feat(postUser): create an endpoint for creating a new user (#28)

* feat(postUser): create an endpoint for creating a new user

* feat(postUser): correction du rebase

---------

Co-authored-by: Romain Vanhee <romain.vanhee@yrycom.com>

Author: profotoce59

README.md

@@ -257,6 +257,7 @@ Update an existing user's information.
 ```http
 PUT /random-users/1
 Content-Type: application/json
+PUT /random-users/{id}
 ```
 
 **Request Body:**
@@ -272,6 +273,24 @@ Content-Type: application/json
   "nat": "FR"
 }
 ```
+#### Create a new user
+```http
+POST /random-users
+```
+Example body:
+
+```json
+{
+  "gender": "female",
+  "firstname": "Albert",
+  "lastname": "Bing",
+  "civility": "Mrs",
+  "email": "albert.bing@example.com",
+  "phone": "123456789",
+  "picture": "pic.jpg",
+  "nat": "FR"
+}
+```
 
 **Responses:**
 - `200 OK` - User updated successfully
@@ -567,7 +586,7 @@ This project integrates with **Random User Generator API**:
 - [x] [Add this endpoint get /user/{id}](https://github.com/XPEHO/spring_boot_java_random_user/issues/8)
 - [x] [Add this endpoint put /user/{id}](https://github.com/XPEHO/spring_boot_java_random_user/issues/9)
 - [ ] [Add this endpoint delete /user/{id}](https://github.com/XPEHO/spring_boot_java_random_user/issues/10)
-- [ ] [Add this endpoint post /user](https://github.com/XPEHO/spring_boot_java_random_user/issues/11)
+- [x] [Add this endpoint post /user](https://github.com/XPEHO/spring_boot_java_random_user/issues/11)
 
 ---
 

src/main/java/com/xpeho/spring_boot_java_random_user/domain/usecases/CreateUserUseCase.java

@@ -0,0 +1,31 @@
+package com.xpeho.spring_boot_java_random_user.domain.usecases;
+
+import com.xpeho.spring_boot_java_random_user.domain.entities.UserEntity;
+import com.xpeho.spring_boot_java_random_user.domain.entities.UserRequest;
+import com.xpeho.spring_boot_java_random_user.domain.services.UserService;
+import org.springframework.stereotype.Service;
+
+@Service
+public class CreateUserUseCase {
+    private final UserService userService;
+
+    public CreateUserUseCase(UserService userService) {
+        this.userService = userService;
+    }
+
+    public UserEntity execute(UserRequest user) {
+        UserEntity userToCreate = new UserEntity(
+        null,
+            user.gender(),
+            user.firstname(),
+            user.lastname(),
+            user.civility(),
+            user.email(),
+            user.phone(),
+            user.picture(),
+            user.nat()
+        );
+
+        return userService.save(userToCreate);
+    }
+}

src/main/java/com/xpeho/spring_boot_java_random_user/presentation/controllers/UserController.java

@@ -9,6 +9,7 @@
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
@@ -76,4 +77,16 @@ ResponseEntity<UserEntity> updateRandomUser(
             @RequestBody
             UserRequest user
     );
+
+    @PostMapping("")
+    @Operation(
+        summary = "Create a user",
+        description = "Creates a new user in the database.",
+        parameters = {
+            @Parameter(name = "UserRequest", description = "User data to persist")
+        }
+    )
+    @ApiResponse(responseCode = "201", description = "User successfully created")
+    @ApiResponse(responseCode = "500", description = "Internal server error")
+    ResponseEntity<UserEntity> createUser(@RequestBody UserRequest user);
 }

src/main/java/com/xpeho/spring_boot_java_random_user/presentation/handlers/UserHandler.java

@@ -3,6 +3,7 @@
 import com.xpeho.spring_boot_java_random_user.domain.entities.UserEntity;
 import com.xpeho.spring_boot_java_random_user.domain.entities.UserRequest;
 import com.xpeho.spring_boot_java_random_user.domain.exceptions.UserNotFoundException;
