Polish "Prevent container to be closed twice"

See gh-35120

spring-boot-project/spring-boot-testcontainers/src/test/java/org/springframework/boot/testcontainers/lifecycle/TestcontainersLifecycleApplicationContextInitializerTests.java

@@ -0,0 +1,59 @@
+/*
+ * Copyright 2012-2023 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 org.springframework.boot.testcontainers.lifecycle;
+
+import org.junit.jupiter.api.Test;
+import org.testcontainers.lifecycle.Startable;
+
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+
+import static org.mockito.BDDMockito.then;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+
+/**
+ * Tests for {@link TestcontainersLifecycleApplicationContextInitializer}.
+ *
+ * @author Stephane Nicoll
+ */
+class TestcontainersLifecycleApplicationContextInitializerTests {
+
+	@Test
+	void whenStartableBeanInvokesStartOnRefresh() {
+		Startable container = mock(Startable.class);
+		try (AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext()) {
+			applicationContext.registerBean("container", Startable.class, () -> container);
+			new TestcontainersLifecycleApplicationContextInitializer().initialize(applicationContext);
+			then(container).shouldHaveNoInteractions();
+			applicationContext.refresh();
+			then(container).should().start();
+		}
+	}
+
+	@Test
+	void whenStartableBeanInvokesDestroyOnShutdown() {
+		Startable mock = mock(Startable.class);
+		AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext();
+		applicationContext.registerBean("container", Startable.class, () -> mock);
+		new TestcontainersLifecycleApplicationContextInitializer().initialize(applicationContext);
+		applicationContext.refresh();
+		then(mock).should(never()).close();
+		applicationContext.close();
+		then(mock).should().close();
+	}
+
+}