Add tests for fallback routes

test/web/fallback_test.exs

+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.FallbackTest do
+  use Pleroma.Web.ConnCase
+  import Pleroma.Factory
+
+  test "GET /registration/:token", %{conn: conn} do
+    assert conn
+           |> get("/registration/foo")
+           |> html_response(200) =~ "<!--server-generated-meta-->"
+  end
+
+  test "GET /:maybe_nickname_or_id", %{conn: conn} do
+    user = insert(:user)
+
+    assert conn
+           |> get("/foo")
+           |> html_response(200) =~ "<!--server-generated-meta-->"
+
+    refute conn
+           |> get("/" <> user.nickname)
+           |> html_response(200) =~ "<!--server-generated-meta-->"
+  end
+
+  test "GET /*path", %{conn: conn} do
+    assert conn
+           |> get("/foo")
+           |> html_response(200) =~ "<!--server-generated-meta-->"
+
+    assert conn
+           |> get("/foo/bar")
+           |> html_response(200) =~ "<!--server-generated-meta-->"
+  end
+
+  test "OPTIONS /*path", %{conn: conn} do
+    assert conn
+           |> options("/foo")
+           |> response(204) == ""
+
+    assert conn
+           |> options("/foo/bar")
+           |> response(204) == ""
+  end
+end