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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.Web.FallbackTest do
+  use Pleroma.Web.ConnCase
+  import Pleroma.Factory
+
+  describe "neither preloaded data nor metadata attached to" do
+    test "GET /registration/:token", %{conn: conn} do
+      response = get(conn, "/registration/foo")
+
+      assert html_response(response, 200) =~ "<!--server-generated-meta-->"
+    end
+
+    test "GET /*path", %{conn: conn} do
+      assert conn
+             |> get("/foo")
+             |> html_response(200) =~ "<!--server-generated-meta-->"
+    end
+  end
+
+  test "GET /*path adds a title", %{conn: conn} do
+    clear_config([:instance, :name], "a cool title")
+
+    assert conn
+           |> get("/")
+           |> html_response(200) =~ "<title>a cool title</title>"
+  end
+
+  describe "preloaded data and metadata attached to" do
+    test "GET /:maybe_nickname_or_id", %{conn: conn} do
+      clear_config([:instance, :name], "a cool title")
+
+      user = insert(:user)
+      user_missing = get(conn, "/foo")
+      user_present = get(conn, "/#{user.nickname}")
+
+      assert html_response(user_missing, 200) =~ "<!--server-generated-meta-->"
+      refute html_response(user_present, 200) =~ "<!--server-generated-meta-->"
+      assert html_response(user_present, 200) =~ "initial-results"
+      assert html_response(user_present, 200) =~ "<title>a cool title</title>"
+    end
+
+    test "GET /*path", %{conn: conn} do
+      assert conn
+             |> get("/foo")
+             |> html_response(200) =~ "<!--server-generated-meta-->"
+
+      refute conn
+             |> get("/foo/bar")
+             |> html_response(200) =~ "<!--server-generated-meta-->"
+    end
+  end
+
+  describe "preloaded data is attached to" do
+    test "GET /main/public", %{conn: conn} do
+      clear_config([:instance, :name], "a cool title")
+
+      public_page = get(conn, "/main/public")
+
+      refute html_response(public_page, 200) =~ "<!--server-generated-meta-->"
+      assert html_response(public_page, 200) =~ "initial-results"
+      assert html_response(public_page, 200) =~ "<title>a cool title</title>"
+    end
+
+    test "GET /main/all", %{conn: conn} do
+      public_page = get(conn, "/main/all")
+
+      refute html_response(public_page, 200) =~ "<!--server-generated-meta-->"
+      assert html_response(public_page, 200) =~ "initial-results"
+    end
+  end
+
+  test "GET /api*path", %{conn: conn} do
+    assert conn
+           |> get("/api/foo")
+           |> json_response(404) == %{"error" => "Not implemented"}
+  end
+
+  test "GET /pleroma/admin -> /pleroma/admin/", %{conn: conn} do
+    assert redirected_to(get(conn, "/pleroma/admin")) =~ "/pleroma/admin/"
+  end
+
+  test "OPTIONS /*path", %{conn: conn} do
+    assert conn
+           |> options("/foo")
+           |> response(204) == ""
+
+    assert conn
+           |> options("/foo/bar")
+           |> response(204) == ""
+  end
+end