[MO-java-users] RE: [MO-java-dev] creating a dynamic mock error - com.packagename.classname is not an interface.

[veny <ve...@p2...>]

Hi Francois,

Thanks for your explanation.

I have another question thought. How should i write the equivalent of
methods 'dynamic.Mock.expect(String methodName)' and
'dynamic.Mock.expectAndReturn(String methodName, java.lang.Object obj)' in
own Mock object?

Is there any sample available?

Thanks lots.

Veny

-----Original Message-----
From: Francois Beausoleil [mailto:fb...@us...]
Sent: Tuesday, September 16, 2003 11:43 AM
To: ve...@p2...
Subject: Re: [MO-java-dev] creating a dynamic mock error -
com.packagename.classname is not an interface.


As you have noticed, you cannot mock classes.  For your information,
java.util.List is an interface, not a class.  ArrayList and LinkedList
are actual implementations of the List interface.

To mock concrete classes, you have to resort to the old way:
public class ObjectUnderTest {
    public void method(Object arg) {
         // Do something
    }
}

public class MockObjectUnderTest extends ObjectUnderTest implements
Verifiable {
    private ExpectationValue expectedArg = new ExpectationValue("arg");

    public void setExpectedArg(Object arg) {
        expectedArg.setExpected(arg);
    }

    public void method(Object arg) {
        expectedArg.setActual(arg);
        // Might call into super class to execute the code for real, or
        not,
        // depending on your needs.
    }

    public void verify() {
        // This asserts that all Verifiable objects in this class have
        their
        // verify() methods called, and any exceptions thrown up the
        // call stack
        Verifier.verifyObject(this);
    }
}

That is why most programmers and designers recommend coding against
interfaces.  This helps because you can then send in a mock
implementation.  DynaMocks are simpler to setup than old-style Mocks.

I sure hope that helps !

If you have other questions, do not hesitate !

François


On Tue, 16 Sep 2003 10:06:14 +0800, "veny" <ve...@p2...> said:
> Hi all,
>
> I've been using DynaMock to create mock class from interfaces. It works
> great. However, when i tried to mock my classes, there's always this
> error:
> "com.packagename.classname is not an interface". I've tried to mock java
> class (e.g. java.util.List), it works. But why creating of mock of my
> custom
> class doesn't? Any idea?
>
> Thanks.
>
> Veny
Developer of Java Gui Builder
http://jgb.sourceforge.net/