CODEWITHSUNDEEP
javajunitpowermockeasymock
Naveen Yadav
Naveen Yadav

Reputation: 233

How to test static void functions using Powermock easyMock?

I have a static function that returns void.

This function performs some operation and populates a map internally.

Something like this...

public static void doSomething(arg1,arg2,arg3) {
    //Do some processing with the input parameters

    if(arg1 satisfies given condition) {
        //Create object
        Conn conn = new Conn()

        Map<String, List<String>> map = new Map();

        //Populate the map with the processed value

        conn.setAttributes(map);
    }
}

Now I want to test if the condition is satisfied whether my 'map' in 'conn' object is populated with the expected values or not? Need help on this.

Upvotes: 0

Views: 101

Answers (1)

Timothy Truckle
Timothy Truckle

Reputation: 15622

The problem here is the hidden dependency, the instantiation of the Conn object.

As a rule of thumb business code should not be responsible for aquiering dependencies it has to comunicate with.

You have two solutions:

  1. Surrender to your bad design and use Powermock to inject a Mock of Conn.

  2. Improve your design and use dependency injection/inversion of control.

    This can be done by simply replace the inner instantiation of the Conn object with an additional Parameter of type Conn.

    But even better would be to turn your static method into a regular non-static member method and pass the instance of Conn as Constructor parameter to be held in a private final member variable.

    Given that class Conn is not final you can use regual mocking frmeworks to create mocks of Conn and use that in your UnitTests.

Upvotes: 1

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