Update test of setContentLengthLong to include param.

Otherwise useServlet31 was always returning false.

fixes gh-2196

spring-cloud-netflix-core/src/main/java/org/springframework/cloud/netflix/zuul/filters/post/SendResponseFilter.java

@@ -73,12 +73,17 @@ public class SendResponseFilter extends ZuulFilter {
 		super();
 		// To support Servlet API 3.1 we need to check if setContentLengthLong exists
 		try {
-			HttpServletResponse.class.getMethod("setContentLengthLong");
+			//TODO: remove in 2.0
+			HttpServletResponse.class.getMethod("setContentLengthLong", long.class);
 		} catch(NoSuchMethodException e) {
 			useServlet31 = false;
 		}
 	}
 
+	/* for testing */ boolean isUseServlet31() {
+		return useServlet31;
+	}
+
 	private ThreadLocal<byte[]> buffers = new ThreadLocal<byte[]>() {
 		@Override
 		protected byte[] initialValue() {

spring-cloud-netflix-core/src/main/java/org/springframework/cloud/netflix/zuul/filters/route/RibbonRoutingFilter.java

@@ -70,6 +70,7 @@ public class RibbonRoutingFilter extends ZuulFilter {
 		this.requestCustomizers = requestCustomizers;
 		// To support Servlet API 3.1 we need to check if getContentLengthLong exists
 		try {
+			//TODO: remove in 2.0
 			HttpServletRequest.class.getMethod("getContentLengthLong");
 		} catch(NoSuchMethodException e) {
 			useServlet31 = false;
@@ -80,6 +81,10 @@ public class RibbonRoutingFilter extends ZuulFilter {
 		this(new ProxyRequestHelper(), ribbonCommandFactory, null);
 	}
 
+	/* for testing */ boolean isUseServlet31() {
+		return useServlet31;
+	}
+
 	@Override
 	public String filterType() {
 		return ROUTE_TYPE;

spring-cloud-netflix-core/src/test/java/org/springframework/cloud/netflix/zuul/filters/post/SendResponseFilterTests.java

@@ -39,6 +39,7 @@ import com.netflix.zuul.constants.ZuulConstants;
 import com.netflix.zuul.context.Debug;
 import com.netflix.zuul.context.RequestContext;
 
+import static org.assertj.core.api.Assertions.assertThat;
 import static org.hamcrest.CoreMatchers.is;
 import static org.hamcrest.Matchers.equalTo;
 import static org.junit.Assert.assertThat;
@@ -74,6 +75,11 @@ public class SendResponseFilterTests {
 		runFilter(characterEncoding, content, false);
 	}
 
+	@Test
+	public void useServlet31Works() {
+		assertThat(new SendResponseFilter().isUseServlet31()).isTrue();
+	}
+
 	@Test
 	public void characterEncodingNotOverridden() throws Exception {
 		String characterEncoding = "UTF-16";

spring-cloud-netflix-core/src/test/java/org/springframework/cloud/netflix/zuul/filters/route/RibbonRoutingFilterTests.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2013-2017 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.cloud.netflix.zuul.filters.route;
+
+import java.util.Collections;
+
+import org.junit.Test;
+import org.springframework.cloud.netflix.ribbon.support.RibbonRequestCustomizer;
+import org.springframework.cloud.netflix.zuul.filters.ProxyRequestHelper;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.mock;
+
+/**
+ * @author Spencer Gibb
+ */
+public class RibbonRoutingFilterTests {
+	@Test
+	public void useServlet31Works() {
+		RibbonCommandFactory factory = mock(RibbonCommandFactory.class);
+		RibbonRoutingFilter filter = new RibbonRoutingFilter(new ProxyRequestHelper(), factory,
+				Collections.<RibbonRequestCustomizer>emptyList());
+		assertThat(filter.isUseServlet31()).isTrue();
+	}
+}