TESTA studies have recently been revived – after thirteen years of almost total silence - by Ann Harris, who in an excellent article offered new biographical facts, new material mostly on drawings, new suggestions for the dating of several works and implicitly for the whole chronology, a revision of the attributions of the previous literature, primarily Marabottini's article of 1954 – the last comprehensive study that had been published before her own article – in short a stimulating account of the present knowledge of Testa's life and work, a fresh start and new platform for further research. The long interval between her and Mara bottini's article had been interrupted only by the 1960 Ancona museum catalogue, where a Testa landscape (later mentioned by Harris) is illustrated and by Luigi Salerno's article on the Giustiniani inventory of 1639, which contains two entries regarding Testa, two pictures now at Potsdam, one of which, the important, relatively early Moses striking the rock, Salerno published in a photo whereas he made the other one known only through Landon's engraving.