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I need to mock a private void method which takes no arguments using mockito and powermock.
The method belongs to a instance which is a spy.
I am aware the fact I need to do this suggests bad code but I am working with an old project converting the unit tests from one testing framework to another.
If anyone has any suggestions it would be much appreciated.
Thank You!
So far I have tried this:
PowerMockito.doNothing().when(Whitebox.invokeMethod(spy,"method",null));
But I get this error:
No method found with name 'method' with parameter types: [ <none> ]
419
For Mockito, there is no direct support to mock private and static methods. In order to test private methods, you will need to refactor the code to change the access to protected (or package) and you will have to avoid static/final methods.
PowerMock integrates with mocking frameworks like EasyMock and Mockito and is meant to add additional functionality to these – such as mocking private methods, final classes, and final methods, etc. It does that by relying on bytecode manipulation and an entirely separate classloader.
If we want to access Private Field and method using Reflection we just need to call setAccessible(true) on the field or method object which you want to access. Class. getDeclaredField(String fieldName) or Class. getDeclaredFields() can be used to get private fields.
Mockito provides following methods that can be used to mock void methods. doAnswer() : We can use this to perform some operations when a mocked object method is called that is returning void. doThrow() : We can use doThrow() when we want to stub a void method that throws exception.
I haven't tried Whitebox (which comes with Powermock), but try something like:
@RunWith(PowerMockRunner.class)
@PrepareForTest(MyClass.class)
public class MyClassTest {
private MyClass myClass;
@Before
public void setup() {
myClass = PowerMockito.spy(new MyClass());
PowerMockito.doNothing().when(myClass, "myPrivateMethod");
}
//Tests..
}
.. as far as I can remember..
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