonConfig c) => 
    {
        if(...) // some logic with l1 and l2
        {
            return Result.Ok(true);
        }
        return Result.Ok(false);
    });

The delegate used by Returns should match the signature and return type of the member being setup.

user_25012790
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