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JMockit is a Java toolkit for automated developer testing. It contains APIs for the creation of the objects to be tested, for mocking dependencies, and for faking external APIs; JUnit (4 & 5) and TestNG test runners are supported. It also contains an advanced code coverage tool.

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/*
 * Copyright (c) 2006 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit;

import java.lang.annotation.*;

/**
 * Used inside a {@linkplain MockUp fake} class to indicate a fake method whose implementation will temporarily
 * replace the implementation of a matching "real" method.
 * 
 * The fake method must have the same name and the same parameters as the matching real method, except for an optional
 * first parameter of type {@link Invocation}; if this extra parameter is present, the remaining ones must match the
 * parameters in the real method.
 * The fake method must also have the same return type as the matching real method.
 * 

 * Method modifiers (public, final, static, etc.) between fake and faked methods
 * don't have to be the same.
 * It's perfectly fine to have a non-static fake method for a static faked method (or vice-versa),
 * for example.
 * Checked exceptions in the throws clause (if any) can also differ between the two matching methods.
 * 

 * A fake method can also target a constructor, in which case the previous considerations still apply,
 * except for the name of the fake method which must be "$init".
 * 

 * Another special fake method, "void $clinit()", will target the static
 * initializers of the faked class, if present in the fake class.
 * 
 * Yet another special fake method is "Object $advice(Invocation)", which if defined will
 * match every method in the target class hierarchy.
 *
 * @see Tutorial
 */
@Inherited
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface Mock
{
}