diff --git a/src/test/kotlin/dev/usbharu/hideout/service/ap/APUndoServiceImplTest.kt b/src/test/kotlin/dev/usbharu/hideout/service/ap/APUndoServiceImplTest.kt
new file mode 100644
index 00000000..3eb01c14
--- /dev/null
+++ b/src/test/kotlin/dev/usbharu/hideout/service/ap/APUndoServiceImplTest.kt
@@ -0,0 +1,48 @@
+package dev.usbharu.hideout.service.ap
+
+import dev.usbharu.hideout.domain.model.ActivityPubStringResponse
+import dev.usbharu.hideout.domain.model.ap.Follow
+import dev.usbharu.hideout.domain.model.ap.Undo
+import dev.usbharu.hideout.query.UserQueryService
+import io.ktor.http.*
+import kotlinx.coroutines.test.runTest
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Test
+import org.mockito.kotlin.doReturn
+import org.mockito.kotlin.eq
+import org.mockito.kotlin.mock
+import utils.TestTransaction
+import utils.UserBuilder
+import java.time.Instant
+
+class APUndoServiceImplTest {
+    @Test
+    fun `receiveUndo FollowのUndoを処理できる`() = runTest {
+
+        val userQueryService = mock<UserQueryService> {
+            onBlocking { findByUrl(eq("https://follower.example.com/actor")) } doReturn UserBuilder.remoteUserOf()
+            onBlocking { findByUrl(eq("https://example.com/actor")) } doReturn UserBuilder.localUserOf()
+        }
+        val apUndoServiceImpl = APUndoServiceImpl(
+            userService = mock(),
+            apUserService = mock(),
+            userQueryService = userQueryService,
+            transaction = TestTransaction
+        )
+
+        val undo = Undo(
+            name = "Undo",
+            actor = "https://follower.example.com/actor",
+            id = "https://follower.example.com/undo/follow",
+            `object` = Follow(
+                name = "Follow",
+                `object` = "https://example.com/actor",
+                actor = "https://follower.example.com/actor"
+            ),
+            published = Instant.now()
+        )
+        val activityPubResponse = apUndoServiceImpl.receiveUndo(undo)
+        assertEquals(ActivityPubStringResponse(HttpStatusCode.OK, "Accept"), activityPubResponse)
+    }
+
+}