chess/test/chess_web/controllers/api/game_controller_test.exs

defmodule Chess.ApiGameControllerTest do
  use ChessWeb.ConnCase

  alias Chess.Auth.Guardian

  import Chess.Factory,
    only: [create_user: 0, create_user: 2, create_game_for: 2]

  test "shows chosen game", %{conn: conn} do
    user = create_user()
    opponent = create_user("revali", "vahmedoh")
    game = create_game_for(user, opponent)

    conn =
      conn
      |> login(user)
      |> get(api_game_path(conn, :show, game))

    assert json_response(conn, 200)
  end

  test "does not show a game if the user is not a player", %{conn: conn} do
    user = create_user()
    opponent = create_user("revali", "vahmedoh")
    game = create_game_for(user, opponent)

    other_user = create_user("mipha", "ilovelink")

    conn =
      conn
      |> login(other_user)

    assert_error_sent 404, fn ->
      get conn, api_game_path(conn, :show, game.id)
    end
  end

  test "responds with 403 if user is not logged in", %{conn: conn} do
    user = create_user()
    opponent = create_user("revali", "vahmedoh")
    game = create_game_for(user, opponent)

    conn =
      conn
      |> get(api_game_path(conn, :show, game.id))

    assert json_response(conn, 403)
  end

  test "renders page not found when id is nonexistent", %{conn: conn} do
    user = create_user()
    conn = login(conn, user)

    assert_error_sent 404, fn ->
      get conn, api_game_path(conn, :show, -1)
    end
  end

  defp login(conn, user) do
    conn
    |> Guardian.Plug.sign_in(user)
  end
end