지하철 등록 techeer-sv#1 feat : 새로운 역 등록 기능 구현 및 예외 처리

src/main/java/subway/SubwayService.java

@@ -8,7 +8,8 @@
 public class SubwayService {
 
     public void addStation(String name) {
-        StationRepository.addStation(new Station(name));
+        Station station = new Station(name);
+        StationRepository.addStation(station);
     }
 
     public void addLine(String name, String[] stationNames) {

src/main/java/subway/domain/Station.java

@@ -1,9 +1,12 @@
 package subway.domain;
 
 public class Station {
-    private String name;
+    private final String name;
 
     public Station(String name) {
+        if(name == null || name.length() < 2) {
+            throw new IllegalArgumentException("[ERROR] 역 이름은 2글자 이상이어야 합니다.");
+        }
         this.name = name;
     }
 

src/main/java/subway/domain/StationRepository.java

@@ -13,10 +13,17 @@ public static List<Station> stations() {
     }
 
     public static void addStation(Station station) {
+        if(stations.stream().anyMatch(s -> s.getName().equals(station.getName()))){
+            throw new IllegalArgumentException("[ERROR] 중복된 역 이름입니다.");
+        }
         stations.add(station);
     }
 
     public static boolean deleteStation(String name) {
         return stations.removeIf(station -> Objects.equals(station.getName(), name));
     }
+
+    public static boolean isStationExist(String name) {
+        return stations.stream().anyMatch(station -> station.getName().equals(name));
+    }
 }

src/test/java/subway/SubwayServiceTest.java

@@ -1,5 +1,45 @@
 package subway;
 
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+import subway.domain.LineRepository;
+import subway.domain.StationRepository;
+
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
 public class SubwayServiceTest {
+    SubwayService subwayService;
+
+    @BeforeEach
+    void setUp() {
+        subwayService = new SubwayService();
+    }
+
+    @Nested
+    @DisplayName("역 등록 테스트")
+    class AddStationTest {
+
+        @Test
+        @DisplayName("새로운 역을 등록")
+        void addStation() {
+            subwayService.addStation("잠실역");
+            assertTrue(StationRepository.isStationExist("잠실역"));
+        }
+
+        @Test
+        @DisplayName("중복된 역 검증")
+        void duplicationStation() {
+            subwayService.addStation("잠실역");
+            assertThrows(IllegalArgumentException.class, () -> subwayService.addStation("잠실역"));
+        }
 
+        @Test
+        @DisplayName("역 이름은 2글자 이상이어야 한다.")
+        void invalidStationName() {
+            assertThrows(IllegalArgumentException.class, () -> subwayService.addStation("짱"));
+        }
+    }
 }