Allow @ResourceLock on @ClassTemplate classes

junit-jupiter-engine/src/main/java/org/junit/jupiter/engine/descriptor/ClassTemplateInvocationTestDescriptor.java

@@ -10,6 +10,7 @@
 
 package org.junit.jupiter.engine.descriptor;
 
+import static java.util.Collections.emptySet;
 import static java.util.Objects.requireNonNull;
 import static org.apiguardian.api.API.Status.INTERNAL;
 import static org.junit.jupiter.engine.descriptor.CallbackSupport.invokeAfterCallbacks;
@@ -36,6 +37,7 @@
 import org.junit.jupiter.engine.extension.MutableExtensionRegistry;
 import org.junit.platform.engine.TestSource;
 import org.junit.platform.engine.UniqueId;
+import org.junit.platform.engine.support.hierarchical.ExclusiveResource;
 import org.junit.platform.engine.support.hierarchical.ThrowableCollector;
 
 /**
@@ -112,6 +114,12 @@ public Function<ResourceLocksProvider, Set<ResourceLocksProvider.Lock>> getResou
 
 	// --- Node ----------------------------------------------------------------
 
+	@Override
+	public Set<ExclusiveResource> getExclusiveResources() {
+		// Resources are already collected and returned by the enclosing ClassTemplateTestDescriptor
+		return emptySet();
+	}
+
 	@Override
 	public JupiterEngineExecutionContext prepare(JupiterEngineExecutionContext context) {
 		MutableExtensionRegistry registry = context.getExtensionRegistry();

jupiter-tests/src/test/java/org/junit/jupiter/engine/ClassTemplateInvocationTests.java

@@ -79,6 +79,7 @@
 import org.junit.jupiter.api.extension.ParameterResolutionException;
 import org.junit.jupiter.api.extension.ParameterResolver;
 import org.junit.jupiter.api.extension.RegisterExtension;
+import org.junit.jupiter.api.parallel.ResourceLock;
 import org.junit.jupiter.engine.descriptor.ClassTemplateInvocationTestDescriptor;
 import org.junit.jupiter.engine.descriptor.ClassTemplateTestDescriptor;
 import org.junit.jupiter.engine.descriptor.ClassTestDescriptor;
@@ -1004,6 +1005,14 @@ void ignoresComposedAnnotations() {
 		assertThat(engineDescriptor.getDescendants()).isEmpty();
 	}
 
+	@Test
+	void classTemplateWithResourceLockExecutesSuccessfully() {
+		var results = executeTestsForClass(ClassTemplateWithResourceLockTestCase.class);
+
+		results.testEvents().assertStatistics(stats -> stats.started(2).succeeded(2));
+		results.containerEvents().assertStatistics(stats -> stats.started(4).succeeded(4));
+	}
+
 	// -------------------------------------------------------------------
 
 	private static Stream<String> allReportEntryValues(EngineExecutionResults results) {
@@ -1567,4 +1576,15 @@ void test() {
 		}
 	}
 
+	@SuppressWarnings("JUnitMalformedDeclaration")
+	@ClassTemplate
+	@ExtendWith(TwoInvocationsClassTemplateInvocationContextProvider.class)
+	@ResourceLock("test-resource")
+	static class ClassTemplateWithResourceLockTestCase {
+		@Test
+		void test() {
+			// This test verifies that @ResourceLock works with @ClassTemplate (issue #5155)
+		}
+	}
+
 }