We have this Hungarian phrase "Állatorvosi ló", which literally translates to "Veterinarian horse".
It originated in 19th century Hungarian literature, when someone created an illustration of a horse that exhibited all the possible external and internal sicknesses a horse can have.
Nowadays it is used to describe all the possible (negative) conditions something can have.
In our concrete case, we're doing software testing for a CAT (Computer Aided Translation) software that has a QA module; and we're going to build a special project (the 'vetenarian horse') that exhibits all the possible errors the QA module can throw at us.
What would be an idiomatic word or phrase to express that?