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  * Copyright (c) 2007 Mockito contributors
  * This program is made available under the terms of the MIT License.
 package org.mockito.internal.stubbing.answers;
Optional Answer that adds partial mocking support

org.mockito.stubbing.Answer can be used to define the return values of unstubbed invocations.

This implementation can be helpful when working with legacy code. When this implementation is used, unstubbed methods will delegate to the real implementation. This is a way to create a partial mock object that calls real methods by default.

As usual you are going to read the partial mock warning: Object oriented programming is more less tackling complexity by dividing the complexity into separate, specific, SRPy objects. How does partial mock fit into this paradigm? Well, it just doesn't... Partial mock usually means that the complexity has been moved to a different method on the same object. In most cases, this is not the way you want to design your application.

However, there are rare cases when partial mocks come handy: dealing with code you cannot change easily (3rd party interfaces, interim refactoring of legacy code etc.) However, I wouldn't use partial mocks for new, test-driven & well-designed code.

public class CallsRealMethods implements Answer<Object> {
    private static final long serialVersionUID = 9057165148930624087L;
    public Object answer(InvocationOnMock invocationthrows Throwable {
        return invocation.callRealMethod();
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