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/*
* Copyright 2002-2014 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;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.util.Assert;
/**
* {@code TestContextManager} is the main entry point into the Spring
* TestContext Framework, which provides support for loading and accessing
* {@link org.springframework.context.ApplicationContext application contexts},
* dependency injection of test instances,
* {@link org.springframework.transaction.annotation.Transactional transactional}
* execution of test methods, etc.
*
* Specifically, a {@code TestContextManager} is responsible for managing a
* single {@link TestContext} and signaling events to all registered
* {@link TestExecutionListener TestExecutionListeners} at well defined test
* execution points:
*
*
* - {@link #beforeTestClass() before test class execution}: prior to any
* before class methods of a particular testing framework (e.g., JUnit
* 4's {@link org.junit.BeforeClass @BeforeClass})
* - {@link #prepareTestInstance(Object) test instance preparation}:
* immediately following instantiation of the test instance
* - {@link #beforeTestMethod(Object, Method) before test method execution}:
* prior to any before methods of a particular testing framework (e.g.,
* JUnit 4's {@link org.junit.Before @Before})
* - {@link #afterTestMethod(Object, Method, Throwable) after test method
* execution}: after any after methods of a particular testing
* framework (e.g., JUnit 4's {@link org.junit.After @After})
* - {@link #afterTestClass() after test class execution}: after any
* after class methods of a particular testing framework (e.g., JUnit
* 4's {@link org.junit.AfterClass @AfterClass})
*
*
* @author Sam Brannen
* @author Juergen Hoeller
* @since 2.5
* @see BootstrapWith
* @see BootstrapContext
* @see TestContextBootstrapper
* @see TestContext
* @see TestExecutionListener
* @see TestExecutionListeners
* @see ContextConfiguration
* @see ContextHierarchy
* @see org.springframework.test.context.transaction.TransactionConfiguration
*/
public class TestContextManager {
private static final Log logger = LogFactory.getLog(TestContextManager.class);
/**
* Cache of Spring application contexts.
* This needs to be static, since test instances may be destroyed and
* recreated between invocations of individual test methods, as is the case
* with JUnit.
*/
static final ContextCache contextCache = new ContextCache();
private final TestContext testContext;
private final TestContextBootstrapper testContextBootstrapper;
private final List testExecutionListeners = new ArrayList();
/**
* Construct a new {@code TestContextManager} for the specified {@linkplain Class test class}
* and automatically {@link #registerTestExecutionListeners register} the
* {@link TestExecutionListener TestExecutionListeners} configured for the test class
* via the {@link TestExecutionListeners @TestExecutionListeners} annotation.
* @param testClass the test class to be managed
* @see #registerTestExecutionListeners
*/
public TestContextManager(Class testClass) {
CacheAwareContextLoaderDelegate cacheAwareContextLoaderDelegate = new DefaultCacheAwareContextLoaderDelegate(contextCache);
BootstrapContext bootstrapContext = new DefaultBootstrapContext(testClass, cacheAwareContextLoaderDelegate);
this.testContextBootstrapper = BootstrapUtils.resolveTestContextBootstrapper(bootstrapContext);
this.testContext = new DefaultTestContext(this.testContextBootstrapper);
registerTestExecutionListeners(this.testContextBootstrapper.getTestExecutionListeners());
}
/**
* Get the {@link TestContext} managed by this {@code TestContextManager}.
*/
protected final TestContext getTestContext() {
return this.testContext;
}
/**
* Register the supplied list of {@link TestExecutionListener TestExecutionListeners}
* by appending them to the list of listeners used by this {@code TestContextManager}.
* @see #registerTestExecutionListeners(TestExecutionListener...)
*/
public void registerTestExecutionListeners(List testExecutionListeners) {
registerTestExecutionListeners(testExecutionListeners.toArray(new TestExecutionListener[testExecutionListeners.size()]));
}
/**
* Register the supplied array of {@link TestExecutionListener TestExecutionListeners}
* by appending them to the list of listeners used by this {@code TestContextManager}.
