Adds Cookie predicate test.

see gh-237

spring-cloud-gateway-core/src/test/java/org/springframework/cloud/gateway/handler/predicate/CookieRoutePredicateFactoryTests.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright 2013-2018 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.gateway.handler.predicate;
+
+import java.util.function.Predicate;
+
+import org.junit.Test;
+
+import org.springframework.cloud.gateway.handler.predicate.CookieRoutePredicateFactory.Config;
+import org.springframework.cloud.gateway.test.BaseWebClientTests;
+import org.springframework.http.HttpCookie;
+import org.springframework.mock.http.server.reactive.MockServerHttpRequest;
+import org.springframework.mock.web.server.MockServerWebExchange;
+import org.springframework.web.server.ServerWebExchange;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class CookieRoutePredicateFactoryTests extends BaseWebClientTests {
+
+	@Test
+	public void noCookiesForYou() {
+		MockServerHttpRequest request = MockServerHttpRequest.get("http://example.com")
+				.build();
+		MockServerWebExchange exchange = MockServerWebExchange.from(request);
+
+		Predicate<ServerWebExchange> predicate = new CookieRoutePredicateFactory()
+				.apply(new Config().setName("mycookie").setRegexp("ch.p"));
+
+		assertThat(predicate.test(exchange)).isFalse();
+	}
+
+	@Test
+	public void okOneCookieForYou() {
+		MockServerHttpRequest request = MockServerHttpRequest.get("http://example.com")
+				.cookie(new HttpCookie("yourcookie", "sugar"),
+						new HttpCookie("mycookie", "chip"))
+				.build();
+		MockServerWebExchange exchange = MockServerWebExchange.from(request);
+
+		Predicate<ServerWebExchange> predicate = new CookieRoutePredicateFactory()
+				.apply(new Config().setName("mycookie").setRegexp("ch.p"));
+
+		assertThat(predicate.test(exchange)).isTrue();
+	}
+
+}