diff --git a/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/test/kotlin/com/banjjoknim/springmultimodule/user/adapter/register/UserRegisterPersistenceAdapterTest.kt b/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/test/kotlin/com/banjjoknim/springmultimodule/user/adapter/register/UserRegisterPersistenceAdapterTest.kt
new file mode 100644
index 0000000..c05d7c5
--- /dev/null
+++ b/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/test/kotlin/com/banjjoknim/springmultimodule/user/adapter/register/UserRegisterPersistenceAdapterTest.kt	
@@ -0,0 +1,31 @@
+package com.banjjoknim.springmultimodule.user.adapter.register
+
+import com.banjjoknim.springmultimodule.user.User
+import com.banjjoknim.springmultimodule.user.UserRepository
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.jupiter.api.Test
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest
+import org.springframework.context.annotation.Import
+import org.springframework.data.repository.findByIdOrNull
+
+@DataJpaTest
+@Import(value = [UserRegisterPersistenceAdapter::class])
+class UserRegisterPersistenceAdapterTest {
+
+    @Autowired
+    private lateinit var userRegisterPersistenceAdapter: UserRegisterPersistenceAdapter
+
+    @Autowired
+    private lateinit var userRepository: UserRepository
+
+    @Test
+    fun `회원을 등록한다`() {
+        userRegisterPersistenceAdapter.registerUser(User("banjjoknim"))
+
+        val user = userRepository.findByIdOrNull(1)
+
+        assertThat(user).isNotNull
+        assertThat(user?.name).isEqualTo("banjjoknim")
+    }
+}
diff --git a/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/test/kotlin/com/banjjoknim/springmultimodule/user/adapter/register/UserRegisterWebAdapterTest.kt b/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/test/kotlin/com/banjjoknim/springmultimodule/user/adapter/register/UserRegisterWebAdapterTest.kt
new file mode 100644
index 0000000..4d8985b
--- /dev/null
+++ b/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/test/kotlin/com/banjjoknim/springmultimodule/user/adapter/register/UserRegisterWebAdapterTest.kt	
@@ -0,0 +1,54 @@
+package com.banjjoknim.springmultimodule.user.adapter.register
+
+import com.banjjoknim.springmultimodule.user.application.register.UserRegisterResponseData
+import com.banjjoknim.springmultimodule.user.application.register.UserRegisterUseCase
+import com.fasterxml.jackson.databind.ObjectMapper
+import com.ninjasquad.springmockk.MockkBean
+import io.mockk.every
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest
+import org.springframework.http.MediaType
+import org.springframework.test.web.servlet.MockMvc
+import org.springframework.test.web.servlet.post
+import org.springframework.test.web.servlet.result.MockMvcResultHandlers
+import org.springframework.test.web.servlet.setup.DefaultMockMvcBuilder
+import org.springframework.test.web.servlet.setup.MockMvcBuilders
+import org.springframework.web.context.WebApplicationContext
+import org.springframework.web.filter.CharacterEncodingFilter
+
+@WebMvcTest(controllers = [UserRegisterWebAdapter::class])
+class UserRegisterWebAdapterTest {
+
+    @Autowired
+    private lateinit var mockMvc: MockMvc
+
+    @Autowired
+    private lateinit var objectMapper: ObjectMapper
+
+    @MockkBean
+    private lateinit var userRegisterUseCase: UserRegisterUseCase
+
+    @BeforeEach
+    fun setUp(webApplicationContext: WebApplicationContext) {
+        mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext)
+            .addFilter<DefaultMockMvcBuilder>(CharacterEncodingFilter("UTF-8"))
+            .alwaysDo<DefaultMockMvcBuilder>(MockMvcResultHandlers.print())
+            .build()
+    }
+
+    @Test
+    fun `회원을 등록한다`() {
+        every { userRegisterUseCase.registerUser(any()) } returns UserRegisterResponseData(1)
+        val request = UserRegisterRequest("banjjoknim")
+
+        mockMvc.post("/users") {
+            contentType = MediaType.APPLICATION_JSON
+            content = objectMapper.writeValueAsString(request)
+        }.andExpect {
+            content { json("""{"userId":1}""") }
+            status { isOk() }
+        }
+    }
+}
diff --git a/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/test/kotlin/com/banjjoknim/springmultimodule/user/application/register/UserRegisterServiceTest.kt b/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/test/kotlin/com/banjjoknim/springmultimodule/user/application/register/UserRegisterServiceTest.kt
new file mode 100644
index 0000000..c808fee
--- /dev/null
+++ b/놀이터(예제 코드 작성)/spring-multi-module/module-api/src/test/kotlin/com/banjjoknim/springmultimodule/user/application/register/UserRegisterServiceTest.kt	
@@ -0,0 +1,23 @@
+package com.banjjoknim.springmultimodule.user.application.register
+
+import com.banjjoknim.springmultimodule.user.User
+import io.mockk.every
+import io.mockk.mockk
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.jupiter.api.Test
+
+class UserRegisterServiceTest {
+
+    private val userRegisterPersistencePort = mockk<UserRegisterPersistencePort>()
+    private val userRegisterService = UserRegisterService(userRegisterPersistencePort)
+
+    @Test
+    fun `회원을 등록한다`() {
+        every { userRegisterPersistencePort.registerUser(any()) } returns User("banjjoknim", 1)
+        val requestData = UserRegisterRequestData("banjjoknim")
+
+        val responseData = userRegisterService.registerUser(requestData)
+
+        assertThat(responseData).isEqualTo(UserRegisterResponseData(1))
+    }
+}