diff --git a/src/test/kotlin/dev/usbharu/hideout/service/ap/APServiceImplTest.kt b/src/test/kotlin/dev/usbharu/hideout/service/ap/APServiceImplTest.kt
new file mode 100644
index 00000000..c3140427
--- /dev/null
+++ b/src/test/kotlin/dev/usbharu/hideout/service/ap/APServiceImplTest.kt
@@ -0,0 +1,270 @@
+package dev.usbharu.hideout.service.ap
+
+import dev.usbharu.hideout.exception.JsonParseException
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertThrows
+import org.mockito.kotlin.mock
+import utils.JsonObjectMapper.objectMapper
+import kotlin.test.assertEquals
+
+class APServiceImplTest {
+    @Test
+    fun `parseActivity 正常なActivityをパースできる`() {
+        val apServiceImpl = APServiceImpl(
+            apReceiveFollowService = mock(),
+            apUndoService = mock(),
+            apAcceptService = mock(),
+            apCreateService = mock(),
+            apLikeService = mock(),
+            objectMapper = objectMapper,
+            apReceiveFollowJobService = mock(),
+            apNoteJobService = mock(),
+            apReactionJobService = mock()
+        )
+
+        //language=JSON
+        val activityType = apServiceImpl.parseActivity("""{"type": "Follow"}""")
+
+        assertEquals(ActivityType.Follow, activityType)
+    }
+
+    @Test
+    fun `parseActivity Typeが配列のActivityをパースできる`() {
+        val apServiceImpl = APServiceImpl(
+            apReceiveFollowService = mock(),
+            apUndoService = mock(),
+            apAcceptService = mock(),
+            apCreateService = mock(),
+            apLikeService = mock(),
+            objectMapper = objectMapper,
+            apReceiveFollowJobService = mock(),
+            apNoteJobService = mock(),
+            apReactionJobService = mock()
+        )
+
+        //language=JSON
+        val activityType = apServiceImpl.parseActivity("""{"type": ["Follow"]}""")
+
+        assertEquals(ActivityType.Follow, activityType)
+    }
+
+    @Test
+    fun `parseActivity Typeが配列で関係ない物が入っていてもパースできる`() {
+        val apServiceImpl = APServiceImpl(
+            apReceiveFollowService = mock(),
+            apUndoService = mock(),
+            apAcceptService = mock(),
+            apCreateService = mock(),
+            apLikeService = mock(),
+            objectMapper = objectMapper,
+            apReceiveFollowJobService = mock(),
+            apNoteJobService = mock(),
+            apReactionJobService = mock()
+        )
+
+        //language=JSON
+        val activityType = apServiceImpl.parseActivity("""{"type": ["Hello","Follow"]}""")
+
+        assertEquals(ActivityType.Follow, activityType)
+    }
+
+    @Test
+    fun `parseActivity jsonとして解釈できない場合JsonParseExceptionがthrowされる`() {
+        val apServiceImpl = APServiceImpl(
+            apReceiveFollowService = mock(),
+            apUndoService = mock(),
+            apAcceptService = mock(),
+            apCreateService = mock(),
+            apLikeService = mock(),
+            objectMapper = objectMapper,
+            apReceiveFollowJobService = mock(),
+            apNoteJobService = mock(),
+            apReactionJobService = mock()
+        )
+
+        //language=JSON
+        assertThrows<JsonParseException> {
+            apServiceImpl.parseActivity("""hoge""")
+        }
+    }
+
+    @Test
+    fun `parseActivity 空の場合JsonParseExceptionがthrowされる`() {
+        val apServiceImpl = APServiceImpl(
+            apReceiveFollowService = mock(),
+            apUndoService = mock(),
+            apAcceptService = mock(),
+            apCreateService = mock(),
+            apLikeService = mock(),
+            objectMapper = objectMapper,
+            apReceiveFollowJobService = mock(),
+            apNoteJobService = mock(),
+            apReactionJobService = mock()
+        )
+
+        //language=JSON
+        assertThrows<JsonParseException> {
+            apServiceImpl.parseActivity("")
+        }
+    }
+
+    @Test
+    fun `parseActivity jsonにtypeプロパティがない場合JsonParseExceptionがthrowされる`() {
+        val apServiceImpl = APServiceImpl(
+            apReceiveFollowService = mock(),
+            apUndoService = mock(),
+            apAcceptService = mock(),
+            apCreateService = mock(),
+            apLikeService = mock(),
+            objectMapper = objectMapper,
+            apReceiveFollowJobService = mock(),
+            apNoteJobService = mock(),
+            apReactionJobService = mock()
+        )
+
+        //language=JSON
+        assertThrows<JsonParseException> {
+            apServiceImpl.parseActivity("""{"actor": "https://example.com"}""")
+        }
+    }
+
+    @Test
+    fun `parseActivity typeが配列でないときtypeが未定義の場合IllegalArgumentExceptionがthrowされる`() {
