Class-Based Unit Tests in MATLAB: timeseries function crash against a data type String as constant?

Question

Vladlen Yatsenko 2022-11-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1858603-class-based-unit-tests-in-matlab-timeseries-function-crash-against-a-data-type-string-as-constant

回答： Karan Singh 2023-9-6

queistion.m

Hello Community.

From the first look it seems to be a simple question. But....

Situation: Simulink model. I have Subsystem only with one "Constant"-Block with Data Type "String", for example '011101111' . One output block with the signal name "Signal_output_name". Nothing else.

I am writing simple test case as m-File using class <matlab.unittest.TestCase

The Code is included and attached.

Problem place in code

----------------------------------------------

%% Outputs:

Signal_output_name = ['011101111' '011101111' '011101111' '011101111' '011101111' '011101111' '011101111']';

%% Compare the results

testCase.simIn=testCase.simIn.setExternalInput(inputData); %Set the externatl input values

simOut = sim(testCase.simIn); %get the outputs

testCase.assertEqual(simOut.yout{1}.Values.Data,Signal_output_name); %check the values

------------------------------

If i run the code it doesn´t work, because of:

MATLAB uses in this case the function "timeseries()" and it doesn´t work with data type "String"

Question: How can i make unit test?

Thanks a lot

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Answer 1

Karan Singh 2023-9-6

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在 MATLAB Online 中打开

Hi Vladlen,

From what I understand, you have an issue with MATLAB's “timeseries” function, which does not support string data types. Therefore, the unit test fails when comparing the string array to the output data.

The solution is to convert the string array “Signal_output_name” and the output data to character arrays using the “char” function before performing the comparison. This ensures compatibility and allows for successful unit testing. Here is an updated version of your code with the necessary modifications:

classdef SolverTest < matlab.unittest.TestCase 
    properties 
        simIn 
        mdlStartTime = '0'; 
        mdlStopTime = '0.006'; 
        mdlStepSize = '0.001' 
        loc = '' 
    end 
    
    methods (TestMethodSetup) 
        function addSimulationInput(testCase) 
            testCase.simIn = Simulink.SimulationInput('name_of_the_subsystem'); 
        end 
        
        function setDefaultValuesForModelParams(testCase) 
            % Please adjust the values according to your test suite 
            testCase.mdlStartTime = '0'; 
            testCase.mdlStopTime = '0.006'; 
            testCase.mdlStepSize = '0.001'; 
        end 
        
        function setSimulationParameter(testCase) 
            testCase.simIn = testCase.simIn.setModelParameter('StartTime', testCase.mdlStartTime, 'StopTime', testCase.mdlStopTime); % Set the simulation time 
            testCase.simIn = testCase.simIn.setModelParameter('SolverType', 'FixedStep'); 
            testCase.simIn = testCase.simIn.setModelParameter('FixedStep', testCase.mdlStepSize); 
            testCase.simIn = testCase.simIn.applyToModel; % Apply the changes to the model 
        end 
    end 
    
    methods (Test) 
        function testStringData(testCase) 
            testCase.mdlStopTime = '0.006'; % Increase stoptime to be able to test more cases 
            setSimulationParameter(testCase); % Set stop time to 0.015 
            
            inputData = Simulink.SimulationData.Dataset; 
            inputData.Name = 'testStringData'; 
            
            % Outputs: 
            Signal_output_name = ['011101111'; '011101111'; '011101111'; '011101111'; '011101111'; '011101111'; '011101111']; 
            
            % Compare the results 
            testCase.simIn = testCase.simIn.setExternalInput(inputData); % Set the external input values 
            simOut = sim(testCase.simIn); % Get the outputs 
            
            % Convert string data to character array for comparison 
            expectedData = char(Signal_output_name); 
            actualData = char(simOut.yout{1}.Values.Data); 
            
            testCase.assertEqual(actualData, expectedData); % Check the values 
        end 
    end 
end 

In this updated code, the string data “Signal_output_name” is converted to a character array using the “char” function before comparing it with the simulation output data. Similarly, the simulation output data is also converted to a character array for comparison.

Attached below are some documentation links that you may find helpful: