Allow eurekaServerBootstrap.contextDestroyed to run when stopping Eureka (#3907)

* Allow eurekaServerBootstrap.contextDestroyed to run when stopping Eureka  658599

* Fix formatting and add header in test file

spring-cloud-netflix-eureka-server/src/main/java/org/springframework/cloud/netflix/eureka/server/EurekaServerInitializerConfiguration.java

@@ -108,11 +108,6 @@ public class EurekaServerInitializerConfiguration implements ServletContextAware
 		return true;
 	}
 
-	@Override
-	public void stop(Runnable callback) {
-		callback.run();
-	}
-
 	@Override
 	public int getOrder() {
 		return this.order;

spring-cloud-netflix-eureka-server/src/test/java/org/springframework/cloud/netflix/eureka/server/EurekaServerInitializerConfigurationTest.java

@@ -0,0 +1,58 @@
+/*
+ * Copyright 2013-2020 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.cloud.netflix.eureka.server;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.MockitoJUnitRunner;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.verify;
+
+@RunWith(MockitoJUnitRunner.class)
+public class EurekaServerInitializerConfigurationTest {
+
+	@Mock
+	private EurekaServerBootstrap eurekaServerBootstrapMock;
+
+	@InjectMocks
+	private EurekaServerInitializerConfiguration eurekaServerInitializerConfiguration;
+
+	private boolean callbackCalled;
+
+	@Before
+	public void setUp() {
+		callbackCalled = false;
+	}
+
+	@Test
+	public void testStopWithCallbackCallsStop() {
+		eurekaServerInitializerConfiguration.stop(this::setCallbackCalledTrue);
+
+		assertThat(callbackCalled).isTrue();
+		verify(eurekaServerBootstrapMock).contextDestroyed(any());
+	}
+
+	private void setCallbackCalledTrue() {
+		callbackCalled = true;
+	}
+
+}