Add basic Cucmber test feature

build.gradle

@@ -14,6 +14,10 @@ repositories {
 dependencies {
     implementation 'org.springframework.boot:spring-boot-starter-web'
     testImplementation('org.springframework.boot:spring-boot-starter-test')
+    testImplementation 'io.cucumber:cucumber-java:7.14.0'
+    testImplementation 'io.cucumber:cucumber-junit:7.14.0'
+    testImplementation 'io.cucumber:cucumber-spring:7.14.0'
+    testImplementation 'org.junit.vintage:junit-vintage-engine:5.10.3'
 }
 
 test {

src/main/java/com/wilkins/showcase/ShowcaseApplication.java

@@ -5,7 +5,6 @@
 
 @SpringBootApplication
 public class ShowcaseApplication {
-
     public static void main(String[] args) {
         SpringApplication.run(ShowcaseApplication.class, args);
     }

src/test/java/com/wilkins/showcase/CucumberIntegrationTest.java

@@ -0,0 +1,10 @@
+package com.wilkins.showcase;
+
+import io.cucumber.junit.Cucumber;
+import io.cucumber.junit.CucumberOptions;
+import org.junit.runner.RunWith;
+
+@RunWith(Cucumber.class)
+@CucumberOptions(features = "src/test/resources")
+public class CucumberIntegrationTest {
+}

src/test/java/com/wilkins/showcase/GreetingStepDefs.java

@@ -0,0 +1,27 @@
+package com.wilkins.showcase;
+
+import io.cucumber.java.en.Then;
+import io.cucumber.java.en.When;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class GreetingStepDefs extends SpringIntegrationStepDefs {
+
+    JsonGreeting greeting;
+
+    @When("api call to {string}")
+    public void apiCallToGreeting(String path) {
+        greeting = getRestTemplate().getForObject(getBaseUrl() + path, JsonGreeting.class);
+    }
+
+    @Then("{string} greeting is returned")
+    public void greetingIsReturned(String greetingMessage) {
+        assertThat(greeting.message()).isEqualTo(greetingMessage);
+    }
+
+    private record JsonGreeting(String salutation, String name) {
+        String message() {
+            return salutation + " " + name;
+        }
+    }
+}

src/test/java/com/wilkins/showcase/SpringIntegrationStepDefs.java

@@ -0,0 +1,25 @@
+package com.wilkins.showcase;
+
+import io.cucumber.spring.CucumberContextConfiguration;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.web.server.LocalServerPort;
+import org.springframework.boot.web.client.RestTemplateBuilder;
+import org.springframework.web.client.RestTemplate;
+
+@CucumberContextConfiguration
+@SpringBootTest(classes = ShowcaseApplication.class, webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+public class SpringIntegrationStepDefs {
+    @LocalServerPort
+    int port;
+    @Autowired
+    RestTemplateBuilder restTemplateBuilder;
+
+    protected String getBaseUrl() {
+        return "http://localhost:" + port;
+    }
+
+    protected RestTemplate getRestTemplate() {
+        return restTemplateBuilder.build();
+    }
+}

src/test/java/com/wilkins/showcase/controller/GreetingApplicationTest.java

@@ -0,0 +1,27 @@
+package com.wilkins.showcase.controller;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.web.server.LocalServerPort;
+import org.springframework.boot.web.client.RestTemplateBuilder;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+public class GreetingApplicationTest {
+
+    @Autowired
+    RestTemplateBuilder restTemplateBuilder;
+
+    @LocalServerPort
+    int port;
+
+    @Test
+    void canGetGreeting() {
+        var restTemplate = restTemplateBuilder.build();
+        var url = "http://localhost:%s/greetings".formatted(port);
+        var greeting = restTemplate.getForObject(url, String.class);
+        assertNotNull(greeting);
+    }
+}

src/test/resources/Greeting.feature

@@ -0,0 +1,9 @@
+Feature: Greeting can be retrieved
+
+  Scenario: Default greeting returned
+    When api call to "/greetings"
+    Then "hello world" greeting is returned
+
+  Scenario: Special greeting returned
+    When api call to "/greetings?salutation=Morning&name=Robin"
+    Then "Morning Robin" greeting is returned