Capturing arguments from private method (Mockito & PowerMock)

[Eyal Ringort]

Hi All,

Using Mockito with PowerMock

I have the following scenario (a more complex one but this is a simplified one):

class A {
  public int funcA(int i) {
    funcB("some manipulation of i")

  }

  private int funcB(int i) {

  }
}

I am running funcA and I know how to mock private function funcB, but I want to capture the parameter that is passed to funcB - Is it possible? I tried using Mockito's captor bit I get an error (Argument(s) are different).

Thanks,

Eyal

[Johan Haleby]

Hi, 

Perhaps you can have a look at this example in git (captorAnnotationWorksOnPrivateMethods). The class that is tested is located here. 

/Johan

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[Eyal Ringort]

Hi,

This is what I did exactly but the capture didn't work...Are you sure this works?

[Johan Haleby]

Well it works for me at least. I'm using JUnit thought, haven't tried it in TestNG.

[Johan Haleby]

-thought + though

[Eyal Ringort]

Hi Johan,

In my case, the private method name is equal to the public one but with different arguments - Can this be the cause of my problem?

[Johan Haleby]

Yeah it could. I've updated the test with an example that uses private overloaded methods and captor. The verification step looks like this:

verifyPrivate(demo).invoke(method(PrivateFinalOverload.class, "say", String.class, String.class)).withArguments(anyString(), captor.capture());

However when running this example ran into a bug in PowerMock (had to do with argument concatenation). I've now fixed this and uploaded a new SNAPSHOT to sonatype. So please try it out by depending on version 1.5.7-SNAPSHOT after having added the following repo:

<repositories>

        <repository>

            <id>sonatype</id>

            <url>https://oss.sonatype.org/content/repositories/snapshots/</url>

            <snapshots />

        </repository>

</repositories>

Tell me if it works for you or not.

/Johan

[Eyal Ringort]

HI Johan,

What if I want to mock the private method?

[Johan Haleby]

Look at the example. It's partially mocking a private final overloaded method.

/Johan