+import com.xpeho.spring_boot_java_random_user.domain.usecases.CreateUserUseCase;
 import com.xpeho.spring_boot_java_random_user.domain.usecases.FetchAndSaveRandomUsersUseCase;
 import com.xpeho.spring_boot_java_random_user.domain.usecases.GetUserByIdUseCase;
 import com.xpeho.spring_boot_java_random_user.domain.usecases.UpdateRandomUserUseCase;
@@ -11,6 +12,7 @@
 import org.slf4j.LoggerFactory;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RestController;
 
 import java.io.IOException;
@@ -26,16 +28,21 @@ public class UserHandler implements UserController {
     private final FetchAndSaveRandomUsersUseCase fetchAndSaveRandomUsersUseCase;
     private final UpdateRandomUserUseCase updateRandomUserUseCase;
     private final GetUserByIdUseCase getUserByIdUseCase;
+    private final CreateUserUseCase createUserUseCase;
 
     public UserHandler(
             FetchAndSaveRandomUsersUseCase fetchAndSaveRandomUsersUseCase,
             UpdateRandomUserUseCase updateRandomUserUseCase,
-            GetUserByIdUseCase getUserByIdUseCase
+            GetUserByIdUseCase getUserByIdUseCase,
+            CreateUserUseCase createUserUseCase
     ) {
         this.fetchAndSaveRandomUsersUseCase = fetchAndSaveRandomUsersUseCase;
         this.updateRandomUserUseCase = updateRandomUserUseCase;
         this.getUserByIdUseCase = getUserByIdUseCase;
+        this.createUserUseCase = createUserUseCase;
+        
     }
+    
 
     @Override
     public ResponseEntity<List<UserEntity>> getRandomUsers(int count) {
@@ -59,15 +66,21 @@ public ResponseEntity<UserEntity> updateRandomUser(int id, UserRequest user) {
         }
     }
 
-        @Override
-        public ResponseEntity<UserEntity> getUserById(int id) {
-            try {
-                UserEntity user = getUserByIdUseCase.execute(id);
-                return ResponseEntity.ok(user);
-            } catch (UserNotFoundException e) {
-                logger.warn("warning: the requested user does not exist : {}", e.getMessage(), e);
-                return ResponseEntity.status(HttpStatus.NOT_FOUND).build();
-            }
+    @Override
+    public ResponseEntity<UserEntity> getUserById(int id) {
+        try {
+            UserEntity user = getUserByIdUseCase.execute(id);
+            return ResponseEntity.ok(user);
+        } catch (UserNotFoundException e) {
+            logger.warn("warning: the requested user does not exist : {}", e.getMessage(), e);
+            return ResponseEntity.status(HttpStatus.NOT_FOUND).build();
         }
+    }
 
+
+    @Override
+    public ResponseEntity<UserEntity> createUser(@RequestBody UserRequest user) {
+        UserEntity createdUser = createUserUseCase.execute(user);
+        return ResponseEntity.status(HttpStatus.CREATED).body(createdUser);
+    }
 }

src/test/java/com/xpeho/spring_boot_java_random_user/data/services/UserServiceImplTest.java

@@ -65,7 +65,6 @@ void shouldSaveMappedUserAndReturnMappedDomainEntity() {
         UserEntity input = new UserEntity(3L, "female", "Alice", "Smith", "Mrs", "alice@smith.com", "5678", "new-pic.jpg", "US");
 
         User daoToSave = new User();
-        daoToSave.setId(3L);
         daoToSave.setFirstname("Alice");
 
         User savedDao = new User();

src/test/java/com/xpeho/spring_boot_java_random_user/domain/usecases/CreateUserUseCaseTest.java

@@ -0,0 +1,45 @@
+package com.xpeho.spring_boot_java_random_user.domain.usecases;
+
+import com.xpeho.spring_boot_java_random_user.domain.entities.UserEntity;
+import com.xpeho.spring_boot_java_random_user.domain.entities.UserRequest;
+import com.xpeho.spring_boot_java_random_user.domain.services.UserService;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+class CreateUserUseCaseTest {
