Check the equality of custom Classes using Matlab Unit Test suite
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Jeno Boka
on 26 Apr 2017
Answered: Stephen Carter
on 28 Apr 2017
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
2 Comments
Stephen Carter
on 26 Apr 2017
Edited: Stephen Carter
on 26 Apr 2017
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.
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