diff --git a/app/pkg/slack/client.go b/app/pkg/slack/client.go
index 18eddad..1a484ac 100644
--- a/app/pkg/slack/client.go
+++ b/app/pkg/slack/client.go
@@ -28,6 +28,7 @@ type Client interface {
 	PostEphemeral(ctx context.Context, channelID, userID, ts, message string) error
 	GetConversationReplies(ctx context.Context, channelID, ts string) ([]slack.Message, error)
 	GetUsersInfo(ctx context.Context, userID ...string) (*[]slack.User, error)
+	GetReaction(ctx context.Context, channelID, ts string, full bool) ([]slack.ItemReaction, error)
 
 	GetClient() *slack.Client
 	GetAppUserID() string
@@ -118,6 +119,15 @@ func (c *client) GetUsersInfo(ctx context.Context, userID ...string) (*[]slack.U
 	return users, nil
 }
 
+func (c *client) GetReaction(ctx context.Context, channelID, ts string, full bool) ([]slack.ItemReaction, error) {
+	return c.Client.GetReactionsContext(ctx, slack.ItemRef{
+		Channel:   channelID,
+		Timestamp: ts,
+	}, slack.GetReactionsParameters{
+		Full: full,
+	})
+}
+
 func (c *client) GetClient() *slack.Client {
 	return c.Client
 }
diff --git a/app/pkg/slack/hoge_test.go b/app/pkg/slack/hoge_test.go
deleted file mode 100644
index 4b3b8cf..0000000
--- a/app/pkg/slack/hoge_test.go
+++ /dev/null
@@ -1,17 +0,0 @@
-/*
- * Copyright 2023 Money Forward, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package slack