"sharedHttpSession" shortcut for MockMvc builders

Issue: SPR-13820

spring-test/src/test/java/org/springframework/test/web/servlet/setup/SharedHttpSessionTests.java

@@ -0,0 +1,108 @@
+/*
+ * 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.test.web.servlet.setup;
+
+import javax.servlet.http.HttpSession;
+
+import org.junit.Test;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.MvcResult;
+import org.springframework.web.bind.annotation.GetMapping;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+import static org.springframework.test.web.servlet.setup.SharedHttpSessionConfigurer.sharedHttpSession;
+
+/**
+ * Tests for {@link SharedHttpSessionConfigurer}.
+ * @author Rossen Stoyanchev
+ */
+public class SharedHttpSessionTests {
+
+
+	@Test
+	public void httpSession() throws Exception {
+
+		MockMvc mockMvc = MockMvcBuilders.standaloneSetup(new TestController())
+				.apply(sharedHttpSession())
+				.build();
+
+		String url = "/session";
+
+		MvcResult result = mockMvc.perform(get(url)).andExpect(status().isOk()).andReturn();
+		HttpSession session = result.getRequest().getSession(false);
+		assertNotNull(session);
+		assertEquals(1, session.getAttribute("counter"));
+
+		result = mockMvc.perform(get(url)).andExpect(status().isOk()).andReturn();
+		session = result.getRequest().getSession(false);
+		assertNotNull(session);
+		assertEquals(2, session.getAttribute("counter"));
+
+		result = mockMvc.perform(get(url)).andExpect(status().isOk()).andReturn();
+		session = result.getRequest().getSession(false);
+		assertNotNull(session);
+		assertEquals(3, session.getAttribute("counter"));
+	}
+
+	@Test
+	public void noHttpSession() throws Exception {
+
+		MockMvc mockMvc = MockMvcBuilders.standaloneSetup(new TestController())
+				.apply(sharedHttpSession())
+				.build();
+
+		String url = "/no-session";
+
+		MvcResult result = mockMvc.perform(get(url)).andExpect(status().isOk()).andReturn();
+		HttpSession session = result.getRequest().getSession(false);
+		assertNull(session);
+
+		result = mockMvc.perform(get(url)).andExpect(status().isOk()).andReturn();
+		session = result.getRequest().getSession(false);
+		assertNull(session);
+
+		url = "/session";
+
+		result = mockMvc.perform(get(url)).andExpect(status().isOk()).andReturn();
+		session = result.getRequest().getSession(false);
+		assertNotNull(session);
+		assertEquals(1, session.getAttribute("counter"));
+	}
+
+
+	@Controller
+	private static class TestController {
+
+		@GetMapping("/session")
+		public String handle(HttpSession session) {
+			Integer counter = (Integer) session.getAttribute("counter");
+			session.setAttribute("counter", (counter != null ? counter + 1 : 1));
+			return "view";
+		}
+
+		@GetMapping("/no-session")
+		public String handle() {
+			return "view";
+		}
+	}
+
+}