Register runtime hint for @WebAppConfiguration's resource path

This commit introduces automatic registration of a runtime hint for
classpath resources configured via the `value` attribute in
@WebAppConfiguration.

Closes gh-29026

spring-test/src/main/java/org/springframework/test/context/aot/TestContextAotGenerator.java

@@ -42,6 +42,7 @@ import org.springframework.test.context.ContextLoader;
 import org.springframework.test.context.MergedContextConfiguration;
 import org.springframework.test.context.SmartContextLoader;
 import org.springframework.test.context.TestContextBootstrapper;
+import org.springframework.test.context.web.WebMergedContextConfiguration;
 import org.springframework.util.Assert;
 import org.springframework.util.LinkedMultiValueMap;
 import org.springframework.util.MultiValueMap;
@@ -60,6 +61,8 @@ import static org.springframework.util.ResourceUtils.CLASSPATH_URL_PREFIX;
  */
 public class TestContextAotGenerator {
 
+	private static final String SLASH = "/";
+
 	private static final Log logger = LogFactory.getLog(TestContextAotGenerator.class);
 
 	private final ApplicationContextAotGenerator aotGenerator = new ApplicationContextAotGenerator();
@@ -251,6 +254,21 @@ public class TestContextAotGenerator {
 
 		// @TestPropertySource(locations = ... )
 		registerHintsForClasspathResources(mergedConfig.getPropertySourceLocations());
+
+		if (mergedConfig instanceof WebMergedContextConfiguration webMergedConfig) {
+			String resourceBasePath = webMergedConfig.getResourceBasePath();
+			if (resourceBasePath.startsWith(CLASSPATH_URL_PREFIX)) {
+				String pattern = resourceBasePath.substring(CLASSPATH_URL_PREFIX.length());
+				if (!pattern.startsWith(SLASH)) {
+					pattern = SLASH + pattern;
+				}
+				if (!pattern.endsWith(SLASH)) {
+					pattern += SLASH;
+				}
+				pattern += "*";
+				this.runtimeHints.resources().registerPattern(pattern);
+			}
+		}
 	}
 
 	private void registerHintsForClasspathResources(String... locations) {
@@ -258,8 +276,8 @@ public class TestContextAotGenerator {
 				.filter(location -> location.startsWith(CLASSPATH_URL_PREFIX))
 				.map(location -> {
 					location = location.substring(CLASSPATH_URL_PREFIX.length());
-					if (!location.startsWith("/")) {
-						location = "/" + location;
+					if (!location.startsWith(SLASH)) {
+						location = SLASH + location;
 					}
 					return location;
 				})

spring-test/src/test/java/org/springframework/test/context/aot/TestContextAotGeneratorTests.java

@@ -172,9 +172,13 @@ class TestContextAotGeneratorTests extends AbstractAotTests {
 		assertThat(resource().forResource("/org/springframework/test/context/aot/samples/xml/test-config.xml"))
 			.accepts(runtimeHints);
 
-		// @TestPropertySource(locations = ... )
+		// @TestPropertySource(locations = ...)
 		assertThat(resource().forResource("/org/springframework/test/context/aot/samples/basic/BasicSpringVintageTests.properties"))
 			.accepts(runtimeHints);
+
+		// @WebAppConfiguration(value = ...)
+		assertThat(resource().forResource("/META-INF/web-resources/resources/Spring.js")).accepts(runtimeHints);
+		assertThat(resource().forResource("/META-INF/web-resources/WEB-INF/views/home.jsp")).accepts(runtimeHints);
 	}
 
 	private static void assertReflectionRegistered(RuntimeHints runtimeHints, String type, MemberCategory memberCategory) {
@@ -328,9 +332,9 @@ class TestContextAotGeneratorTests extends AbstractAotTests {
 			"org/springframework/test/context/aot/samples/web/WebSpringJupiterTests__TestContext005_ApplicationContextInitializer.java",
 			"org/springframework/test/context/aot/samples/web/WebSpringJupiterTests__TestContext005_BeanFactoryRegistrations.java",
 			"org/springframework/test/context/aot/samples/web/WebTestConfiguration__TestContext005_BeanDefinitions.java",
-			"org/springframework/web/reactive/config/DelegatingWebFluxConfiguration__TestContext005_Autowiring.java",
-			"org/springframework/web/reactive/config/DelegatingWebFluxConfiguration__TestContext005_BeanDefinitions.java",
-			"org/springframework/web/reactive/config/WebFluxConfigurationSupport__TestContext005_BeanDefinitions.java",
+			"org/springframework/web/servlet/config/annotation/DelegatingWebMvcConfiguration__TestContext005_Autowiring.java",
+			"org/springframework/web/servlet/config/annotation/DelegatingWebMvcConfiguration__TestContext005_BeanDefinitions.java",
+			"org/springframework/web/servlet/config/annotation/WebMvcConfigurationSupport__TestContext005_BeanDefinitions.java",
 			// XmlSpringJupiterTests
 			"org/springframework/context/event/DefaultEventListenerFactory__TestContext006_BeanDefinitions.java",
 			"org/springframework/context/event/EventListenerMethodProcessor__TestContext006_BeanDefinitions.java",

spring-test/src/test/java/org/springframework/test/context/aot/samples/web/WebSpringJupiterTests.java

