GH-173 - Support for @ApplicationModuleTest in JUnit 5 nested test classes.

We now use Spring Test Context's TestContextAnnotationUtils to lookup the @ApplicationModuleTest annotation to eventually bootstrap an ApplicationModules instance. That ensures that we find the annotation on JUnit 5's @nested classes.

Author: odrotbohm

spring-modulith-integration-test/src/test/java/com/acme/myproject/moduleA/ApplicationModuleTestIntegrationTests.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2023 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
+ *
+ *      https://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 com.acme.myproject.moduleA;
+
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+import org.springframework.modulith.test.ApplicationModuleTest;
+
+/**
+ * Integration tests for {@link ApplicationModuleTest}.
+ *
+ * @author Oliver Drotbohm
+ */
+@ApplicationModuleTest(verifyAutomatically = false)
+class ApplicationModuleTestIntegrationTests {
+
+	@Test // GH-173
+	void bootstrapsFirstLevelTestMethod() {}
+
+	@Nested
+	class SomeNestedClass {
+
+		@Test // GH-173
+		void bootstrapsSecondLevelMestMethod() {}
+	}
+}

spring-modulith-test/src/main/java/org/springframework/modulith/test/ModuleContextCustomizerFactory.java

@@ -25,12 +25,12 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.context.ConfigurableApplicationContext;
-import org.springframework.core.annotation.AnnotatedElementUtils;
 import org.springframework.modulith.core.ApplicationModule;
 import org.springframework.test.context.ContextConfigurationAttributes;
 import org.springframework.test.context.ContextCustomizer;
 import org.springframework.test.context.ContextCustomizerFactory;
 import org.springframework.test.context.MergedContextConfiguration;
+import org.springframework.test.context.TestContextAnnotationUtils;
 
 /**
  * @author Oliver Drotbohm
@@ -45,9 +45,9 @@ class ModuleContextCustomizerFactory implements ContextCustomizerFactory {
 	public ContextCustomizer createContextCustomizer(Class<?> testClass,
 			List<ContextConfigurationAttributes> configAttributes) {
 
-		var moduleTest = AnnotatedElementUtils.getMergedAnnotation(testClass, ApplicationModuleTest.class);
+		var moduleTest = TestContextAnnotationUtils.findAnnotationDescriptor(testClass, ApplicationModuleTest.class);
 
-		return moduleTest == null ? null : new ModuleContextCustomizer(testClass);
+		return moduleTest == null ? null : new ModuleContextCustomizer(moduleTest.getRootDeclaringClass());
 	}
 
 	static class ModuleContextCustomizer implements ContextCustomizer {