Testclass: How to store a method input within a mocked class property?

I want to mock an physical instrument with a motorized wheel within my testclass. My goal is to mock the two main functionalities:

• moveToPosition(obj, targetAngle) triggers the controller to move the wheel to the desired position
• currentAngle = getCurrentPosition(obj) read out the encoder to get the current wheel position

As no hardware is attached, the mocked moveToPosition method shall only store the target angle as property such that the getCurrentPosition method can return this value toghether with a small offset.

I wrote the following example. It failes because matlab.mock.TestCase seems to be a value class and not a handle class. Therefore the property currentAngle is not assigned permanently within setValue:

classdef TestMotorization < matlab.mock.TestCase

properties

myMotor

end

methods (TestClassSetup)

function creatMocks(testCase)

import matlab.mock.actions.Invoke

import matlab.mock.actions.StoreValue

import matlab.mock.actions.AssignOutputs;

[motorMock, motorBehaviour] = createMock(testCase,...

'AddedMethods',{'moveToPosition','getCurrentPosition'},'AddedProperties',{'currentAngle'});

% Setup behaviour

when(set(motorBehaviour.currentAngle),StoreValue)

when(withAnyInputs(motorBehaviour.moveToPosition),Invoke(@setValue))

when(withAnyInputs(motorBehaviour.getCurrentPosition),AssignOutputs(motorMock.currentAngle))

% Keep as TestCase property

testCase.myMotor = motorMock;

function setValue(obj, newAngle)

positioningOffset = 0.01;

obj.currentAngle = newAngle + positioningOffset;

end

end

end

methods (Test)

function testMoveMotorizationSuccess(testCase)

testCase.myMotor.moveToPosition(2.1);

currentPosition = testCase.myMotor.getCurrentPosition();

testCase.verifyEqual(currentPosition, 2.11);

end

end

end

Is there a way to store a method input within a mock class property and read it out later with another method?

Answer 1

[Christian Niklaus]

Thanks to the suport team, I was able to solve the problem.

The createMock object must be created as handle-class object by using ?handle as second input argument. The get value definition should be created as well with the Invoke method.

The working solution looks like this:

classdef TestMotorization < matlab.mock.TestCase
    properties
        myMotor
    end
    methods (TestClassSetup)
        function creatMocks(testCase)
            import matlab.mock.actions.Invoke
            import matlab.mock.actions.StoreValue
            import matlab.mock.actions.AssignOutputs;
            [motorMock, motorBehaviour] = createMock(testCase, ?handle, ...
                'AddedMethods',{'moveToPosition','getCurrentPosition'},'AddedProperties',{'currentAngle'});
            % Setup behaviour
            when(set(motorBehaviour.currentAngle),StoreValue)
            when(withAnyInputs(motorBehaviour.moveToPosition),Invoke(@setValue))
            when(withAnyInputs(motorBehaviour.getCurrentPosition),Invoke(@getValue))
            % Keep as TestCase property
            testCase.myMotor = motorMock;
            function setValue(obj, newAngle)
                positioningOffset = 0.01;
                obj.currentAngle = newAngle + positioningOffset;
            end
            function angle = getValue(obj)
                angle = obj.currentAngle;
            end
        end
    end
    methods (Test)
        function testMoveMotorizationSuccess(testCase)
            testCase.myMotor.moveToPosition(2.1);
            currentPosition = testCase.myMotor.getCurrentPosition();
            testCase.verifyEqual(currentPosition, 2.11);
        end
    end
end