feat(task_1): create the "Greeting" feature

src/main/java/lv/ctco/springboottemplate/features/greeting/GreetingController.java

@@ -0,0 +1,22 @@
+package lv.ctco.springboottemplate.features.greeting;
+
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+@RequestMapping("/api/greeting")
+@Tag(name = "Greeting Controller", description = "Greeting endpoint")
+public class GreetingController {
+  private final GreetingService greetingService;
+
+  public GreetingController(GreetingService greetingService) {
+    this.greetingService = greetingService;
+  }
+
+  @GetMapping
+  @Operation(summary = "Get greeting message")
+  public String getAllTodos() {
+    return greetingService.greet();
+  }
+}

src/main/java/lv/ctco/springboottemplate/features/greeting/GreetingService.java

@@ -0,0 +1,20 @@
+package lv.ctco.springboottemplate.features.greeting;
+
+import lv.ctco.springboottemplate.features.todo.TodoService;
+import org.springframework.stereotype.Service;
+
+@Service
+public class GreetingService {
+  private final TodoService todoService;
+
+  public GreetingService(TodoService todoService) {
+    this.todoService = todoService;
+  }
+
+  public String greet() {
+    long openTasksCount =
+        this.todoService.getAllTodos().stream().filter(task -> !task.completed()).count();
+
+    return String.format("Hello from Spring! You have %d open tasks.", openTasksCount);
+  }
+}

src/test/java/lv/ctco/springboottemplate/features/greeting/GreetingServiceIntegrationTest.java

@@ -1,9 +1,20 @@
 package lv.ctco.springboottemplate.features.greeting;
 
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.List;
+import lv.ctco.springboottemplate.features.todo.Todo;
+import lv.ctco.springboottemplate.features.todo.TodoRepository;
 import lv.ctco.springboottemplate.features.todo.TodoService;
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
 import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.DynamicPropertyRegistry;
+import org.springframework.test.context.DynamicPropertySource;
 import org.springframework.test.context.TestConstructor;
+import org.testcontainers.containers.MongoDBContainer;
+import org.testcontainers.junit.jupiter.Container;
 import org.testcontainers.junit.jupiter.Testcontainers;
 
 /**
@@ -15,13 +26,10 @@
  * <p>Initially marked {@link Disabled} to be enabled by the developer after implementation.
  */
 @SpringBootTest
-@Disabled("Enable after implementing GreetingService using TodoService")
 @Testcontainers
 @TestConstructor(autowireMode = TestConstructor.AutowireMode.ALL)
 class GreetingServiceIntegrationTest {
 
-  /*
-
   @Container static MongoDBContainer mongoDBContainer = new MongoDBContainer("mongo:6.0.8");
 
   @DynamicPropertySource
@@ -94,5 +102,4 @@ void should_ignore_null_todos_or_null_completed_flags() {
     // then
     assertThat(message).contains("1 open task");
   }
-  */
 }