xref: /external/mockito/src/org/mockito/Mock.java

/*
 * Copyright (c) 2007 Mockito contributors
 * This program is made available under the terms of the MIT License.
 */
package org.mockito;

import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

/**
 * Mark a field as a mock.
 *
 * <ul>
 * <li>Allows shorthand mock creation.</li>
 * <li>Minimizes repetitive mock creation code.</li>
 * <li>Makes the test class more readable.</li>
 * <li>Makes the verification error easier to read because the <b>field name</b> is used to identify the mock.</li>
 * </ul>
 *
 * <pre class="code"><code class="java">
 *   public class ArticleManagerTest extends SampleBaseTestCase {
 *
 *       &#064;Mock private ArticleCalculator calculator;
 *       &#064;Mock(name = "database") private ArticleDatabase dbMock;
 *       &#064;Mock(answer = RETURNS_MOCKS) private UserProvider userProvider;
 *       &#064;Mock(extraInterfaces = {Queue.class, Observer.class}) private  articleMonitor;
 *
 *       private ArticleManager manager;
 *
 *       &#064;Before public void setup() {
 *           manager = new ArticleManager(userProvider, database, calculator, articleMonitor);
 *       }
 *   }
 *
 *   public class SampleBaseTestCase {
 *
 *       &#064;Before public void initMocks() {
 *           MockitoAnnotations.initMocks(this);
 *       }
 *   }
 * </code></pre>
 *
 * <p>
 * <strong><code>MockitoAnnotations.initMocks(this)</code></strong> method has to be called to initialize annotated objects.
 * In above example, <code>initMocks()</code> is called in &#064;Before (JUnit4) method of test's base class.
 * For JUnit3 <code>initMocks()</code> can go to <code>setup()</code> method of a base class.
 * <strong>Instead</strong> you can also put initMocks() in your JUnit runner (&#064;RunWith) or use the built-in
 * {@link org.mockito.runners.MockitoJUnitRunner}.
 * </p>
 *
 * @see Mockito#mock(Class)
 * @see Spy
 * @see InjectMocks
 * @see MockitoAnnotations#initMocks(Object)
 * @see org.mockito.runners.MockitoJUnitRunner
 */
@Target(FIELD)
@Retention(RUNTIME)
@Documented
public @interface Mock {

    Answers answer() default Answers.RETURNS_DEFAULTS;

    String name() default "";

    Class<?>[] extraInterfaces() default {};

    boolean serializable() default false;
}