How to change property behavior for a mocked object

TADA asked: 2023-04-20 mocking framework , mock , test , Software Development Tools

Learn how to customize property behavior in mocked objects using MATLAB. Discover techniques to simulate real-world scenarios & enhance your testing. Start impr

Expert Answer

John Michell answered . 2025-07-30 22:22:15

Mock objects are still a recent feature of MATLAB and I don't think they are practical for testing classes yet. There are still quite a few features that are lacking for sufficiantly replicating object behaviour, for instance having a mock object method call assign a value to a protected property.

The solution to the above case is to create your mock without using the meta-class instance:

testCase = matlab.mock.TestCase.forInteractiveUse;
[MyClassMock, behaviour] = createMock(testCase, 'AddedProperties', "prop1", 'AddedMethods', "answer")

testCase.assignOutputsWhen(get(behaviour.prop1), 'abc')
p = MyClassMock.prop1

It's not ideal but I don't think there's any other option at this time. You can still test for access violations this way:

import matlab.mock.actions.ThrowException
when(set(behaviour.prop1),...
    ThrowException(MException('MATLAB:class:SetProhibited',...
    'You cannot set the read-only property ''prop1'' of MyClass.')))

Creating a mock from a meta-class only works for classes with abstract properties and methods.

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