+        val apServiceImpl = APServiceImpl(
+            apReceiveFollowService = mock(),
+            apUndoService = mock(),
+            apAcceptService = mock(),
+            apCreateService = mock(),
+            apLikeService = mock(),
+            objectMapper = objectMapper,
+            apReceiveFollowJobService = mock(),
+            apNoteJobService = mock(),
+            apReactionJobService = mock()
+        )
+
+        //language=JSON
+        assertThrows<IllegalArgumentException> {
+            apServiceImpl.parseActivity("""{"type": "Hoge"}""")
+        }
+    }
+
+    @Test
+    fun `parseActivity typeが配列のとき定義済みのtypeを見つけられなかった場合IllegalArgumentExceptionがthrowされる`() {
+        val apServiceImpl = APServiceImpl(
+            apReceiveFollowService = mock(),
+            apUndoService = mock(),
+            apAcceptService = mock(),
+            apCreateService = mock(),
+            apLikeService = mock(),
+            objectMapper = objectMapper,
+            apReceiveFollowJobService = mock(),
+            apNoteJobService = mock(),
+            apReactionJobService = mock()
+        )
+
+        //language=JSON
+        assertThrows<IllegalArgumentException> {
+            apServiceImpl.parseActivity("""{"type": ["Hoge","Fuga"]}""")
+        }
+    }
+
+    @Test
+    fun `parseActivity typeが空の場合IllegalArgumentExceptionがthrowされる`() {
+        val apServiceImpl = APServiceImpl(
+            apReceiveFollowService = mock(),
+            apUndoService = mock(),
+            apAcceptService = mock(),
+            apCreateService = mock(),
+            apLikeService = mock(),
+            objectMapper = objectMapper,
+            apReceiveFollowJobService = mock(),
+            apNoteJobService = mock(),
+            apReactionJobService = mock()
+        )
+
+        //language=JSON
+        assertThrows<IllegalArgumentException> {
+            apServiceImpl.parseActivity("""{"type": ""}""")
+        }
+    }
+
+    @Test
+    fun `parseActivity typeに指定されている文字の判定がcase-insensitiveで行われる`() {
+        val apServiceImpl = APServiceImpl(
+            apReceiveFollowService = mock(),
+            apUndoService = mock(),
+            apAcceptService = mock(),
+            apCreateService = mock(),
+            apLikeService = mock(),
+            objectMapper = objectMapper,
+            apReceiveFollowJobService = mock(),
+            apNoteJobService = mock(),
+            apReactionJobService = mock()
+        )
+
+        //language=JSON
+        val activityType = apServiceImpl.parseActivity("""{"type": "FoLlOw"}""")
+
+        assertEquals(ActivityType.Follow, activityType)
+    }
+
+    @Test
+    fun `parseActivity typeが配列のとき指定されている文字の判定がcase-insensitiveで行われる`() {
+        val apServiceImpl = APServiceImpl(
+            apReceiveFollowService = mock(),
+            apUndoService = mock(),
+            apAcceptService = mock(),
+            apCreateService = mock(),
+            apLikeService = mock(),
+            objectMapper = objectMapper,
+            apReceiveFollowJobService = mock(),
+            apNoteJobService = mock(),
+            apReactionJobService = mock()
+        )
+
+        //language=JSON
+        val activityType = apServiceImpl.parseActivity("""{"type": ["HoGE","fOllOw"]}""")
+
+        assertEquals(ActivityType.Follow, activityType)
+    }
+
+    @Test
+    fun `parseActivity activityがarrayのときJsonParseExceptionがthrowされる`() {
+        val apServiceImpl = APServiceImpl(
+            apReceiveFollowService = mock(),
+            apUndoService = mock(),
+            apAcceptService = mock(),
+            apCreateService = mock(),
+            apLikeService = mock(),
+            objectMapper = objectMapper,
+            apReceiveFollowJobService = mock(),
+            apNoteJobService = mock(),
+            apReactionJobService = mock()
+        )
+
+        //language=JSON
+        assertThrows<JsonParseException> {
+            apServiceImpl.parseActivity("""[{"type": "Follow"},{"type": "Accept"}]""")
+        }
+    }
+
+    @Test
+    fun `parseActivity activityがvalueのときJsonParseExceptionがthrowされる`() {
+        val apServiceImpl = APServiceImpl(
+            apReceiveFollowService = mock(),
+            apUndoService = mock(),
+            apAcceptService = mock(),
+            apCreateService = mock(),
+            apLikeService = mock(),
+            objectMapper = objectMapper,
+            apReceiveFollowJobService = mock(),
+            apNoteJobService = mock(),
+            apReactionJobService = mock()
+        )
+
+        //language=JSON
+        assertThrows<IllegalArgumentException> {
+            apServiceImpl.parseActivity(""""hoge"""")
+        }
+    }
+}