red

src/main/java/application/TodoService.java

@@ -1,9 +1,13 @@
 package application;
 
+import domain.Task;
 import domain.Tasks;
 
 public class TodoService {
     public Tasks tasks() {
         return new Tasks();
     }
+
+    public void add(Task task) {
+    }
 }

src/main/java/domain/Task.java

@@ -2,8 +2,13 @@
 
 public class Task {
 
-    TaskName name;
+    private final TaskName taskName;
 
 
     Status status;
+
+    public Task(TaskName taskName) {
+
+        this.taskName = taskName;
+    }
 }

src/main/java/domain/Tasks.java

@@ -1,4 +1,8 @@
 package domain;
 
 public class Tasks {
+
+    public String asText() {
+        return "";
+    }
 }

src/test/java/application/TodoServiceTest.java

@@ -1,5 +1,7 @@
 package application;
 
+import domain.Task;
+import domain.TaskName;
 import domain.Tasks;
 import org.junit.jupiter.api.Test;
 
@@ -10,7 +12,12 @@ class TodoServiceTest {
     @Test
     void やることがとれる() {
         TodoService sut = new TodoService();
+
+        Task task = new Task(new TaskName("yarukoto"));
+        sut.add(task);
+
         Tasks actual = sut.tasks();
-        assertThat(actual).isNotNull();
+        assertThat(actual.asText())
+                .contains("yarukoto");
     }
 }