+    private UserService userService;
+    private CreateUserUseCase useCase;
+
+    @BeforeEach
+    void setUp() {
+        userService = mock(UserService.class);
+        useCase = new CreateUserUseCase(userService);
+    }
+
+    @Test
+    @DisplayName("Should create a user without keeping the input id")
+    void shouldCreateUserWithoutKeepingInputId() {
+        UserRequest payload = new UserRequest(
+            "female", "Alice", "Smith", "Mrs", "alice@smith.com", "5678", "new-pic.jpg", "US"
+        );
+        UserEntity createdUser = new UserEntity(
+            1L, "female", "Alice", "Smith", "Mrs", "alice@smith.com", "5678", "new-pic.jpg", "US"
+        );
+        UserEntity expectedSavedUser = new UserEntity(
+            null, "female", "Alice", "Smith", "Mrs", "alice@smith.com", "5678", "new-pic.jpg", "US"
+        );
+
+        when(userService.save(expectedSavedUser)).thenReturn(createdUser);
+
+        UserEntity result = useCase.execute(payload);
+
+        assertEquals(createdUser, result);
+        verify(userService).save(expectedSavedUser);
+    }
+}

src/test/java/com/xpeho/spring_boot_java_random_user/presentation/UserHandlerTest.java

@@ -3,6 +3,7 @@
 import com.xpeho.spring_boot_java_random_user.domain.entities.UserEntity;
 import com.xpeho.spring_boot_java_random_user.domain.entities.UserRequest;
 import com.xpeho.spring_boot_java_random_user.domain.exceptions.UserNotFoundException;
+import com.xpeho.spring_boot_java_random_user.domain.usecases.CreateUserUseCase;
 import com.xpeho.spring_boot_java_random_user.domain.usecases.FetchAndSaveRandomUsersUseCase;
 import com.xpeho.spring_boot_java_random_user.domain.usecases.GetUserByIdUseCase;
 import com.xpeho.spring_boot_java_random_user.domain.usecases.UpdateRandomUserUseCase;
@@ -29,14 +30,16 @@ class UserHandlerTest {
     private FetchAndSaveRandomUsersUseCase fetchAndSaveRandomUsersUseCase;
     private UpdateRandomUserUseCase updateRandomUserUseCase;
     private GetUserByIdUseCase getUserByIdUseCase;
+    private CreateUserUseCase createUserUseCase;
     private UserHandler userHandler;
 
     @BeforeEach
     void setUp() {
         fetchAndSaveRandomUsersUseCase = mock(FetchAndSaveRandomUsersUseCase.class);
         updateRandomUserUseCase = mock(UpdateRandomUserUseCase.class);
         getUserByIdUseCase = mock(GetUserByIdUseCase.class);
-        userHandler = new UserHandler(fetchAndSaveRandomUsersUseCase, updateRandomUserUseCase, getUserByIdUseCase);
+        createUserUseCase = mock(CreateUserUseCase.class);
+        userHandler = new UserHandler(fetchAndSaveRandomUsersUseCase, updateRandomUserUseCase, getUserByIdUseCase, createUserUseCase);
     }
 
     @Test
@@ -117,4 +120,18 @@ void shouldReturnNotFoundWhenUpdateRandomUserFails() {
         assertNull(response.getBody());
         verify(updateRandomUserUseCase, times(1)).execute(123, request);
     }
+
+    @Test
+    @DisplayName("Should return 201 and created user when createUser succeeds")
+    void shouldReturnCreatedWhenCreateUserSucceeds() {
+        UserRequest request = new UserRequest("female", "Emma", "Stone", "Ms", "emma@example.com", "0644444444", "emma.jpg", "FR");
+        UserEntity created = new UserEntity(10L, "female", "Emma", "Stone", "Ms", "emma@example.com", "0644444444", "emma.jpg", "FR");
+        when(createUserUseCase.execute(request)).thenReturn(created);
+
+        ResponseEntity<UserEntity> response = userHandler.createUser(request);
+
+        assertEquals(HttpStatus.CREATED, response.getStatusCode());
+        assertEquals(created, response.getBody());
+        verify(createUserUseCase, times(1)).execute(request);
+    }
 }