Fix LegacyCookieProcessor configuration example and test it

Closes gh-6827

spring-boot-docs/src/test/java/org/springframework/boot/context/embedded/TomcatLegacyCookieProcessorExampleTests.java

@@ -0,0 +1,64 @@
+/*
+ * Copyright 2012-2016 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.boot.context.embedded;
+
+import org.apache.catalina.Context;
+import org.apache.tomcat.util.http.LegacyCookieProcessor;
+import org.junit.Test;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.context.embedded.TomcatLegacyCookieProcessorExample.LegacyCookieProcessorConfiguration;
+import org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer;
+import org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link TomcatLegacyCookieProcessorExample}.
+ *
+ * @author Andy Wilkinson
+ */
+public class TomcatLegacyCookieProcessorExampleTests {
+
+	@Test
+	public void cookieProcessorIsCustomized() {
+		EmbeddedWebApplicationContext applicationContext = (EmbeddedWebApplicationContext) new SpringApplication(
+				TestConfiguration.class, LegacyCookieProcessorConfiguration.class).run();
+		Context context = (Context) ((TomcatEmbeddedServletContainer) applicationContext
+				.getEmbeddedServletContainer()).getTomcat().getHost().findChildren()[0];
+		assertThat(context.getCookieProcessor())
+				.isInstanceOf(LegacyCookieProcessor.class);
+	}
+
+	@Configuration
+	static class TestConfiguration {
+
+		@Bean
+		public TomcatEmbeddedServletContainerFactory tomcatFactory() {
+			return new TomcatEmbeddedServletContainerFactory(0);
+		}
+
+		@Bean
+		public EmbeddedServletContainerCustomizerBeanPostProcessor postProcessor() {
+			return new EmbeddedServletContainerCustomizerBeanPostProcessor();
+		}
+
+	}
+
+}