Mocking File/OutputStream help

[Lyane Foly]

Hi there,
I am testing a function that create a fileOutputStream in the body of the function.
This the simple example I wrote just to show my problem.

Here is my class:

Class A {
 ClassB classB;

public void getFileName(Object value){

/* many things hapening here */
String name = extractnameFromValue(value)
FileOutputStream stream = new FileOutputStream(name);		
classB.saveFile(stream);
}
}

Using EasyMock I test this way

ClassATestCase{

@TestedObject
ClassA classA;

@Mock
ClassB classB;

@Test
public void testGetName(){

/* I get the same name here */
String name = extractnameFromValue(value)

/* but I get different stream object here */
FileOutputStream stream = new FileOutputStream(name);


/*This fails because the ojects are different, any way I can mock this? */
classB.saveFile(stream)


EasyMockUnitUtils.replay();

classA.getFile(name)
}

}

I am getting an assertionError because 2 differents FileOutputStream are getting created. This make sense to me, but I am not sure how to sole this issue.
Any help would be appreciated. Aslo I cannot pass the fileoutputstream to the getFileName() function because that interface is already defined and I can changed it...

Error is here:

java.lang.AssertionError: 
  Unexpected method call saveFile(java.io.FileOutputStream@1d63e39):
    saveFile(java.io.FileOutputStream@192b996): expected: 1, actual: 0
	at org.easymock.internal.MockInvocationHandler.invoke(MockInvocationHandler.java:29)
	at org.easymock.internal.ObjectMethodsFilter.invoke(ObjectMethodsFilter.java:56)
	at org.easymock.classextension.internal.ClassProxyFactory$1.intercept(ClassProxyFactory.java:74)

Thanks

[Jeanne Boyarsky]

Lyane,
Welcome to CodeRanch!

Have you looked into argument matchers? They let you redefine equality in any way you want.