Attached you can find a diff with the correction of Bug 3057.
With the latest changes to display some information in GP some Feature Tests stopped working when run against a GP instance.
Also we found out that the Feature Test(PGDataType) against 9.2 is failing for some time as well.
Some Unit tests were not working when running with Python Version 3.5 due to missing functions in the Mocking Library.
This patch solves all the problems above.
I notice that datatype_test.json adds a field for "datatypes_minimum_versions" (maybe should be datatype_minimum_versions?), whilst the code is checking the server version is greater than that value. Should the comparison be >=, or is the name misleading?