Federico Razzoli started to develop STK/Unit in 2010, because he wanted to have a Unit Test for MySQL Stored Routines - and later, more generally, he wanted to test other parts of his databases. Since then, Federico always used it to test the work he did for his customers. So, we think that STK/Unit is a reliable tool.
At the end of 2012, when Giacomo and Federico started to work on STK, they decided that STK/Unit would be an important part of the project.
On 16th March 2013, first Release Candidate was released. That date is also Richard Stallman's birthday!