INT-3918: Use MockMvc instead of Sun HttpServer

JIRA: https://jira.spring.io/browse/INT-3918

https://build.spring.io/browse/INT-AT42SIO-539/

Author: artembilan

spring-integration-http/src/test/java/org/springframework/integration/http/config/HttpOutboundGatewayWithMethodExpression.java

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<beans xmlns="http://www.springframework.org/schema/beans"
+	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	   xmlns:int="http://www.springframework.org/schema/integration"
+	   xmlns:int-http="http://www.springframework.org/schema/integration/http"
+	   xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
+		http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration.xsd
+		http://www.springframework.org/schema/integration/http http://www.springframework.org/schema/integration/http/spring-integration-http.xsd">
+
+	<bean id="restTemplate" class="org.springframework.web.client.RestTemplate"/>
+
+	<int-http:outbound-gateway url="/testApps/httpMethod"
+							   request-channel="requestChannel"
+							   reply-channel="replyChannel"
+							   rest-template="restTemplate"
+							   expected-response-type="java.lang.String"
+							   http-method-expression="payload"/>
+
+	<int-http:outbound-gateway url="/testApps/httpMethod"
+							   request-channel="defaultChannel"
+							   reply-channel="replyChannel"
+							   rest-template="restTemplate"
+							   expected-response-type="java.lang.String"/>
+
+	<int:channel id="replyChannel">
+		<int:queue/>
+	</int:channel>
+
+</beans>

spring-integration-http/src/test/java/org/springframework/integration/http/config/HttpOutboundGatewayWithMethodExpressionTests-context.xml

@@ -0,0 +1,109 @@
+/*
+ * Copyright 2002-2017 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.integration.http.config;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.springframework.test.web.client.match.MockRestRequestMatchers.method;
+import static org.springframework.test.web.client.match.MockRestRequestMatchers.requestTo;
+import static org.springframework.test.web.client.response.MockRestResponseCreators.withSuccess;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.parsing.BeanDefinitionParsingException;
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+import org.springframework.http.HttpMethod;
+import org.springframework.http.MediaType;
+import org.springframework.messaging.Message;
+import org.springframework.messaging.MessageChannel;
+import org.springframework.messaging.PollableChannel;
+import org.springframework.messaging.support.GenericMessage;
+import org.springframework.test.annotation.DirtiesContext;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.test.web.client.MockRestServiceServer;
+import org.springframework.web.client.RestTemplate;
+
+/**
+ * @author Oleg Zhurakousky
+ * @author Artem Bilan
+ *
+ * see https://jira.springsource.org/browse/INT-2397
+ */
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration
+@DirtiesContext
+public class HttpOutboundGatewayWithMethodExpressionTests {
+
+	@Autowired
+	private MessageChannel defaultChannel;
+
+	@Autowired
+	private MessageChannel requestChannel;
+
+	@Autowired
+	private PollableChannel replyChannel;
+
+	@Autowired
+	private RestTemplate restTemplate;
+
+	private MockRestServiceServer mockServer;
+
+	@Before
+	public void setup() {
+		this.mockServer = MockRestServiceServer.createServer(this.restTemplate);
+	}
+
+	@Test
+	public void testDefaultMethod() throws Exception {
+		this.mockServer.expect(requestTo("/testApps/httpMethod"))
+				.andExpect(method(HttpMethod.POST))
+				.andRespond(withSuccess(HttpMethod.POST.name(), MediaType.TEXT_PLAIN));
+
+		this.defaultChannel.send(new GenericMessage<String>("Hello"));
+		Message<?> message = this.replyChannel.receive(5000);
+		assertNotNull(message);
+		assertEquals("POST", message.getPayload());
+
+		this.mockServer.verify();
+	}
+
+	@Test
+	public void testExplicitlySetMethod() throws Exception {
+		this.mockServer.expect(requestTo("/testApps/httpMethod"))
+				.andExpect(method(HttpMethod.GET))
+				.andRespond(withSuccess(HttpMethod.GET.name(), MediaType.TEXT_PLAIN));
+
+		this.requestChannel.send(new GenericMessage<String>("GET"));
+		Message<?> message = replyChannel.receive(5000);
+		assertNotNull(message);
+		assertEquals("GET", message.getPayload());
+
+		this.mockServer.verify();
+	}
+
+	@Test(expected = BeanDefinitionParsingException.class)
+	public void testMutuallyExclusivityInMethodAndMethodExpression() throws Exception {
+		new ClassPathXmlApplicationContext(
+				"http-outbound-gateway-with-httpmethod-expression-fail.xml", getClass())
+				.close();
+	}
+
+}