diff --git a/pennyway-domain/domain-service/src/test/java/kr/co/pennyway/domain/context/account/integration/DeviceTokenRegisterServiceIntegrationTest.java b/pennyway-domain/domain-service/src/test/java/kr/co/pennyway/domain/context/account/integration/DeviceTokenRegisterServiceIntegrationTest.java
new file mode 100644
index 000000000..d9383d712
--- /dev/null
+++ b/pennyway-domain/domain-service/src/test/java/kr/co/pennyway/domain/context/account/integration/DeviceTokenRegisterServiceIntegrationTest.java
@@ -0,0 +1,106 @@
+package kr.co.pennyway.domain.context.account.integration;
+
+import kr.co.pennyway.domain.common.repository.ExtendedRepositoryFactory;
+import kr.co.pennyway.domain.config.DomainServiceIntegrationProfileResolver;
+import kr.co.pennyway.domain.config.DomainServiceTestInfraConfig;
+import kr.co.pennyway.domain.config.JpaTestConfig;
+import kr.co.pennyway.domain.context.account.service.DeviceTokenRegisterService;
+import kr.co.pennyway.domain.context.common.fixture.UserFixture;
+import kr.co.pennyway.domain.domains.device.domain.DeviceToken;
+import kr.co.pennyway.domain.domains.device.exception.DeviceTokenErrorCode;
+import kr.co.pennyway.domain.domains.device.exception.DeviceTokenErrorException;
+import kr.co.pennyway.domain.domains.device.repository.DeviceTokenRepository;
+import kr.co.pennyway.domain.domains.device.service.DeviceTokenRdbService;
+import kr.co.pennyway.domain.domains.user.domain.User;
+import kr.co.pennyway.domain.domains.user.repository.UserRepository;
+import kr.co.pennyway.domain.domains.user.service.UserRdbService;
+import lombok.extern.slf4j.Slf4j;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.domain.EntityScan;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.context.annotation.Import;
+import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+import org.springframework.test.context.ActiveProfiles;
+import org.springframework.transaction.annotation.Transactional;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+@Slf4j
+@EnableAutoConfiguration
+@SpringBootTest(classes = {DeviceTokenRegisterService.class, UserRdbService.class, DeviceTokenRdbService.class})
+@EntityScan(basePackageClasses = {User.class, DeviceToken.class})
+@EnableJpaRepositories(basePackageClasses = {UserRepository.class, DeviceTokenRepository.class}, repositoryFactoryBeanClass = ExtendedRepositoryFactory.class)
+@ActiveProfiles(resolver = DomainServiceIntegrationProfileResolver.class)
+@Import(value = {JpaTestConfig.class})
+public class DeviceTokenRegisterServiceIntegrationTest extends DomainServiceTestInfraConfig {
+    @Autowired
+    private DeviceTokenRegisterService deviceTokenRegisterService;
+
+    @Autowired
+    private UserRepository userRepository;
+
+    @Autowired
+    private DeviceTokenRepository deviceTokenRepository;
+
+    private User savedUser;
+
+    @BeforeEach
+    void setUp() {
+        savedUser = userRepository.save(UserFixture.GENERAL_USER.toUser());
+    }
+
+    @Test
+    @Transactional
+    @DisplayName("디바이스 토큰 등록 시 기존 활성 토큰은 비활성화됩니다")
+    void shouldDeactivateExistingTokensWhenRegisteringNew() {
+        // given
+        String deviceId = "device1";
+
+        // when
+        DeviceToken firstToken = deviceTokenRegisterService.execute(savedUser.getId(), deviceId, "Android", "token1");
+        DeviceToken secondToken = deviceTokenRegisterService.execute(savedUser.getId(), deviceId, "Android", "token2");
+
+        // then
+        assertFalse(firstToken.isActivated());
+        assertTrue(secondToken.isActivated());
+    }
+
+    @Test
+    @Transactional
+    @DisplayName("활성화된 토큰이 다른 디바이스에서 사용되면 예외가 발생합니다")
+    void shouldThrowExceptionWhenActiveTokenIsUsedOnDifferentDevice() {
+        // given
+        String token = "token1";
+        deviceTokenRegisterService.execute(savedUser.getId(), "device1", "Android", token);
+
+        // when & then
+        DeviceTokenErrorException exception = assertThrowsExactly(
+                DeviceTokenErrorException.class,
+                () -> deviceTokenRegisterService.execute(savedUser.getId(), "device2", "iPhone", token)
+        );
+        assertEquals(DeviceTokenErrorCode.DUPLICATED_DEVICE_TOKEN, exception.getBaseErrorCode());
+    }
+
+    @Test
+    @DisplayName("같은 deviceId, token / 다른 사용자 갱신 요청이라면, 디바이스 토큰의 소유권이 다른 사용자에게 이전됩니다")
+    void shouldTransferTokenOwnership() {
+        // given
+        User anotherUser = userRepository.save(UserFixture.GENERAL_USER.toUser());
+
+        String deviceId = "device1";
+        String token = "token1";
+
+        // when
+        DeviceToken firstUserToken = deviceTokenRegisterService.execute(savedUser.getId(), deviceId, "Android", token);
+        DeviceToken secondUserToken = deviceTokenRegisterService.execute(anotherUser.getId(), deviceId, "Android", token);
+
+        // then
+        assertEquals(firstUserToken.getId(), secondUserToken.getId());
+        assertEquals(anotherUser.getId(), secondUserToken.getUser().getId());
+        assertTrue(secondUserToken.isActivated());
+    }
+}