diff --git a/src/test/java/roomescape/system/auth/business/AuthServiceTest.kt b/src/test/java/roomescape/system/auth/business/AuthServiceTest.kt
index 0bcfcd26..8e415266 100644
--- a/src/test/java/roomescape/system/auth/business/AuthServiceTest.kt
+++ b/src/test/java/roomescape/system/auth/business/AuthServiceTest.kt
@@ -1,66 +1,83 @@
-package roomescape.system.auth.business;
+package roomescape.system.auth.business
 
-import static org.assertj.core.api.Assertions.*;
+import io.kotest.assertions.assertSoftly
+import io.kotest.assertions.throwables.shouldThrow
+import io.kotest.core.spec.style.BehaviorSpec
+import io.kotest.matchers.shouldBe
+import io.mockk.every
+import io.mockk.mockk
+import org.springframework.data.repository.findByIdOrNull
+import roomescape.common.JwtFixture
+import roomescape.common.MemberFixture
+import roomescape.member.business.MemberService
+import roomescape.member.infrastructure.persistence.Member
+import roomescape.member.infrastructure.persistence.MemberRepository
+import roomescape.system.auth.infrastructure.jwt.JwtHandler
+import roomescape.system.auth.service.AuthService
+import roomescape.system.exception.ErrorType
+import roomescape.system.exception.RoomEscapeException
 
-import org.assertj.core.api.Assertions;
-import org.junit.jupiter.api.DisplayName;
-import org.junit.jupiter.api.Test;
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.boot.test.context.SpringBootTest;
-import org.springframework.context.annotation.Import;
 
-import roomescape.member.business.MemberService;
-import roomescape.member.infrastructure.persistence.Member;
-import roomescape.member.infrastructure.persistence.MemberRepository;
-import roomescape.member.infrastructure.persistence.Role;
-import roomescape.system.auth.service.AuthService;
-import roomescape.system.auth.web.LoginRequest;
-import roomescape.system.auth.infrastructure.jwt.JwtHandler;
-import roomescape.system.auth.infrastructure.jwt.TokenDto;
-import roomescape.system.exception.RoomEscapeException;
+class AuthServiceTest : BehaviorSpec({
+    val memberRepository: MemberRepository = mockk()
+    val memberService: MemberService = MemberService(memberRepository)
+    val jwtHandler: JwtHandler = JwtFixture.create()
 
-@SpringBootTest
-@Import({AuthService.class, JwtHandler.class, MemberService.class})
-class AuthServiceTest {
+    val authService = AuthService(memberService, jwtHandler)
+    val user: Member = MemberFixture.user()
 
-	@Autowired
-	private AuthService authService;
-	@Autowired
-	private MemberRepository memberRepository;
+    Given("로그인 요청을 받으면") {
+        When("이메일과 비밀번호로 회원을 찾고") {
+            val request = MemberFixture.userLoginRequest()
 
-	@Test
-	@DisplayName("로그인 성공시 JWT accessToken 을 반환한다.")
-	void loginSuccess() {
-		// given
-		Member member = memberRepository.save(new Member(null, "이름", "test@test.com", "12341234", Role.MEMBER));
+            Then("회원이 있다면 JWT 토큰을 생성한 뒤 반환한다.") {
+                every {
+                    memberRepository.findByEmailAndPassword(request.email, request.password)
+                } returns user
 
-		// when
-		TokenDto response = authService.login(new LoginRequest(member.getEmail(), member.getPassword()));
+                val accessToken: String = authService.login(request).accessToken
 
-		// then
-		assertThat(response.accessToken()).isNotNull();
-	}
+                accessToken.isNotBlank() shouldBe true
+                jwtHandler.getMemberIdFromToken(accessToken) shouldBe user.id
+            }
 
-	@Test
-	@DisplayName("존재하지 않는 회원 email 또는 password로 로그인하면 예외가 발생한다.")
-	void loginFailByNotExistMemberInfo() {
-		// given
-		String notExistEmail = "invalid@test.com";
-		String notExistPassword = "invalid1234";
+            Then("회원이 없다면 예외를 던진다.") {
+                every {
+                    memberRepository.findByEmailAndPassword(request.email, request.password)
+                } returns null
 
-		// when & then
-		Assertions.assertThatThrownBy(() -> authService.login(new LoginRequest(notExistEmail, notExistPassword)))
-			.isInstanceOf(RoomEscapeException.class);
-	}
+                val exception = shouldThrow<RoomEscapeException> {
+                    authService.login(request)
+                }
 
-	@Test
-	@DisplayName("존재하지 않는 회원의 memberId로 로그인 여부를 체크하면 예외가 발생한다.")
-	void checkLoginFailByNotExistMemberInfo() {
-		// given
-		Long notExistMemberId = (long)(memberRepository.findAll().size() + 1);
+                exception.errorType shouldBe ErrorType.MEMBER_NOT_FOUND
+            }
+        }
+    }
 
-		// when & then
-		Assertions.assertThatThrownBy(() -> authService.checkLogin(notExistMemberId))
-			.isInstanceOf(RoomEscapeException.class);
-	}
-}
+    Given("로그인 확인 요청을 받으면") {
+        When("회원 ID로 회원을 찾고") {
+            val userId: Long = user.id!!
+
+            Then("회원이 있다면 회원의 이름을 반환한다.") {
+                every { memberRepository.findByIdOrNull(userId) } returns user
+
+                val response = authService.checkLogin(userId)
+
+                assertSoftly(response) {
+                    this.name shouldBe user.name
+                }
+            }
+
+            Then("회원이 없다면 예외를 던진다.") {
+                every { memberRepository.findByIdOrNull(userId) } returns null
+
+                val exception = shouldThrow<RoomEscapeException> {
+                    authService.checkLogin(userId)
+                }
+
+                exception.errorType shouldBe ErrorType.MEMBER_NOT_FOUND
+            }
+        }
+    }
+})