end
function App.run_tests()
  local sorted_names = {}
  for name,binding in pairs(_G) do
    if name:find('test_') == 1 then
      table.insert(sorted_names, name)
    end
  end
  table.sort(sorted_names)
  for _,name in ipairs(sorted_names) do
    App.initialize_for_test()
--?     print('=== '..name)
--?     _G[name]()
    xpcall(_G[name], function(err) prepend_debug_info_to_test_failure(name, err) end)
  end
  -- clean up all test methods
  for _,name in ipairs(sorted_names) do
    _G[name] = nil
  end