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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.*;
import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.RetentionPolicy.*;

/**
 * Indicates a mock field or a mock parameter for which all classes extending/implementing the
 * {@linkplain Mocked mocked} type will also get mocked.
 * 
 * Future instances of a capturing mocked type (ie, instances created sometime later during the test) will
 * become associated with the mock field/parameter.
 * When recording or verifying expectations on the mock field/parameter, these associated instances are regarded as
 * equivalent to the original mocked instance created for the mock field/parameter.
 * 

 * The {@link #maxInstances} attribute allows an upper limit to the number of future instances to be specified.
 * If multiple capturing mock fields/parameters of the same type are declared, this attribute can be used so that each
 * distinct instance gets associated with a separate mock field/parameter.
 * In turn, this allows different expectations to be recorded and/or verified for each grouping of future instances,
 * with each expectation using a different mock field/parameter.
 *
 * @see Tutorial
 */
@Retention(RUNTIME)
@Target({FIELD, PARAMETER})
public @interface Capturing
{
   /**
    * This attribute specifies the maximum number of new instances to be covered by the capturing mock field/parameter.
    * 

    * Every eligible new instance (ie, one whose type is assignable to the capturing mocked type and which gets created
    * from the code under test) is automatically associated with the corresponding mock field or mock parameter.
    * For the purpose of matching invocations from code under test to recorded or verified expectations, such associated
    * instances are regarded as equivalent to the original mocked instance created for the mock field/parameter.
    * 
    * It is valid to declare two or more mock fields/parameters of the same mocked type with a positive number of
    * maxInstances for each one of them, say n1, n2, etc.
    * In this case, the first n1 new instances will be associated with the first field/parameter, the following
    * n2 new instances to the second, and so on.
    */
   int maxInstances() default Integer.MAX_VALUE;
}