1. A method comprising: automatically testing, by a computer test system, a latest version of software under test and one or more previous versions of the software, results of the automatic testing being generated using a data feed identical to both the latest version of software under test and to the one or more previous versions of the software, the one or more previous versions of software having been positively tested before the present automatic testing; comparing, using a predetermined criterion, the results of the automatic testing of the latest version of the software under test with further results of the automatic testing of the one or more previous versions of the software; and determining whether the latest version of software under test is positively tested based on said comparison.