GH-804: EmbedKafkaCtxCustom add hashCode & equals

Resolves #804

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

* Fix check style.

* Code review changes

(cherry picked from commit 95d442a)

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

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

Author: OArtyomov

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

@@ -35,6 +35,7 @@
  * Registers {@link KafkaEmbedded} bean.
  *
  * @author Artem Bilan
+ * @author Oleg Artyomov
  *
  * @since 1.3
  */
@@ -78,5 +79,19 @@ public void customizeContext(ConfigurableApplicationContext context, MergedConte
 		((DefaultSingletonBeanRegistry) beanFactory).registerDisposableBean(KafkaEmbedded.BEAN_NAME, kafkaEmbedded);
 	}
 
+	@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 {
+
+	}
+
+}