ArgumentMatching.md

Argument Matching

Both for setting up and for verification, argument matchers are used to see if the method call is applicable.

MockClass mockClass;
When(mockClass.Add).With(_, 2).Return(123);

assert(mockClass.Add(1, 2) == 123);

Here, _ will match any argument and the 2 uses operator== to check for value equality. Alternatively, a predicate can be provided to check if the argument matches a condition:

When(mockClass.Add).With(_, [](int b) { return b > 2; }).Return(10);
When(mockClass.Add).With(_, std::bind(std::less<int>(), _1, 3)).Return(20);

assert(mockClass.Add(1, 2) == 20);
assert(mockClass.Add(1, 3) == 10);