Check the equality of custom Classes using Matlab Unit Test suite

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Jeno Boka 2017-4-26

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https://ww2.mathworks.cn/matlabcentral/answers/337420-check-the-equality-of-custom-classes-using-matlab-unit-test-suite

回答： Stephen Carter 2017-4-28

I am currently developing a class based Matlab Unit Test project, I am using the following code to verify the equality of two structures

verifyThat(testCase,struct1,IsEqualTo(struct2,'Within', RelativeTolerance(2*eps)))

But unfortunately I get an error message

    IsEqualTo failed.
    --> Path to failure: <Value>.req_results
        --> ObjectComparator failed.
            --> The objects are not equal using "isequal".
            --> The tolerance was ignored. The tolerance as specified does not support comparisons of Result values.

How to implement a method for testing the equality of two structures, consisting of elements belonging to different classes? Even when some of of them are custom classes.

I want a method compatible with verifyThat

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Stephen Carter 2017-4-26

编辑：Stephen Carter 2017-4-26

在 MATLAB Online 中打开

I see that ObjectComparator is the one that is failing here.

You might be able to leverage the PublicPropertyComparator.supportingAllValues() static method here and use in place of object comparator.

Here is a workaround:

import matlab.unittest.constraints.IsEqualTo;
import matlab.unittest.constraints.PublicPropertyComparator;
% get access to the comparators that IsEqualTo uses by default:
tmp=IsEqualTo([]);
comparators = tmp.Comparator;
% add PublicPropertyComparator to the front (to be picked up before ObjectComparator does)
comparators = [PublicPropertyComparator.supportingAllValues(), comparators];
% perform qualification
verifyThat(testCase,struct1,IsEqualTo(struct2,...
  'Using',comparators,'Within', RelativeTolerance(2*eps)))

Note that PublicPropertyComparator will behave much differently than ObjectComparator in that it only supports MATLAB objects and only inspects the public properties.

Let me know if that helps.

Jeno Boka 2017-4-28