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diff --git a/test/pleroma/emoji/loader_test.exs b/test/pleroma/emoji/loader_test.exs
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Emoji.LoaderTest do
+  use ExUnit.Case, async: true
+  alias Pleroma.Emoji.Loader
+
+  describe "match_extra/2" do
+    setup do
+      groups = [
+        "list of files": ["/emoji/custom/first_file.png", "/emoji/custom/second_file.png"],
+        "wildcard folder": "/emoji/custom/*/file.png",
+        "wildcard files": "/emoji/custom/folder/*.png",
+        "special file": "/emoji/custom/special.png"
+      ]
+
+      {:ok, groups: groups}
+    end
+
+    test "config for list of files", %{groups: groups} do
+      group =
+        groups
+        |> Loader.match_extra("/emoji/custom/first_file.png")
+        |> to_string()
+
+      assert group == "list of files"
+    end
+
+    test "config with wildcard folder", %{groups: groups} do
+      group =
+        groups
+        |> Loader.match_extra("/emoji/custom/some_folder/file.png")
+        |> to_string()
+
+      assert group == "wildcard folder"
+    end
+
+    test "config with wildcard folder and subfolders", %{groups: groups} do
+      group =
+        groups
+        |> Loader.match_extra("/emoji/custom/some_folder/another_folder/file.png")
+        |> to_string()
+
+      assert group == "wildcard folder"
+    end
+
+    test "config with wildcard files", %{groups: groups} do
+      group =
+        groups
+        |> Loader.match_extra("/emoji/custom/folder/some_file.png")
+        |> to_string()
+
+      assert group == "wildcard files"
+    end
+
+    test "config with wildcard files and subfolders", %{groups: groups} do
+      group =
+        groups
+        |> Loader.match_extra("/emoji/custom/folder/another_folder/some_file.png")
+        |> to_string()
+
+      assert group == "wildcard files"
+    end
+
+    test "config for special file", %{groups: groups} do
+      group =
+        groups
+        |> Loader.match_extra("/emoji/custom/special.png")
+        |> to_string()
+
+      assert group == "special file"
+    end
+
+    test "no mathing returns nil", %{groups: groups} do
+      group =
+        groups
+        |> Loader.match_extra("/emoji/some_undefined.png")
+
+      refute group
+    end
+  end
+end