Add test for producer key and payload cast

spring-integration-kafka/src/test/java/org/springframework/integration/kafka/outbound/ProducerTest.java

@@ -0,0 +1,60 @@
+/*
+ * Copyright 2015 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.integration.kafka.outbound;
+
+import org.apache.kafka.clients.producer.Producer;
+import org.apache.kafka.common.serialization.Serializer;
+import org.junit.Test;
+import org.mockito.Mockito;
+
+import org.springframework.core.convert.ConversionService;
+import org.springframework.integration.kafka.support.ProducerConfiguration;
+import org.springframework.integration.kafka.support.ProducerMetadata;
+
+/**
+ * @author Marius Bogoevici
+ */
+public class ProducerTest {
+
+	@Test
+	@SuppressWarnings({"unchecked","rawtypes"})
+	public void producerContextDataConversionTest() {
+		Producer<FooBase,BarBase> producer = (Producer<FooBase, BarBase>) Mockito.mock(Producer.class);
+		Serializer serializer = Mockito.mock(Serializer.class);
+		ProducerMetadata<FooBase,BarBase> producerMetadata =
+				new ProducerMetadata<>("topic", FooBase.class, BarBase.class, serializer,serializer);
+		ProducerConfiguration<FooBase,BarBase> producerConfiguration =
+				new ProducerConfiguration<>(producerMetadata,producer);
+		ConversionService conversionService = Mockito.mock(ConversionService.class);
+		producerConfiguration.setConversionService(conversionService);
+		producerConfiguration.convertAndSend("topic",0,new Foo(), new Bar());
+		// the key and payload can be cast automatically, no conversion is necessary
+		Mockito.verifyZeroInteractions(conversionService);
+	}
+
+	public static class FooBase {
+	}
+
+	public static class Foo extends FooBase {
+	}
+
+	public static class BarBase {
+	}
+
+	public static class Bar extends BarBase {
+	}
+}