feat: 동시성 테스트를 위한 api 생성

src/main/java/com/threestar/trainus/domain/test/controller/TestConcurrencyController.java

@@ -0,0 +1,51 @@
+package com.threestar.trainus.domain.test.controller;
+
+import com.threestar.trainus.domain.coupon.user.dto.CreateUserCouponResponseDto;
+import com.threestar.trainus.domain.coupon.user.service.CouponService;
+import com.threestar.trainus.domain.lesson.student.dto.LessonApplicationResponseDto;
+import com.threestar.trainus.domain.lesson.student.service.StudentLessonService;
+import com.threestar.trainus.domain.test.dto.TestRequestDto;
+import com.threestar.trainus.domain.test.service.TestUserService;
+import com.threestar.trainus.domain.user.entity.User;
+import com.threestar.trainus.global.unit.BaseResponse;
+
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import lombok.RequiredArgsConstructor;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+@Tag(name = "동시성 테스트 API", description = "선착순 기능 테스트를 위한 API")
+@RestController
+@RequestMapping("/test")
+@RequiredArgsConstructor
+public class TestConcurrencyController {
+
+	private final CouponService couponService;
+	private final StudentLessonService studentLessonService;
+	private final TestUserService testUserService;
+
+	@PostMapping("/coupons/{couponId}")
+	@Operation(summary = "쿠폰 발급 동시성 테스트", description = "쿠폰을 발급받는 테스트 API")
+	public ResponseEntity<BaseResponse<CreateUserCouponResponseDto>> issueCouponForTest(
+		@PathVariable Long couponId,
+		@RequestBody TestRequestDto testRequestDto
+	) {
+		User user = testUserService.findOrCreateUser(testRequestDto.getUserId());
+		CreateUserCouponResponseDto responseDto = couponService.createUserCoupon(user.getId(), couponId);
+		return BaseResponse.ok("쿠폰 발급 완료", responseDto, HttpStatus.CREATED);
+	}
+
+	@PostMapping("/lessons/{lessonId}/application")
+	@Operation(summary = "레슨 신청 동시성 테스트", description = "레슨을 신청하는 테스트 API")
+	public ResponseEntity<BaseResponse<LessonApplicationResponseDto>> applyToLessonForTest(
+		@PathVariable Long lessonId,
+		@RequestBody TestRequestDto testRequestDto
+	) {
+		User user = testUserService.findOrCreateUser(testRequestDto.getUserId());
+		LessonApplicationResponseDto response = studentLessonService.applyToLessonWithLock(lessonId, user.getId());
+		return BaseResponse.ok("레슨 신청 완료", response, HttpStatus.OK);
+	}
+}

src/main/java/com/threestar/trainus/domain/test/dto/TestRequestDto.java

@@ -0,0 +1,10 @@
+package com.threestar.trainus.domain.test.dto;
+
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@NoArgsConstructor
+public class TestRequestDto {
+	private Long userId;
+}

src/main/java/com/threestar/trainus/domain/test/service/TestUserService.java

@@ -0,0 +1,51 @@
+package com.threestar.trainus.domain.test.service;
+
+import com.threestar.trainus.domain.profile.service.ProfileFacadeService;
+import com.threestar.trainus.domain.user.entity.User;
+import com.threestar.trainus.domain.user.entity.UserRole;
+import com.threestar.trainus.domain.user.repository.UserRepository;
+
+import lombok.RequiredArgsConstructor;
+
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.Optional;
+
+@Service
+@RequiredArgsConstructor
+public class TestUserService {
+
+	private final UserRepository userRepository;
+	private final PasswordEncoder passwordEncoder;
+	private final ProfileFacadeService profileFacadeService;
+
+	@Transactional
+	public User findOrCreateUser(Long userId) {
+		Optional<User> existingUser = userRepository.findById(userId);
+		if (existingUser.isPresent()) {
+			return existingUser.get();
+		}
+		String email = "testuser" + userId + "@example.com";
+		String nickname = "testuser" + userId;
+
+		if (userRepository.existsByEmail(email) || userRepository.existsByNickname(nickname)) {
+			return userRepository.findByEmail(email)
+				.orElseThrow(() -> new IllegalStateException("테스트 유저 생성 실패"));
+		}
+
+		String encodedPassword = passwordEncoder.encode("password");
+		User newUser = User.builder()
+			.email(email)
+			.password(encodedPassword)
+			.nickname(nickname)
+			.role(UserRole.USER)
+			.build();
+
+		User savedUser = userRepository.save(newUser);
+		profileFacadeService.createDefaultProfile(savedUser);
+
+		return savedUser;
+	}
+}

src/main/java/com/threestar/trainus/global/config/security/SecurityConfig.java

@@ -27,7 +27,7 @@ public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
 			.authorizeHttpRequests(auth -> auth
 				.requestMatchers("/api/v1/users/**", "/api/lessons/test-auth", "/swagger-ui/**", "/v3/api-docs/**",
 					"/api/v1/profiles/**", "/api/v1/lessons/**", "/api/v1/comments/**", "/api/v1/reviews/**",
-					"/api/v1/rankings/**", "/api/v1/payments/**")
+					"/api/v1/rankings/**", "/api/v1/payments/**", "/test/**")
 				.permitAll()
 				.requestMatchers("/api/v1/admin/**")
 				.hasRole("ADMIN")