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diff --git a/test/pleroma/web/o_auth/app_test.exs b/test/pleroma/web/o_auth/app_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.OAuth.AppTest do
+  use Pleroma.DataCase
+
+  alias Pleroma.Web.OAuth.App
+  import Pleroma.Factory
+
+  describe "get_or_make/2" do
+    test "gets exist app" do
+      attrs = %{client_name: "Mastodon-Local", redirect_uris: "."}
+      app = insert(:oauth_app, Map.merge(attrs, %{scopes: ["read", "write"]}))
+      {:ok, %App{} = exist_app} = App.get_or_make(attrs, [])
+      assert exist_app == app
+    end
+
+    test "make app" do
+      attrs = %{client_name: "Mastodon-Local", redirect_uris: "."}
+      {:ok, %App{} = app} = App.get_or_make(attrs, ["write"])
+      assert app.scopes == ["write"]
+    end
+
+    test "gets exist app and updates scopes" do
+      attrs = %{client_name: "Mastodon-Local", redirect_uris: "."}
+      app = insert(:oauth_app, Map.merge(attrs, %{scopes: ["read", "write"]}))
+      {:ok, %App{} = exist_app} = App.get_or_make(attrs, ["read", "write", "follow", "push"])
+      assert exist_app.id == app.id
+      assert exist_app.scopes == ["read", "write", "follow", "push"]
+    end
+
+    test "has unique client_id" do
+      insert(:oauth_app, client_name: "", redirect_uris: "", client_id: "boop")
+
+      error =
+        catch_error(insert(:oauth_app, client_name: "", redirect_uris: "", client_id: "boop"))
+
+      assert %Ecto.ConstraintError{} = error
+      assert error.constraint == "apps_client_id_index"
+      assert error.type == :unique
+    end
+  end
+end