Add Validation for Email Format

src/main/java/com/mangkyu/employment/interview/app/user/dto/AddUserRequest.java

@@ -7,6 +7,7 @@ import lombok.NoArgsConstructor;
 import lombok.RequiredArgsConstructor;
 import org.hibernate.validator.constraints.Range;
 
+import javax.validation.constraints.Email;
 import javax.validation.constraints.NotBlank;
 import javax.validation.constraints.NotNull;
 
@@ -18,6 +19,7 @@ import static com.mangkyu.employment.interview.app.quiz.constants.QuizConstants.
 @NoArgsConstructor(force = true)
 public class AddUserRequest {
 
+    @Email
     @NotBlank
     private final String email;
 

src/test/java/com/mangkyu/employment/interview/app/user/controller/UserControllerTest.java

@@ -53,6 +53,25 @@ class UserControllerTest {
         result.andExpect(status().isBadRequest());
     }
 
+    @Test
+    public void addUserFail_NotEmailFormat() throws Exception {
+        // given
+        final AddUserRequest addUserRequest = AddUserRequest.builder()
+                .email("asdas")
+                .quizLevel(QuizLevel.JUNIOR)
+                .build();
+
+        // when
+        final ResultActions result = mockMvc.perform(
+                MockMvcRequestBuilders.post("/user")
+                        .content(new Gson().toJson(addUserRequest))
+                        .contentType(MediaType.APPLICATION_JSON)
+        );
+
+        // then
+        result.andExpect(status().isBadRequest());
+    }
+
     @Test
     public void addUserFail_QuizLevelIsNull() throws Exception {
         // given