src/main/kotlin/roomescape/member/business/MemberService.kt

@@ -7,8 +7,8 @@ import roomescape.member.exception.MemberErrorCode
 import roomescape.member.exception.MemberException
 import roomescape.member.infrastructure.persistence.MemberEntity
 import roomescape.member.infrastructure.persistence.MemberRepository
-import roomescape.member.web.MemberRetrieveListResponse
+import roomescape.member.infrastructure.persistence.Role
-import roomescape.member.web.toRetrieveResponse
+import roomescape.member.web.*
 
 @Service
 @Transactional(readOnly = true)
@@ -27,6 +27,21 @@ class MemberService(
         memberRepository.findByEmailAndPassword(email, password)
     }
 
+    @Transactional
+    fun create(request: SignupRequest): SignupResponse {
+        memberRepository.findByEmail(request.email)?.let {
+            throw MemberException(MemberErrorCode.DUPLICATE_EMAIL)
+        }
+
+        val member = MemberEntity(
+            name = request.name,
+            email = request.email,
+            password = request.password,
+            role = Role.MEMBER
+        )
+        return memberRepository.save(member).toSignupResponse()
+    }
+
     private fun fetchOrThrow(block: () -> MemberEntity?): MemberEntity {
         return block() ?: throw MemberException(MemberErrorCode.MEMBER_NOT_FOUND)
     }

src/main/kotlin/roomescape/member/docs/MemberAPI.kt

@@ -5,9 +5,12 @@ import io.swagger.v3.oas.annotations.responses.ApiResponse
 import io.swagger.v3.oas.annotations.responses.ApiResponses
 import io.swagger.v3.oas.annotations.tags.Tag
 import org.springframework.http.ResponseEntity
+import org.springframework.web.bind.annotation.RequestBody
 import roomescape.auth.web.support.Admin
 import roomescape.common.dto.response.CommonApiResponse
 import roomescape.member.web.MemberRetrieveListResponse
+import roomescape.member.web.SignupRequest
+import roomescape.member.web.SignupResponse
 
 @Tag(name = "2. 회원 API", description = "회원 정보를 관리할 때 사용합니다.")
 interface MemberAPI {
@@ -21,4 +24,14 @@ interface MemberAPI {
         )
     )
     fun findMembers(): ResponseEntity<CommonApiResponse<MemberRetrieveListResponse>>
+
+    @Operation(summary = "회원 가입")
+    @ApiResponses(
+        ApiResponse(
+            responseCode = "201",
+            description = "성공",
+            useReturnTypeSchema = true
+        )
+    )
+    fun signup(@RequestBody request: SignupRequest): ResponseEntity<CommonApiResponse<SignupResponse>>
 }

src/main/kotlin/roomescape/member/exception/MemberErrorCode.kt

@@ -8,5 +8,6 @@ enum class MemberErrorCode(
         override val errorCode: String,
         override val message: String
 ) : ErrorCode {
-    MEMBER_NOT_FOUND(HttpStatus.NOT_FOUND, "M001", "회원을 찾을 수 없어요.")
+    MEMBER_NOT_FOUND(HttpStatus.NOT_FOUND, "M001", "회원을 찾을 수 없어요."),
+    DUPLICATE_EMAIL(HttpStatus.CONFLICT, "M002", "이미 가입된 이메일이에요.")
 }

src/main/kotlin/roomescape/member/infrastructure/persistence/MemberRepository.kt

@@ -4,4 +4,6 @@ import org.springframework.data.jpa.repository.JpaRepository
 
 interface MemberRepository : JpaRepository<MemberEntity, Long> {
     fun findByEmailAndPassword(email: String, password: String): MemberEntity?
+
+    fun findByEmail(email: String): MemberEntity?
 }

src/main/kotlin/roomescape/member/web/MemberController.kt

@@ -2,16 +2,26 @@ package roomescape.member.web
 
 import org.springframework.http.ResponseEntity
 import org.springframework.web.bind.annotation.GetMapping
+import org.springframework.web.bind.annotation.PostMapping
+import org.springframework.web.bind.annotation.RequestBody
 import org.springframework.web.bind.annotation.RestController
 import roomescape.common.dto.response.CommonApiResponse
 import roomescape.member.business.MemberService
 import roomescape.member.docs.MemberAPI
+import java.net.URI
 
