mocking void methods with arguments

[Joe Kearney]

Hi,

I need to mock a static void method that takes arguments. Is this possible, and how do I specify matchers for the arguments? Noddy sample below, I hope this conveys the idea.

Thanks,
Joe

============================================

class Static {
    public static void methodToMock(ParameterClass p) { ... }
}

class TestClass {
    public void testMethod() {
        mockStatic(Static.class);
        PowerMockito.doReturn(someObject).when(Static.class);
        Static.methodToMock(<accepts ParameterClass, not Matcher<ParameterClass>);

        // ... rest of the test and assertions
    }
}

[Joe Kearney]

Ok, so I was using hamcrest matchers, not Mockito matchers, my mistake. Sorry for the spam.

Thanks,
Joe

2009/11/13 Joe Kearney <Joe.K...@morganstanley.com>

[Johan Haleby]

Hi,

Yes you can mock void methods. There's an example in the documentation (under "How to stub void static method to throw exception"). You can also have a look at e.g. "testMockStaticVoidWhenThrowingException" in MockStaticTest in subversion. These tells how to mock a static void method to throw an exception. If you just want to stub the method to do nothing you can either do something like:

suppress(method(Static.class, "methodName"));

or use the PowerMock equivalent of Mockito's doNothing() or doAnswer() etc.

Good luck,
/Johan

[yamini majety]

Hi,

 

I am new to Power Mock. Can any one help me on mocking a void static method using doAnswer(). My requirement is when a static void method is called i should be able to capture the arguments and return a value.

 

I tried to do the following but is giving me an error,

 

PowerMockito.mockStatic(StaticClass.class);

 

doAnswer(new Answer(){

 public Object answer(InvocationOnMock inv){

   Object[] args = InvocationOnMock.getArguments;

   //Do something

  return string

 }

}).when(StaticClass.class)staticVoidMethod();

 

I am not able to pass StaticClass.class but is expecting a mock object. And PowerMockito.mockStatic wont return any mock object.

 

Please help.

[Johan Haleby]

You can do like this if method is private:

 doAnswer(new Answer<String>() {

            public String answer(InvocationOnMock invocation) throws Throwable {

                return "Hello static";

            }

        }).when(StaticExample.class, "privateObjectMethod");

or like this if it's public:

   doAnswer(new Answer<String>() {

            public String answer(InvocationOnMock invocation) throws Throwable {

                return "something";

            }

        }).when(StaticExample.class);

        StaticExample.staticMethodReturningString();

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