package org.junit.runner;

import java.lang.annotation.ElementType;

import java.lang.annotation.Inherited;

import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

import java.lang.annotation.Target;

/**

 * When a class is annotated with <code>@RunWith</code> or extends a class annotated

 * with <code>@RunWith</code>, JUnit will invoke the class it references to run the

 * tests in that class instead of the runner built into JUnit. We added this feature late

 * in development. While it seems powerful we expect the runner API to change as we learn

 * how people really use it. Some of the classes that are currently internal will likely

 * be refined and become public.

 *

 * For example, suites in JUnit 4 are built using RunWith, and a custom runner named Suite:

 *

 * <pre>

 * @RunWith(Suite.class)

 * @SuiteClasses({ATest.class, BTest.class, CTest.class})

 * public class ABCSuite {

 * }

 * </pre>

 *

 * @since 4.0

 */

@Retention(RetentionPolicy.RUNTIME)

@Target(ElementType.TYPE)

@Inherited

public @interface RunWith {

    /**

     * @return a Runner class (must have a constructor that takes a single Class to run)

     */

    Class<? extends Runner> value();

}