Investigate claim on SO regarding ctx cache in TCF

This commit introduces a test that investigates a claim made on Stack
Overflow regarding context caching in the TestContext Framework (TCF).

Author: sbrannen

spring-test/src/test/java/org/springframework/test/context/support/AbstractContextLoaderUtilsTests.java

@@ -36,6 +36,7 @@
 import org.springframework.test.context.ContextLoader;
 import org.springframework.test.context.MergedContextConfiguration;
 import org.springframework.test.context.TestContextBootstrapper;
+import org.springframework.test.context.web.WebAppConfiguration;
 
 import static org.junit.Assert.*;
 
@@ -170,6 +171,10 @@ static class LocationsFoo {
 	static class ClassesFoo {
 	}
 
+	@WebAppConfiguration
+	static class WebClassesFoo extends ClassesFoo {
+	}
+
 	@ContextConfiguration(locations = "/bar.xml", inheritLocations = true, loader = AnnotationConfigContextLoader.class)
 	@ActiveProfiles("bar")
 	static class LocationsBar extends LocationsFoo {

spring-test/src/test/java/org/springframework/test/context/support/ContextLoaderUtilsMergedConfigTests.java

@@ -25,6 +25,10 @@
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.ContextLoader;
 import org.springframework.test.context.MergedContextConfiguration;
+import org.springframework.test.context.web.WebDelegatingSmartContextLoader;
+import org.springframework.test.context.web.WebMergedContextConfiguration;
+
+import static org.junit.Assert.*;
 
 /**
  * Unit tests for {@link ContextLoaderUtils} involving {@link MergedContextConfiguration}.
@@ -94,6 +98,28 @@ public void buildMergedConfigWithLocalAnnotationAndClasses() {
 			DelegatingSmartContextLoader.class);
 	}
 
+	/**
+	 * Introduced to investigate claims made in a discussion on
+	 * <a href="http://stackoverflow.com/questions/24725438/what-could-cause-a-class-implementing-applicationlistenercontextrefreshedevent">Stack Overflow</a>.
+	 */
+	@Test
+	public void buildMergedConfigWithAtWebAppConfigurationWithAnnotationAndClassesOnSuperclass() {
+		Class<?> webTestClass = WebClassesFoo.class;
+		Class<?> standardTestClass = ClassesFoo.class;
+		WebMergedContextConfiguration webMergedConfig = (WebMergedContextConfiguration) buildMergedContextConfiguration(webTestClass);
+		MergedContextConfiguration standardMergedConfig = buildMergedContextConfiguration(standardTestClass);
+
+		assertEquals(webMergedConfig, webMergedConfig);
+		assertEquals(standardMergedConfig, standardMergedConfig);
+		assertNotEquals(standardMergedConfig, webMergedConfig);
+		assertNotEquals(webMergedConfig, standardMergedConfig);
+
+		assertMergedConfig(webMergedConfig, webTestClass, EMPTY_STRING_ARRAY, new Class<?>[] { FooConfig.class },
+			WebDelegatingSmartContextLoader.class);
+		assertMergedConfig(standardMergedConfig, standardTestClass, EMPTY_STRING_ARRAY,
+			new Class<?>[] { FooConfig.class }, DelegatingSmartContextLoader.class);
+	}
+
 	@Test
 	public void buildMergedConfigWithLocalAnnotationAndOverriddenContextLoaderAndLocations() {
 		Class<?> testClass = PropertiesLocationsFoo.class;