Added a basic controller unit test and integration test

Fixes gh-18

complete/build.gradle

     // tag::actuator[]
     compile("org.springframework.boot:spring-boot-starter-actuator")
     // end::actuator[]
-    testCompile("junit:junit")
+    testCompile("org.springframework.boot:spring-boot-starter-test")
 }
 
 task wrapper(type: Wrapper) {

complete/pom.xml

             <artifactId>spring-boot-starter-actuator</artifactId>
         </dependency>
         <!-- end::actuator[] -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <start-class>hello.Application</start-class>
     </properties>
 
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
             </plugin>
+            <plugin>
+                <artifactId>maven-failsafe-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>integration-test</goal>
+                            <goal>verify</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>
 

complete/src/main/java/hello/HelloController.java

 @RestController
 public class HelloController {
     
-    @RequestMapping("/")
+    @RequestMapping("/hello")
     public String index() {
         return "Greetings from Spring Boot!";
     }

complete/src/test/java/hello/HelloControllerIT.java

+package hello;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.test.IntegrationTest;
+import org.springframework.boot.test.SpringApplicationConfiguration;
+import org.springframework.boot.test.TestRestTemplate;
+import org.springframework.http.ResponseEntity;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.test.context.web.WebAppConfiguration;
+import org.springframework.web.client.RestTemplate;
+
+import java.net.URL;
+
+import static org.hamcrest.Matchers.is;
+import static org.junit.Assert.assertThat;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@SpringApplicationConfiguration(classes = Application.class)
+@WebAppConfiguration
+@IntegrationTest({"server.port=9090"})
+public class HelloControllerIT {
+	private URL base;
+	private RestTemplate template;
+
+	@Before
+	public void setUp() throws Exception {
+		this.base = new URL("http://localhost:9090/hello");
+		template = new TestRestTemplate();
+	}
+
+	@Test
+	public void getHello() throws Exception {
+		ResponseEntity<String> response = template.getForEntity(base.toString(), String.class);
+		assertThat(response.getBody(), is("Greetings from Spring Boot!"));
+	}
+}

complete/src/test/java/hello/HelloControllerTest.java

+package hello;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.test.SpringApplicationConfiguration;
+import org.springframework.http.MediaType;
+import org.springframework.mock.web.MockServletContext;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.test.context.web.WebAppConfiguration;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
+import org.springframework.test.web.servlet.setup.MockMvcBuilders;
+
+import static org.hamcrest.Matchers.is;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@SpringApplicationConfiguration(classes = Application.class)
+@ContextConfiguration(classes = MockServletContext.class)
+@WebAppConfiguration
+public class HelloControllerTest {
+	private MockMvc mvc;
+
+	@Before
+	public void setUp() throws Exception {
+		mvc = MockMvcBuilders.standaloneSetup(new HelloController()).build();
+	}
+
+	@Test
+	public void getHello() throws Exception {
+		mvc.perform(MockMvcRequestBuilders.get("/hello").accept(MediaType.APPLICATION_JSON))
+				.andExpect(status().isOk())
+				.andExpect(content().string(is("Greetings from Spring Boot!")));
+	}
+}