/*
 * Copyright 2002-2013 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.test.context;

/**
 * {@code TestExecutionListener} defines a <em>listener</em> API for reacting to
 * test execution events published by the {@link TestContextManager} with which
 * the listener is registered.
 * <p>
 * Concrete implementations must provide a {@code public} no-args constructor,
 * so that listeners can be instantiated transparently by tools and configuration
 * mechanisms.
 * <p>
 * Spring provides the following out-of-the-box implementations:
 * <ul>
 * <li>{@link org.springframework.test.context.support.DependencyInjectionTestExecutionListener
 * DependencyInjectionTestExecutionListener}</li>
 * <li>{@link org.springframework.test.context.support.DirtiesContextTestExecutionListener
 * DirtiesContextTestExecutionListener}</li>
 * <li>{@link org.springframework.test.context.transaction.TransactionalTestExecutionListener
 * TransactionalTestExecutionListener}</li>
 * <li>{@link org.springframework.test.context.web.ServletTestExecutionListener
 * ServletTestExecutionListener}</li>
 * </ul>
 *
 * @author Sam Brannen
 * @author Juergen Hoeller
 * @since 2.5
 */
public interface TestExecutionListener {

	/**
	 * Pre-processes a test class <em>before</em> execution of all tests within
	 * the class.
	 * <p>
	 * This method should be called immediately before framework-specific
	 * <em>before class</em> lifecycle callbacks.
	 * <p>
	 * If a given testing framework (e.g., JUnit 3.8) does not support
	 * <em>before class</em> lifecycle callbacks, this method will not be called
	 * for that framework.
	 *
	 * @param testContext the test context for the test; never {@code null}
	 * @throws Exception allows any exception to propagate
	 */
	void beforeTestClass(TestContext testContext) throws Exception;

	/**
	 * Prepares the {@link Object test instance} of the supplied
	 * {@link TestContext test context}, for example by injecting dependencies.
	 * <p>
	 * This method should be called immediately after instantiation of the test
	 * instance but prior to any framework-specific lifecycle callbacks.
	 *
	 * @param testContext the test context for the test; never {@code null}
	 * @throws Exception allows any exception to propagate
	 */
	void prepareTestInstance(TestContext testContext) throws Exception;

	/**
	 * Pre-processes a test <em>before</em> execution of the
	 * {@link java.lang.reflect.Method test method} in the supplied
	 * {@link TestContext test context}, for example by setting up test
	 * fixtures.
	 * <p>
	 * This method should be called immediately prior to framework-specific
	 * <em>before</em> lifecycle callbacks.
	 *
	 * @param testContext the test context in which the test method will be
	 * executed; never {@code null}
	 * @throws Exception allows any exception to propagate
	 */
	void beforeTestMethod(TestContext testContext) throws Exception;

	/**
	 * Post-processes a test <em>after</em> execution of the
	 * {@link java.lang.reflect.Method test method} in the supplied
	 * {@link TestContext test context}, for example by tearing down test
	 * fixtures.
	 * <p>
	 * This method should be called immediately after framework-specific
	 * <em>after</em> lifecycle callbacks.
	 *
	 * @param testContext the test context in which the test method was
	 * executed; never {@code null}
	 * @throws Exception allows any exception to propagate
	 */
	void afterTestMethod(TestContext testContext) throws Exception;

	/**
	 * Post-processes a test class <em>after</em> execution of all tests within
	 * the class.
	 * <p>
	 * This method should be called immediately after framework-specific
	 * <em>after class</em> lifecycle callbacks.
	 * <p>
	 * If a given testing framework (e.g., JUnit 3.8) does not support
	 * <em>after class</em> lifecycle callbacks, this method will not be called
	 * for that framework.
	 *
	 * @param testContext the test context for the test; never {@code null}
	 * @throws Exception allows any exception to propagate
	 */
	void afterTestClass(TestContext testContext) throws Exception;

}
