Any plan based on tests are just a fantasy, at least for now. Because the tests you are talking about (at the airport) don't exist, 2 days in advance barely exists (and not in the quantity required), it doesn't handle return flights, and it isn't even supported by science. Here is the press release, from a few minutes ago, from the WHO:

The World Health Organization (WHO) said on Saturday that there was currently “no evidence” that people who have recovered from COVID-19 and have antibodies are protected from a second coronavirus infection.

In a scientific brief, the United Nations agency warned governments against issuing “immunity passports” or “risk-free certificates” to people who have been infected as their accuracy could not be guaranteed.

The practice could actually increase the risks of continued spread as people who have recovered may ignore advice about taking standard precautions against the virus, it said.