의존성 주입

eatgo-api/src/main/java/com/example/eatgo/domain/RestaurantRepository.java

@@ -1,24 +1,9 @@
 package com.example.eatgo.domain;
 
-import org.springframework.stereotype.Repository;
-
-import java.util.ArrayList;
 import java.util.List;
 
-public class RestaurantRepository {
+public interface RestaurantRepository {
+    List<Restaurant> findAll();
 
-    private List<Restaurant> restaurantList = new ArrayList<>();
-
-    public RestaurantRepository() {
-        restaurantList.add(new Restaurant(1004L, "Bob zip", "Seoul"));
-        restaurantList.add(new Restaurant(2020L, "Cyber Food", "Seoul"));
-    }
-
-    public List<Restaurant> findAll() {
-        return restaurantList;
-    }
-
-    public Restaurant findById(Long id) {
-        return restaurantList.stream().filter(v -> v.getId().equals(id)).findFirst().orElse(null) ;
-    }
+    Restaurant findById(Long id);
 }

eatgo-api/src/main/java/com/example/eatgo/domain/RestaurantRepositoryImpl.java

@@ -0,0 +1,27 @@
+package com.example.eatgo.domain;
+
+import org.springframework.stereotype.Repository;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Repository
+public class RestaurantRepositoryImpl implements RestaurantRepository {
+
+    private List<Restaurant> restaurantList = new ArrayList<>();
+
+    public RestaurantRepositoryImpl() {
+        restaurantList.add(new Restaurant(1004L, "Bob zip", "Seoul"));
+        restaurantList.add(new Restaurant(2020L, "Cyber Food", "Seoul"));
+    }
+
+    @Override
+    public List<Restaurant> findAll() {
+        return restaurantList;
+    }
+
+    @Override
+    public Restaurant findById(Long id) {
+        return restaurantList.stream().filter(v -> v.getId().equals(id)).findFirst().orElse(null) ;
+    }
+}

eatgo-api/src/main/java/com/example/eatgo/interfaces/RestaurantController.java

@@ -2,18 +2,19 @@ package com.example.eatgo.interfaces;
 
 import com.example.eatgo.domain.Restaurant;
 import com.example.eatgo.domain.RestaurantRepository;
+import com.example.eatgo.domain.RestaurantRepositoryImpl;
+import lombok.RequiredArgsConstructor;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.RestController;
 
-import java.util.ArrayList;
 import java.util.List;
-import java.util.Scanner;
 
 @RestController
+@RequiredArgsConstructor
 public class RestaurantController {
 
-    private final RestaurantRepository repository = new RestaurantRepository();
+    private final RestaurantRepository repository;
 
     @GetMapping("/restaurants")
     public List<Restaurant> list() {

eatgo-api/src/test/java/com/example/eatgo/interfaces/RestaurantControllerTest.java

@@ -1,10 +1,13 @@
 package com.example.eatgo.interfaces;
 
+import com.example.eatgo.domain.RestaurantRepository;
+import com.example.eatgo.domain.RestaurantRepositoryImpl;
 import org.hamcrest.core.StringContains;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
+import org.springframework.boot.test.mock.mockito.SpyBean;
 import org.springframework.test.context.junit.jupiter.SpringExtension;
 import org.springframework.test.web.servlet.MockMvc;
 
@@ -16,9 +19,12 @@ import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.
 @WebMvcTest(RestaurantController.class)
 class RestaurantControllerTest {
 
-    @Autowired
+    @ Autowired
     private MockMvc mvc;
 
+    @SpyBean(RestaurantRepositoryImpl.class)
+    private RestaurantRepository restaurantRepository;
+
     @Test
     public void list() throws Exception {
         mvc.perform(get("/restaurants"))