CODEWITHSUNDEEP
javaunit-testingjunitmockingeasymock
randomUser56789
randomUser56789

Reputation: 936

How to initialize mocked object?

Lets say I have the following code:
Mocked object class

public class SomeClass {
    private Foo someField;
    public SomeClass {
        someField = new Foo();
    }
    public Foo getSomeField { return someField; }
    public void getSomething() {}
    public boolean doSomething(Object object) {}
}

Next I have test suite

public class TestSuite {
    private ClassToTest classToTest;
    private SomeClass mock;

    @Before
    public void setUp() {
        classToTest = new ClassToTest();
        mock = EasyMock.createMock(SomeClass.class);
    }

    @Test
    public void testMethod() throws Exception { 
        mock.getSomething();
        EasyMock.replay(mock);

        classToTest.methodToTest(mock); //Where methodToTest accepts SomeClass and int

        EasyMock.verify(mock);
    }
}

And method which is being tested

public void methodToTest(SomeClass a) {
    //Logic here
    Foo b = a.getSomeField();
    b.do(); // <--- null pointer exception here because someField isn't initialized
    a.getSomething(); // <--- thing I want to test if it is being called, but can't due to exception prior to this line
    //Logic after
}

I am stuck.. So yea basically SomeClass isn't initialized like I wanted to. Is there any workaround? Or maybe any other frameworks which can do something like that?

Upvotes: 2

Views: 2739

Answers (1)

Jon Skeet
Jon Skeet

Reputation: 1499790

Your methodToTest calls a.getSomeField(), but the setup part of your test doesn't expect that call. You want something like:

Foo foo = new Foo();
EasyMock.expect(mock.getSomeField()).andReturn(foo);

Or to stub the call:

Foo foo = new Foo();
EasyMock.expect(mock.getSomeField()).andStubReturn(foo);

(before your call to mock.getSomething()).

See this question for the differences between andReturn and andStubReturn.

Upvotes: 2

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