Ada Conformity Assessment Test Suite
The Ada Conformity Assessment Test Suite is the test suite used for Ada processor conformity testing.
The preface to the test report includes the following:
The second paragraph of the background of the current says:
The ACATS consists of 1821 tests with 255,838 lines of code occupying 30 MB of storage. The test suite is publicly available, for example as a part of the source distribution of the GNU Compiler Collection, which also contains the Ada compiler GNAT.