done

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

@@ -10,5 +10,5 @@ public class HelloController {
     public String index() {
         return "Greetings from Spring Boot!";
     }
-    
-}
+
+}

initial/app.groovy

@@ -0,0 +1,14 @@
+package hello
+
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RestController
+
+@RestController
+class ThisWillActuallyRun {
+
+    @RequestMapping("/")
+    String home() {
+        return "Hello World!"
+    }
+
+}

initial/pom.xml

@@ -12,12 +12,50 @@
         <artifactId>spring-boot-starter-parent</artifactId>
         <version>2.0.3.RELEASE</version>
     </parent>
-
     <dependencies>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-actuator</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>hamcrest-library</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-test</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-test</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-test</artifactId>
+            <version>RELEASE</version>
+            <scope>compile</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-test-autoconfigure</artifactId>
+        </dependency>
     </dependencies>
 
     <properties>

initial/src/main/java/hello/Application.java

@@ -2,23 +2,32 @@ package hello;
 
 import java.util.Arrays;
 
+import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.Bean;
 
 @SpringBootApplication
 public class Application {
-    
+
     public static void main(String[] args) {
-        ApplicationContext ctx = SpringApplication.run(Application.class, args);
-        
-        System.out.println("Let's inspect the beans provided by Spring Boot:");
-        
-        String[] beanNames = ctx.getBeanDefinitionNames();
-        Arrays.sort(beanNames);
-        for (String beanName : beanNames) {
-            System.out.println(beanName);
-        }
+        SpringApplication.run(Application.class, args);
+    }
+
+    @Bean
+    public CommandLineRunner commandLineRunner(ApplicationContext ctx) {
+        return args -> {
+
+            System.out.println("Let's inspect the beans provided by Spring Boot:");
+
+            String[] beanNames = ctx.getBeanDefinitionNames();
+            Arrays.sort(beanNames);
+            for (String beanName : beanNames) {
+                System.out.println(beanName);
+            }
+
+        };
     }
 
-}
+}

initial/src/main/java/hello/HelloController.java

@@ -5,10 +5,10 @@ import org.springframework.web.bind.annotation.RequestMapping;
 
 @RestController
 public class HelloController {
-    
+
     @RequestMapping("/")
     public String index() {
         return "Greetings from Spring Boot!";
     }
-    
-}
+
+}

initial/src/main/java/hello/HelloControllerIT.java

@@ -0,0 +1,41 @@
+package hello;
+
+import static org.hamcrest.Matchers.*;
+import static org.junit.Assert.*;
+
+import java.net.URL;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.boot.web.server.LocalServerPort;
+import org.springframework.http.ResponseEntity;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+public class HelloControllerIT {
+
+    @LocalServerPort
+    private int port;
+
+    private URL base;
+
+    @Autowired
+    private TestRestTemplate template;
+
+    @Before
+    public void setUp() throws Exception {
+        this.base = new URL("http://localhost:" + port + "/");
+    }
+
+    @Test
+    public void getHello() throws Exception {
+        ResponseEntity<String> response = template.getForEntity(base.toString(),
+                String.class);
+        assertThat(response.getBody(), equalTo("Greetings from Spring Boot!"));
+    }
+}

initial/src/main/java/hello/HelloControllerTest.java

@@ -0,0 +1,31 @@
+package hello;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.http.MediaType;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+@AutoConfigureMockMvc
+public class HelloControllerTest {
+
+    @Autowired
+    private MockMvc mvc;
+
+    @Test
+    public void getHello() throws Exception {
+        mvc.perform(MockMvcRequestBuilders.get("/").accept(MediaType.APPLICATION_JSON))
+                .andExpect(status().isOk())
+                .andExpect(content().string(equalTo("Greetings from Spring Boot!")));
+    }
+}