GH-449 - Guard against AutoConfiguration- and EntityScanPackages bean definitions not having any constructor argument defined.

spring-modulith-test/src/test/java/org/springframework/modulith/test/ModuleTestAutoConfigurationUnitTests.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2024 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 org.springframework.modulith.test;
+
+import static org.assertj.core.api.Assertions.*;
+
+import java.util.Collections;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.support.DefaultListableBeanFactory;
+import org.springframework.beans.factory.support.RootBeanDefinition;
+import org.springframework.boot.autoconfigure.AutoConfigurationPackages;
+
+/**
+ * Unit tests for {@link ModuleTestAutoConfiguration}.
+ *
+ * @author Oliver Drotbohm
+ */
+class ModuleTestAutoConfigurationUnitTests {
+
+	@Test // GH-449
+	void handlesNoConstructorArgumentOnPackagesBeanDefinition() {
+
+		var definition = new RootBeanDefinition(AutoConfigurationPackages.class);
+		var factory = new DefaultListableBeanFactory();
+		factory.registerBeanDefinition(ModuleTestAutoConfiguration.AUTOCONFIG_PACKAGES, definition);
+
+		assertThatNoException().isThrownBy(() -> {
+			new ModuleTestAutoConfiguration.AutoConfigurationAndEntityScanPackageCustomizer()
+					.setBasePackagesOn(factory, ModuleTestAutoConfiguration.AUTOCONFIG_PACKAGES, Collections.emptyList());
+		});
+	}
+}