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diff --git a/test/pleroma/web/activity_pub/transmogrifier/emoji_react_handling_test.exs b/test/pleroma/web/activity_pub/transmogrifier/emoji_react_handling_test.exs
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ActivityPub.Transmogrifier.EmojiReactHandlingTest do
+  use Pleroma.DataCase
+
+  alias Pleroma.Activity
+  alias Pleroma.Object
+  alias Pleroma.Web.ActivityPub.Transmogrifier
+  alias Pleroma.Web.CommonAPI
+
+  import Pleroma.Factory
+
+  test "it works for incoming emoji reactions" do
+    user = insert(:user)
+    other_user = insert(:user, local: false)
+    {:ok, activity} = CommonAPI.post(user, %{status: "hello"})
+
+    data =
+      File.read!("test/fixtures/emoji-reaction.json")
+      |> Poison.decode!()
+      |> Map.put("object", activity.data["object"])
+      |> Map.put("actor", other_user.ap_id)
+
+    {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
+
+    assert data["actor"] == other_user.ap_id
+    assert data["type"] == "EmojiReact"
+    assert data["id"] == "http://mastodon.example.org/users/admin#reactions/2"
+    assert data["object"] == activity.data["object"]
+    assert data["content"] == "👌"
+
+    object = Object.get_by_ap_id(data["object"])
+
+    assert object.data["reaction_count"] == 1
+    assert match?([["👌", _]], object.data["reactions"])
+  end
+
+  test "it reject invalid emoji reactions" do
+    user = insert(:user)
+    other_user = insert(:user, local: false)
+    {:ok, activity} = CommonAPI.post(user, %{status: "hello"})
+
+    data =
+      File.read!("test/fixtures/emoji-reaction-too-long.json")
+      |> Poison.decode!()
+      |> Map.put("object", activity.data["object"])
+      |> Map.put("actor", other_user.ap_id)
+
+    assert {:error, _} = Transmogrifier.handle_incoming(data)
+
+    data =
+      File.read!("test/fixtures/emoji-reaction-no-emoji.json")
+      |> Poison.decode!()
+      |> Map.put("object", activity.data["object"])
+      |> Map.put("actor", other_user.ap_id)
+
+    assert {:error, _} = Transmogrifier.handle_incoming(data)
+  end
+end