*/
public void registerTestExecutionListeners(TestExecutionListener... testExecutionListeners) {
for (TestExecutionListener listener : testExecutionListeners) {
if (logger.isTraceEnabled()) {
logger.trace("Registering TestExecutionListener: " + listener);
}
this.testExecutionListeners.add(listener);
}
}
/**
* Get the current {@link TestExecutionListener TestExecutionListeners}
* registered for this {@code TestContextManager}.
* Allows for modifications, e.g. adding a listener to the beginning of the list.
* However, make sure to keep the list stable while actually executing tests.
*/
public final List getTestExecutionListeners() {
return this.testExecutionListeners;
}
/**
* Get a copy of the {@link TestExecutionListener TestExecutionListeners}
* registered for this {@code TestContextManager} in reverse order.
*/
private List getReversedTestExecutionListeners() {
List listenersReversed = new ArrayList(getTestExecutionListeners());
Collections.reverse(listenersReversed);
return listenersReversed;
}
/**
* Hook for pre-processing a test class before execution of any
* tests within the class. Should be called prior to any framework-specific
* before class methods (e.g., methods annotated with JUnit's
* {@link org.junit.BeforeClass @BeforeClass}).
* An attempt will be made to give each registered
* {@link TestExecutionListener} a chance to pre-process the test class
* execution. If a listener throws an exception, however, the remaining
* registered listeners will not be called.
* @throws Exception if a registered TestExecutionListener throws an
* exception
* @see #getTestExecutionListeners()
*/
public void beforeTestClass() throws Exception {
Class testClass = getTestContext().getTestClass();
if (logger.isTraceEnabled()) {
logger.trace("beforeTestClass(): class [" + testClass.getName() + "]");
}
getTestContext().updateState(null, null, null);
for (TestExecutionListener testExecutionListener : getTestExecutionListeners()) {
try {
testExecutionListener.beforeTestClass(getTestContext());
}
catch (Exception ex) {
logger.warn("Caught exception while allowing TestExecutionListener [" + testExecutionListener +
"] to process 'before class' callback for test class [" + testClass + "]", ex);
throw ex;
}
}
}
/**
* Hook for preparing a test instance prior to execution of any individual
* test methods, for example for injecting dependencies, etc. Should be
* called immediately after instantiation of the test instance.
*
The managed {@link TestContext} will be updated with the supplied
* {@code testInstance}.
*
An attempt will be made to give each registered
* {@link TestExecutionListener} a chance to prepare the test instance. If a
* listener throws an exception, however, the remaining registered listeners
* will not be called.
* @param testInstance the test instance to prepare (never {@code null})
* @throws Exception if a registered TestExecutionListener throws an exception
* @see #getTestExecutionListeners()
*/
public void prepareTestInstance(Object testInstance) throws Exception {
Assert.notNull(testInstance, "testInstance must not be null");
if (logger.isTraceEnabled()) {
logger.trace("prepareTestInstance(): instance [" + testInstance + "]");
}
getTestContext().updateState(testInstance, null, null);
for (TestExecutionListener testExecutionListener : getTestExecutionListeners()) {
try {
testExecutionListener.prepareTestInstance(getTestContext());
}
catch (Exception ex) {
logger.error("Caught exception while allowing TestExecutionListener [" + testExecutionListener +
"] to prepare test instance [" + testInstance + "]", ex);
throw ex;
}
}
}
/**
* Hook for pre-processing a test before execution of the supplied
* {@link Method test method}, for example for setting up test fixtures,
* starting a transaction, etc. Should be called prior to any
* framework-specific before methods (e.g., methods annotated with
* JUnit's {@link org.junit.Before @Before}).
*
The managed {@link TestContext} will be updated with the supplied
* {@code testInstance} and {@code testMethod}.
*
An attempt will be made to give each registered
* {@link TestExecutionListener} a chance to pre-process the test method
* execution. If a listener throws an exception, however, the remaining
* registered listeners will not be called.
