A Mock object is something used for unit testing. If you have an object whose methods you want to test, and those methods depend on some other object, you create a mock of the dependency rather than an actual instance of that dependency. This allows you to test your object in isolation. Common Java frameworks … Read more
JUnit is a framework that helps with writing and running your unit tests. Mockito (or any other mocking tool) is a framework that you specifically use to efficiently write certain kind of tests. At it’s core, any mocking framework allows you omit instantiating “real” objects of production classes, instead the mocking framework creates a stub … Read more
Check the Java API for List.The get(int index) method is declared to throw only the IndexOutOfBoundException which extends RuntimeException.You are trying to tell Mockito to throw an exception SomeException() that is not valid to be thrown by that particular method call. To clarify further.The List interface does not provide for a checked Exception to be thrown from the get(int index) method and that is why Mockito is failing.When … Read more
Stub I believe the biggest distinction is that a stub you have already written with predetermined behavior. So you would have a class that implements the dependency (abstract class or interface most likely) you are faking for testing purposes and the methods would just be stubbed out with set responses. They would not do anything … Read more
Use PowerMockito on top of Mockito. Example code: More information: Why doesn’t Mockito mock static methods?
Edit: Several years have passed and this isn’t really the right way to do this any more (and probably never was, my bad). Mutating an imported module is nasty and can lead to side effects like tests that pass or fail depending on execution order. I’m leaving this answer in its original form for historical … Read more
The short answer is that in your example, the result of mock.method() will be a type-appropriate empty value; mockito uses indirection via proxying, method interception, and a shared instance of the MockingProgress class in order to determine whether an invocation of a method on a mock is for stubbing or replay of an existing stubbed behavior rather than passing … Read more