GH-804: EmbedKafkaCtxCustom add hashCode & equals

Resolves https://github.com/spring-projects/spring-kafka/issues/804

GH-804: `hashCode()` and `equals() for `EmbeddedKafkaContextCustomizer`

* Fix check style.

* Code review changes

spring-kafka-test/src/main/java/org/springframework/kafka/test/context/EmbeddedKafkaContextCustomizer.java

@@ -40,6 +40,7 @@ import org.springframework.util.StringUtils;
  * @author Artem Bilan
  * @author Elliot Metsger
  * @author Zach Olauson
+ * @author Oleg Artyomov
  *
  * @since 1.3
  */
@@ -107,5 +108,19 @@ class EmbeddedKafkaContextCustomizer implements ContextCustomizer {
 		((DefaultSingletonBeanRegistry) beanFactory).registerDisposableBean(EmbeddedKafkaBroker.BEAN_NAME, embeddedKafka);
 	}
 
+	@Override
+	public int hashCode() {
+		return this.embeddedKafka.hashCode();
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if (obj == null || obj.getClass() != getClass()) {
+			return false;
+		}
+		EmbeddedKafkaContextCustomizer customizer = (EmbeddedKafkaContextCustomizer) obj;
+		return this.embeddedKafka.equals(customizer.embeddedKafka);
+	}
+
 }
 

spring-kafka-test/src/test/java/org/springframework/kafka/test/context/EmbeddedKafkaContextCustomizerTests.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright 2017 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
+ *
+ *      http://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.kafka.test.context;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import org.springframework.core.annotation.AnnotationUtils;
+
+
+
+/**
+ * @author Oleg Artyomov
+ * @since 1.3
+ */
+
+public class EmbeddedKafkaContextCustomizerTests {
+
+	private EmbeddedKafka annotationFromFirstClass;
+	private EmbeddedKafka annotationFromSecondClass;
+
+
+	@Before
+	public void beforeEachTest() {
+		annotationFromFirstClass = AnnotationUtils.findAnnotation(TestWithEmbeddedKafka.class, EmbeddedKafka.class);
+		annotationFromSecondClass = AnnotationUtils.findAnnotation(SecondTestWithEmbeddedKafka.class, EmbeddedKafka.class);
+	}
+
+
+	@Test
+	public void testHashCode() {
+		assertThat(new EmbeddedKafkaContextCustomizer(annotationFromFirstClass).hashCode()).isNotEqualTo(0);
+		assertThat(new EmbeddedKafkaContextCustomizer(annotationFromFirstClass).hashCode()).isEqualTo(new EmbeddedKafkaContextCustomizer(annotationFromSecondClass).hashCode());
+	}
+
+
+	@Test
+	public void testEquals() {
+		assertThat(new EmbeddedKafkaContextCustomizer(annotationFromFirstClass)).isEqualTo(new EmbeddedKafkaContextCustomizer(annotationFromSecondClass));
+		assertThat(new EmbeddedKafkaContextCustomizer(annotationFromFirstClass)).isNotEqualTo(new Object());
+	}
+
+
+	@EmbeddedKafka
+	private class TestWithEmbeddedKafka {
+
+	}
+
+	@EmbeddedKafka
+	private class SecondTestWithEmbeddedKafka {
+
+	}
+
+}