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How to implement class based unit tests for functions that return random results

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Akshay Jajoo
Akshay Jajoo on 15 Jul 2021
Commented: Akshay Jajoo on 30 Jul 2021
I have to write class based unittests for a function which returns random values. I have ideas on how to do that. For example see the testing methods described in this answer of this stackoverflow question.
I want to know how can we implement this for my function using Matlab's class based (matlab.unittest.TestCase) unit test methods.
Lets call my function which returns the random value as "myRandRetFunc" and it looks like following. How can I implement unit testing for it for things described here or for some other ideas you have in mind.
function rndRetVal = myRandRetFunc(inp1, inp2, inp3)
arg1 = aComplexFunc(inp1, inp2)
arg2 = anotherComplexFunc(inp2, inp3)
rndRetVal = rand(arg1, arg2)

Accepted Answer

Steven Lord
Steven Lord on 16 Jul 2021
The four phases of a four phase test are Setup, Exercise, Verify, and Teardown. In this case, you want to Setup the random number generator to a known fixed state before the code that relies upon it is Exercised. Use the rng function to do this.

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