 @RestController
 class MemberController(
     private val memberService: MemberService
 ) : MemberAPI {
 
+    @PostMapping("/members")
+    override fun signup(@RequestBody request: SignupRequest): ResponseEntity<CommonApiResponse<SignupResponse>> {
+        val response: SignupResponse = memberService.create(request)
+        return ResponseEntity.created(URI.create("/members/${response.id}"))
+            .body(CommonApiResponse(response))
+    }
+
     @GetMapping("/members")
     override fun findMembers(): ResponseEntity<CommonApiResponse<MemberRetrieveListResponse>> {
         val response: MemberRetrieveListResponse = memberService.findMembers()

src/main/kotlin/roomescape/member/web/MemberDTO.kt

@@ -19,3 +19,19 @@ data class MemberRetrieveResponse(
 data class MemberRetrieveListResponse(
     val members: List<MemberRetrieveResponse>
 )
+
+data class SignupRequest(
+    val email: String,
+    val password: String,
+    val name: String
+)
+
+data class SignupResponse(
+    val id: Long,
+    val name: String,
+)
+
+fun MemberEntity.toSignupResponse(): SignupResponse = SignupResponse(
+    id = this.id!!,
+    name = this.name
+)

src/test/kotlin/roomescape/member/controller/MemberControllerTest.kt

@@ -4,12 +4,16 @@ import io.kotest.assertions.assertSoftly
 import io.kotest.matchers.collections.shouldContainAll
 import io.kotest.matchers.shouldBe
 import io.mockk.every
+import io.mockk.mockk
 import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest
 import org.springframework.test.web.servlet.MockMvc
 import roomescape.auth.exception.AuthErrorCode
+import roomescape.member.exception.MemberErrorCode
+import roomescape.member.infrastructure.persistence.Role
 import roomescape.member.web.MemberController
 import roomescape.member.web.MemberRetrieveListResponse
+import roomescape.member.web.SignupRequest
 import roomescape.util.MemberFixture
 import roomescape.util.RoomescapeApiTest
 import kotlin.random.Random
@@ -82,5 +86,61 @@ class MemberControllerTest(
                 }
             }
         }
+
+        given("POST /members") {
+            val endpoint = "/members"
+            val request = SignupRequest(
+                name = "name",
+                email = "email@email.com",
+                password = "password"
+            )
+            `when`("같은 이메일이 없으면") {
+                every {
+                    memberRepository.findByEmail(request.email)
+                } returns null
+
+                every {
+                    memberRepository.save(any())
+                } returns MemberFixture.create(
+                    id = 1,
+                    name = request.name,
+                    account = request.email,
+                    password = request.password,
+                    role = Role.MEMBER
+                )
+
+                then("id과 이름을 담아 성공 응답") {
+                    runPostTest(
+                        mockMvc = mockMvc,
+                        endpoint = endpoint,
+                        body = request
+                    ) {
+                        status { isCreated() }
+                        jsonPath("$.data.name") { value(request.name) }
+                        jsonPath("$.data.id") { value(1) }
+                    }
+                }
+            }
+
+            `when`("같은 이메일이 있으면") {
+                every {
+                    memberRepository.findByEmail(request.email)
+                } returns mockk()
+
+                then("에러 응답") {
+                    val expectedError = MemberErrorCode.DUPLICATE_EMAIL
+
+                    runPostTest(
+                        mockMvc = mockMvc,
+                        endpoint = endpoint,
+                        body = request
+                    ) {
+                        status { isEqualTo(expectedError.httpStatus.value()) }
+                        jsonPath("$.code") { value(expectedError.errorCode) }
+                    }
+
+                }
+            }
+        }
     }
 }