How to verify number of call of private method in public method in Junit?

Question

public void publicMethod() {
  for (i=1;i<10;i++)
    privateMethod();
}

private privateMethod() {
    something...
}

I need to write a JUnit testcase to verify the number of times the privateMethod() is called.

GhostCat · Accepted Answer · 2016-09-08 18:14:03Z

11

You shouldn't do that. You don't write unit tests to verify implementation details.

Your tests make sure that your public methods fulfill their contract. So you assert that things returned are as expected; or that subsequent calls to other methods give the desired output. Or you expect calls to throw specified exceptions. Or, third option: you injected mocked objects; which you later on verify that the mocks saw the method calls you specified upfront.

But writing test cases to specifically test private methods is really bad practice!

answered Sep 8, 2016 at 18:14

GhostCat

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5 Comments

Kesem David Over a year ago

should be the accepted answer. private methods are not what your class provides to the users of it, it the way it implements what it provides.

Kesem David Over a year ago

oh what a shame :)

Kesem David Over a year ago

Hope you'll get it, hopefully one day ill grow up and be as good as you are

GhostCat Over a year ago

Sure. Just keep going. And I see: I already helped you today with some upvotes; like stackoverflow.com/questions/39392907/… ...

Kesem David Over a year ago

Oh that was you ♥

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