* @param testInstance the current test instance (never {@code null})
* @param testMethod the test method which is about to be executed on the
* test instance
* @throws Exception if a registered TestExecutionListener throws an exception
* @see #getTestExecutionListeners()
*/
public void beforeTestMethod(Object testInstance, Method testMethod) throws Exception {
Assert.notNull(testInstance, "Test instance must not be null");
if (logger.isTraceEnabled()) {
logger.trace("beforeTestMethod(): instance [" + testInstance + "], method [" + testMethod + "]");
}
getTestContext().updateState(testInstance, testMethod, null);
for (TestExecutionListener testExecutionListener : getTestExecutionListeners()) {
try {
testExecutionListener.beforeTestMethod(getTestContext());
}
catch (Exception ex) {
logger.warn("Caught exception while allowing TestExecutionListener [" + testExecutionListener +
"] to process 'before' execution of test method [" + testMethod + "] for test instance [" +
testInstance + "]", ex);
throw ex;
}
}
}
/**
* Hook for post-processing a test after execution of the supplied
* {@link Method test method}, for example for tearing down test fixtures,
* ending a transaction, etc. Should be called after any framework-specific
* after methods (e.g., methods annotated with JUnit's
* {@link org.junit.After @After}).
*
The managed {@link TestContext} will be updated with the supplied
* {@code testInstance}, {@code testMethod}, and
* {@code exception}.
*
Each registered {@link TestExecutionListener} will be given a chance to
* post-process the test method execution. If a listener throws an
* exception, the remaining registered listeners will still be called, but
* the first exception thrown will be tracked and rethrown after all
* listeners have executed. Note that registered listeners will be executed
* in the opposite order in which they were registered.
* @param testInstance the current test instance (never {@code null})
* @param testMethod the test method which has just been executed on the
* test instance
* @param exception the exception that was thrown during execution of the
* test method or by a TestExecutionListener, or {@code null} if none
* was thrown
* @throws Exception if a registered TestExecutionListener throws an exception
* @see #getTestExecutionListeners()
*/
public void afterTestMethod(Object testInstance, Method testMethod, Throwable exception) throws Exception {
Assert.notNull(testInstance, "testInstance must not be null");
if (logger.isTraceEnabled()) {
logger.trace("afterTestMethod(): instance [" + testInstance + "], method [" + testMethod +
"], exception [" + exception + "]");
}
getTestContext().updateState(testInstance, testMethod, exception);
Exception afterTestMethodException = null;
// Traverse the TestExecutionListeners in reverse order to ensure proper
// "wrapper"-style execution of listeners.
for (TestExecutionListener testExecutionListener : getReversedTestExecutionListeners()) {
try {
testExecutionListener.afterTestMethod(getTestContext());
}
catch (Exception ex) {
logger.warn("Caught exception while allowing TestExecutionListener [" + testExecutionListener +
"] to process 'after' execution for test: method [" + testMethod + "], instance [" +
testInstance + "], exception [" + exception + "]", ex);
if (afterTestMethodException == null) {
afterTestMethodException = ex;
}
}
}
if (afterTestMethodException != null) {
throw afterTestMethodException;
}
}
/**
* Hook for post-processing a test class after execution of all
* tests within the class. Should be called after any framework-specific
* after class methods (e.g., methods annotated with JUnit's
* {@link org.junit.AfterClass @AfterClass}).
*
Each registered {@link TestExecutionListener} will be given a chance to
* post-process the test class. If a listener throws an exception, the
* remaining registered listeners will still be called, but the first
* exception thrown will be tracked and rethrown after all listeners have
* executed. Note that registered listeners will be executed in the opposite
* order in which they were registered.
* @throws Exception if a registered TestExecutionListener throws an exception
* @see #getTestExecutionListeners()
*/
public void afterTestClass() throws Exception {
Class testClass = getTestContext().getTestClass();
if (logger.isTraceEnabled()) {
logger.trace("afterTestClass(): class [" + testClass.getName() + "]");
}
getTestContext().updateState(null, null, null);
Exception afterTestClassException = null;
// Traverse the TestExecutionListeners in reverse order to ensure proper
// "wrapper"-style execution of listeners.
for (TestExecutionListener testExecutionListener : getReversedTestExecutionListeners()) {
try {
testExecutionListener.afterTestClass(getTestContext());
}
catch (Exception ex) {
logger.warn("Caught exception while allowing TestExecutionListener [" + testExecutionListener +
"] to process 'after class' callback for test class [" + testClass + "]", ex);
if (afterTestClassException == null) {
afterTestClassException = ex;
}
}
}
if (afterTestClassException != null) {
throw afterTestClassException;
}
}
}