diff --git a/src/test/kotlin/dev/usbharu/hideout/core/service/reaction/ReactionServiceImplTest.kt b/src/test/kotlin/dev/usbharu/hideout/core/service/reaction/ReactionServiceImplTest.kt
new file mode 100644
index 00000000..8e39a439
--- /dev/null
+++ b/src/test/kotlin/dev/usbharu/hideout/core/service/reaction/ReactionServiceImplTest.kt
@@ -0,0 +1,127 @@
+package dev.usbharu.hideout.core.service.reaction
+
+
+import dev.usbharu.hideout.activitypub.service.activity.like.APReactionService
+import dev.usbharu.hideout.application.service.id.TwitterSnowflakeIdGenerateService
+import dev.usbharu.hideout.core.domain.model.reaction.Reaction
+import dev.usbharu.hideout.core.domain.model.reaction.ReactionRepository
+import dev.usbharu.hideout.core.query.ReactionQueryService
+import kotlinx.coroutines.test.runTest
+import org.jetbrains.exposed.exceptions.ExposedSQLException
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.extension.ExtendWith
+import org.mockito.InjectMocks
+import org.mockito.Mock
+import org.mockito.junit.jupiter.MockitoExtension
+import org.mockito.kotlin.*
+import utils.PostBuilder
+
+@ExtendWith(MockitoExtension::class)
+class ReactionServiceImplTest {
+
+    @Mock
+    private lateinit var reactionRepository: ReactionRepository
+
+    @Mock
+    private lateinit var apReactionService: APReactionService
+
+    @Mock
+    private lateinit var reactionQueryService: ReactionQueryService
+
+    @InjectMocks
+    private lateinit var reactionServiceImpl: ReactionServiceImpl
+
+    @Test
+    fun `receiveReaction リアクションが存在しないとき保存する`() = runTest {
+
+        val post = PostBuilder.of()
+
+        whenever(reactionQueryService.reactionAlreadyExist(eq(post.id), eq(post.userId), eq(0))).doReturn(false)
+        val generateId = TwitterSnowflakeIdGenerateService.generateId()
+        whenever(reactionRepository.generateId()).doReturn(generateId)
+
+        reactionServiceImpl.receiveReaction("❤", "example.com", post.userId, post.id)
+
+        verify(reactionRepository, times(1)).save(eq(Reaction(generateId, 0, post.id, post.userId)))
+    }
+
+    @Test
+    fun `receiveReaction リアクションが既に作成されていることを検知出来ずに例外が発生した場合は何もしない`() = runTest {
+        val post = PostBuilder.of()
+
+        whenever(reactionQueryService.reactionAlreadyExist(eq(post.id), eq(post.userId), eq(0))).doReturn(false)
+        val generateId = TwitterSnowflakeIdGenerateService.generateId()
+        whenever(
+            reactionRepository.save(
+                eq(
+                    Reaction(
+                        id = generateId,
+                        emojiId = 0,
+                        postId = post.id,
+                        userId = post.userId
+                    )
+                )
+            )
+        ).doAnswer {
+            throw ExposedSQLException(
+                null,
+                emptyList(), mock()
+            )
+        }
+        whenever(reactionRepository.generateId()).doReturn(generateId)
+
+        reactionServiceImpl.receiveReaction("❤", "example.com", post.userId, post.id)
+
+        verify(reactionRepository, times(1)).save(eq(Reaction(generateId, 0, post.id, post.userId)))
+    }
+
+    @Test
+    fun `receiveReaction リアクションが既に作成されている場合は何もしない`() = runTest() {
+        val post = PostBuilder.of()
+        whenever(reactionQueryService.reactionAlreadyExist(eq(post.id), eq(post.userId), eq(0))).doReturn(true)
+
+        reactionServiceImpl.receiveReaction("❤", "example.com", post.userId, post.id)
+
+        verify(reactionRepository, never()).save(any())
+    }
+
+    @Test
+    fun `sendReaction リアクションが存在しないとき保存して配送する`() = runTest {
+        val post = PostBuilder.of()
+        whenever(reactionQueryService.reactionAlreadyExist(eq(post.id), eq(post.userId), eq(0))).doReturn(false)
+        val generateId = TwitterSnowflakeIdGenerateService.generateId()
+        whenever(reactionRepository.generateId()).doReturn(generateId)
+
+        reactionServiceImpl.sendReaction("❤", post.userId, post.id)
+
+        verify(reactionRepository, times(1)).save(eq(Reaction(generateId, 0, post.id, post.userId)))
+        verify(apReactionService, times(1)).reaction(eq(Reaction(generateId, 0, post.id, post.userId)))
+    }
+
+    @Test
+    fun `sendReaction リアクションが存在するときは削除して保存して配送する`() = runTest {
+        val post = PostBuilder.of()
+        whenever(reactionQueryService.reactionAlreadyExist(eq(post.id), eq(post.userId), eq(0))).doReturn(true)
+        val generateId = TwitterSnowflakeIdGenerateService.generateId()
+        whenever(reactionRepository.generateId()).doReturn(generateId)
+
+        reactionServiceImpl.sendReaction("❤", post.userId, post.id)
+
+
+        verify(reactionRepository, times(1)).delete(eq(Reaction(generateId, 0, post.id, post.userId)))
+        verify(reactionRepository, times(1)).save(eq(Reaction(generateId, 0, post.id, post.userId)))
+        verify(apReactionService, times(1)).removeReaction(eq(Reaction(generateId, 0, post.id, post.userId)))
+        verify(apReactionService, times(1)).reaction(eq(Reaction(generateId, 0, post.id, post.userId)))
+    }
+
+    @Test
+    fun `removeReaction リアクションが存在する場合削除して配送`() = runTest {
+        val post = PostBuilder.of()
+        whenever(reactionQueryService.reactionAlreadyExist(eq(post.id), eq(post.userId), eq(0))).doReturn(true)
+
+        reactionServiceImpl.removeReaction(post.userId, post.id)
+
+        verify(reactionRepository, times(1)).delete(eq(Reaction(0, 0, post.id, post.userId)))
+        verify(apReactionService, times(1)).removeReaction(eq(Reaction(0, 0, post.id, post.userId)))
+    }
+}