@@ -24,6 +24,7 @@ import org.springframework.test.web.servlet.MockMvc;
 import org.springframework.web.context.WebApplicationContext;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.hamcrest.Matchers.containsString;
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
@@ -33,7 +34,7 @@ import static org.springframework.test.web.servlet.setup.MockMvcBuilders.webAppC
  * @author Sam Brannen
  * @since 6.0
  */
-@SpringJUnitWebConfig(WebTestConfiguration.class)
+@SpringJUnitWebConfig(classes = WebTestConfiguration.class, resourcePath = "classpath:META-INF/web-resources")
 @TestPropertySource(properties = "test.engine = jupiter")
 public class WebSpringJupiterTests {
 
@@ -49,7 +50,7 @@ public class WebSpringJupiterTests {
 	}
 
 	@org.junit.jupiter.api.Test
-	void test(@Value("${test.engine}") String testEngine) throws Exception {
+	void controller(@Value("${test.engine}") String testEngine) throws Exception {
 		assertThat(testEngine)
 			.as("@Value").isEqualTo("jupiter");
 		assertThat(wac.getEnvironment().getProperty("test.engine"))
@@ -59,4 +60,13 @@ public class WebSpringJupiterTests {
 			.andExpectAll(status().isOk(), content().string("Hello, AOT!"));
 	}
 
+	@org.junit.jupiter.api.Test
+	void resources() throws Exception {
+		this.mockMvc.perform(get("/resources/Spring.js"))
+			.andExpectAll(
+				content().contentType("application/javascript"),
+				content().string(containsString("Spring={};"))
+			);
+	}
+
 }

spring-test/src/test/java/org/springframework/test/context/aot/samples/web/WebTestConfiguration.java

@@ -18,19 +18,26 @@ package org.springframework.test.context.aot.samples.web;
 
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.web.reactive.config.EnableWebFlux;
+import org.springframework.web.servlet.config.annotation.EnableWebMvc;
+import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 
 /**
  * @author Sam Brannen
  * @since 6.0
  */
 @Configuration(proxyBeanMethods = false)
-@EnableWebFlux
-class WebTestConfiguration {
+@EnableWebMvc
+class WebTestConfiguration implements WebMvcConfigurer {
 
 	@Bean
 	MessageController messageController() {
 		return new MessageController();
 	}
 
+	@Override
+	public void addResourceHandlers(ResourceHandlerRegistry registry) {
+		registry.addResourceHandler("/resources/**").addResourceLocations("/resources/");
+	}
+
 }

src/checkstyle/checkstyle-suppressions.xml

@@ -88,6 +88,7 @@
 	<suppress files="src[\\/]main[\\/]java[\\/]org[\\/]springframework[\\/]test[\\/]web[\\/]servlet[\\/]result[\\/].+Matchers" checks="IllegalImport" id="bannedHamcrestImports"/>
 	<!-- spring-test - test -->
 	<suppress files="src[\\/]test[\\/]java[\\/]org[\\/]springframework[\\/]test[\\/].+TestNGTests" checks="IllegalImport" id="bannedTestNGImports"/>
+	<suppress files="src[\\/]test[\\/]java[\\/]org[\\/]springframework[\\/]test[\\/]context[\\/]aot[\\/]samples[\\/]web[\\/].+Tests" checks="IllegalImport" id="bannedHamcrestImports"/>
 	<suppress files="src[\\/]test[\\/]java[\\/]org[\\/]springframework[\\/]test[\\/]context[\\/]junit[\\/]jupiter[\\/]web[\\/].+Tests" checks="IllegalImport" id="bannedHamcrestImports"/>
 	<suppress files="src[\\/]test[\\/]java[\\/]org[\\/]springframework[\\/]test[\\/]util[\\/].+Tests" checks="IllegalImport" id="bannedHamcrestImports"/>
 	<suppress files="src[\\/]test[\\/]java[\\/]org[\\/]springframework[\\/]test[\\/]web[\\/](client|reactive|servlet)[\\/].+Tests" checks="IllegalImport" id="bannedHamcrestImports"/>