as_deps_example/apps/hello_world_web/test/hello_world_web/controllers/page_controller_test.exs

defmodule HelloWorldWeb.PageControllerTest do
  use HelloWorldWeb.ConnCase

  test "GET /", %{conn: conn} do
    conn = get(conn, "/")
    assert html_response(conn, 200) =~ "Welcome to Phoenix!"
  end
end