Create a mock with defined behavior on different subsequent method calls

Question

Markus Leuthold 2019-8-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/475852-create-a-mock-with-defined-behavior-on-different-subsequent-method-calls

回答： David Hruska 2019-12-27

Assume a mocked class

testCase = matlab.mock.TestCase.forInteractiveUse;
[mock, behavior] = createMock(testCase, "AddedMethods", ["methodA" "methodB"]);

How do I define the following behavior?

assert(mock.methodA == 1)
assert(mock.methodB == 2)
assert(mock.methodA == 3)

How do I assign output values for different methods of the mock in a predefined order? I only find examples of defining the behavior of subsequent calls of the SAME method, but no example for defining subsequent calls including different methods of a mocked class. Something like

testCase.assignOutputsWhen(withExactInputs(behavior.methodA), 1);
testCase.assignOutputsWhen(withExactInputs(behavior.methodB), 2);
testCase.assignOutputsWhen(withExactInputs(behavior.methodA), 3);

does not work, unfortunately. Using when()/then() which allows to define subsequent actions does not work either, since the condition is used on one single method, not on several methods of a class. Are there any other possibilities?

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Answer 1

David Hruska 2019-12-27

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I know this reply is coming very late, but if it's still helpful, this is possible in R2019b using the Invoke action to define more custom mock object behaviors:

function example
    import matlab.mock.actions.Invoke;
    
    % Nested function to keep track of state between method calls
    count = 0;
        function out = counter(varargin)
            count = count + 1;
            out = count;
        end
    
    testCase = matlab.mock.TestCase.forInteractiveUse;
    [mock, behavior] = createMock(testCase, "AddedMethods", ["methodA" "methodB"]);
    
    % Both method calls invoke the counter function above:
    when(withExactInputs(behavior.methodA), Invoke(@counter));
    when(withExactInputs(behavior.methodB), Invoke(@counter));
    
    assert(mock.methodA == 1)
    assert(mock.methodB == 2)
    assert(mock.methodA == 3)
end