[SPR-8387] Fleshing out the implementation of processContextConfiguration() in DelegatingSmartContextLoader.

org.springframework.test/src/main/java/org/springframework/test/context/support/DelegatingSmartContextLoader.java

@@ -26,6 +26,7 @@ import org.springframework.test.context.ContextConfigurationAttributes;
 import org.springframework.test.context.ContextLoader;
 import org.springframework.test.context.MergedContextConfiguration;
 import org.springframework.test.context.SmartContextLoader;
+import org.springframework.util.Assert;
 import org.springframework.util.ObjectUtils;
 
 /**
@@ -59,14 +60,20 @@ public class DelegatingSmartContextLoader implements SmartContextLoader {
 		return false;
 	}
 
+	/**
+	 * TODO Document emptyResources().
+	 */
+	private boolean emptyResources(ContextConfigurationAttributes configAttributes) {
+		return ObjectUtils.isEmpty(configAttributes.getLocations())
+				&& ObjectUtils.isEmpty(configAttributes.getClasses());
+	}
+
 	/**
 	 * TODO Document processContextConfiguration() implementation.
 	 */
 	public void processContextConfiguration(ContextConfigurationAttributes configAttributes) {
 
-		final String[] originalLocations = configAttributes.getLocations();
-		final Class<?>[] originalClasses = configAttributes.getClasses();
-		final boolean emptyResources = ObjectUtils.isEmpty(originalLocations) && ObjectUtils.isEmpty(originalClasses);
+		final boolean emptyResources = emptyResources(configAttributes);
 
 		for (SmartContextLoader loader : candidates) {
 			if (logger.isDebugEnabled()) {
@@ -74,42 +81,43 @@ public class DelegatingSmartContextLoader implements SmartContextLoader {
 					loader.getClass().getName(), configAttributes));
 			}
 
-			// TODO Implement processContextConfiguration().
-			//
-			// If the original locations and classes are not empty, there's no
+			// If the original locations and classes were not empty, there's no
 			// need to bother with default generation checks; just let each
 			// loader process the configuration.
 			if (!emptyResources) {
 				loader.processContextConfiguration(configAttributes);
 			}
-			// Otherwise, if a loader claims to generate defaults, let it
-			// process the configuration, and then verify that it actually did
-			// generate defaults.
-			//
-			// If it generated defaults, there's no need to delegate to
-			// additional candidates. So:
-			// 1) stop iterating
-			// 2) mark the current loader as the winning candidate (?)
-			// 3) log an info message.
-			else {
-				if (loader.generatesDefaults()) {
-					loader.processContextConfiguration(configAttributes);
+			// Otherwise, if the loader claims to generate defaults, let it
+			// process the configuration.
+			else if (loader.generatesDefaults()) {
+				loader.processContextConfiguration(configAttributes);
+				if (!emptyResources(configAttributes) && logger.isInfoEnabled()) {
+					logger.info(String.format("SmartContextLoader candidate %s "
+							+ "generated defaults for context configuration [%s].", loader, configAttributes));
 				}
 			}
 		}
+
 		// If any loader claims to generate defaults but none actually did,
 		// throw an exception.
+		if (generatesDefaults() && emptyResources(configAttributes)) {
+			throw new IllegalStateException(String.format("None of the SmartContextLoader candidates %s "
+					+ "was able to generate defaults for context configuration [%s].", candidates, configAttributes));
+		}
 	}
 
 	/**
 	 * TODO Document supports(MergedContextConfiguration) implementation.
 	 */
 	public boolean supports(MergedContextConfiguration mergedConfig) {
+		Assert.notNull(mergedConfig, "mergedConfig must not be null");
+
 		for (SmartContextLoader loader : candidates) {
 			if (loader.supports(mergedConfig)) {
 				return true;
 			}
 		}
+
 		return false;
 	}
 
@@ -117,6 +125,7 @@ public class DelegatingSmartContextLoader implements SmartContextLoader {
 	 * TODO Document loadContext(MergedContextConfiguration) implementation.
 	 */
 	public ApplicationContext loadContext(MergedContextConfiguration mergedConfig) throws Exception {
+		Assert.notNull(mergedConfig, "mergedConfig must not be null");
 
 		for (SmartContextLoader loader : candidates) {
 

org.springframework.test/src/test/java/org/springframework/test/context/TestContextManagerTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2008 the original author or authors.
+ * Copyright 2002-2011 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.
@@ -53,9 +53,13 @@ public class TestContextManagerTests {
 
 	protected static final Log logger = LogFactory.getLog(TestContextManagerTests.class);
 
-	private TestContextManager testContextManager = null;
+	private final TestContextManager testContextManager = new TestContextManager(ExampleTestCase.class);
 
 
+	private Method getTestMethod() throws NoSuchMethodException {
+		return ExampleTestCase.class.getDeclaredMethod("exampleTestMethod", (Class<?>[]) null);
+	}
+
 	/**
 	 * Asserts the <em>execution order</em> of 'before' and 'after' test method
 	 * calls on {@link TestExecutionListener listeners} registered for the
@@ -108,16 +112,10 @@ public class TestContextManagerTests {
 
 	@Before
 	public void setUpTestContextManager() throws Throwable {
-
-		final Method testMethod = ExampleTestCase.class.getDeclaredMethod("exampleTestMethod", (Class<?>[]) null);
-		this.testContextManager = new TestContextManager(ExampleTestCase.class);
-		this.testContextManager.registerTestExecutionListeners(new NamedTestExecutionListener(FIRST),
-			new NamedTestExecutionListener(SECOND), new NamedTestExecutionListener(THIRD));
-
-		assertEquals("Verifying the number of registered TestExecutionListeners.", 6,
+		assertEquals("Verifying the number of registered TestExecutionListeners.", 3,
 			this.testContextManager.getTestExecutionListeners().size());
 
-		this.testContextManager.beforeTestMethod(new ExampleTestCase(), testMethod);
+		this.testContextManager.beforeTestMethod(new ExampleTestCase(), getTestMethod());
 	}
 
 	/**
@@ -133,13 +131,11 @@ public class TestContextManagerTests {
 
 	@After
 	public void tearDownTestContextManager() throws Throwable {
-		final Method testMethod = ExampleTestCase.class.getDeclaredMethod("exampleTestMethod", (Class<?>[]) null);
-		this.testContextManager.afterTestMethod(new ExampleTestCase(), testMethod, null);
-		this.testContextManager = null;
+		this.testContextManager.afterTestMethod(new ExampleTestCase(), getTestMethod(), null);
 	}
 
 
-	@ContextConfiguration
+	@TestExecutionListeners({ FirstTel.class, SecondTel.class, ThirdTel.class })
 	private static class ExampleTestCase {
 
 		@SuppressWarnings("unused")
@@ -158,13 +154,13 @@ public class TestContextManagerTests {
 		}
 
 		@Override
-		public void afterTestMethod(final TestContext testContext) {
-			afterTestMethodCalls.add(this.name);
+		public void beforeTestMethod(final TestContext testContext) {
+			beforeTestMethodCalls.add(this.name);
 		}
 
 		@Override
-		public void beforeTestMethod(final TestContext testContext) {
-			beforeTestMethodCalls.add(this.name);
+		public void afterTestMethod(final TestContext testContext) {
+			afterTestMethodCalls.add(this.name);
 		}
 
 		@Override
@@ -173,4 +169,25 @@ public class TestContextManagerTests {
 		}
 	}
 
+	private static class FirstTel extends NamedTestExecutionListener {
+
+		public FirstTel() {
+			super(FIRST);
+		}
+	}
+
+	private static class SecondTel extends NamedTestExecutionListener {
+
+		public SecondTel() {
+			super(SECOND);
+		}
+	}
+
+	private static class ThirdTel extends NamedTestExecutionListener {
+
+		public ThirdTel() {
+			super(THIRD);
+		}
+	}
+
 }

org.springframework.test/src/test/java/org/springframework/test/context/support/DelegatingSmartContextLoaderTests.java

@@ -30,8 +30,8 @@ import org.springframework.test.context.MergedContextConfiguration;
  */
 public class DelegatingSmartContextLoaderTests {
 
-	private static final Class<?>[] EMPTY_CLASS_ARRAY = new Class<?>[0];
 	private static final String[] EMPTY_STRING_ARRAY = new String[0];
+	private static final Class<?>[] EMPTY_CLASS_ARRAY = new Class<?>[0];
 
 	private final DelegatingSmartContextLoader loader = new DelegatingSmartContextLoader();
 
@@ -48,6 +48,12 @@ public class DelegatingSmartContextLoaderTests {
 		// TODO test processContextConfiguration().
 	}
 
+	@Test(expected = IllegalArgumentException.class)
+	public void doesNotSupportNullConfig() {
+		MergedContextConfiguration mergedConfig = null;
+		loader.supports(mergedConfig);
+	}
+
 	@Test
 	public void doesNotSupportEmptyConfig() {
 		MergedContextConfiguration mergedConfig = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
@@ -76,6 +82,19 @@ public class DelegatingSmartContextLoaderTests {
 		assertTrue(loader.supports(mergedConfig));
 	}
 
+	@Test(expected = IllegalArgumentException.class)
+	public void loadContextWithNullConfig() throws Exception {
+		MergedContextConfiguration mergedConfig = null;
+		loader.loadContext(mergedConfig);
+	}
+
+	@Test(expected = IllegalStateException.class)
+	public void loadContextWithoutLocationsAndConfigurationClasses() throws Exception {
+		MergedContextConfiguration mergedConfig = new MergedContextConfiguration(getClass(), EMPTY_STRING_ARRAY,
+			EMPTY_CLASS_ARRAY, EMPTY_STRING_ARRAY, loader);
+		loader.loadContext(mergedConfig);
+	}
+
 	@Test
 	public void loadContext() {
 		// TODO test loadContext().