Drivers:
PostgreSQL ANSI(x64) 9.05.04.00, PostgreSQL Global Development Group PSQLODBC30A.DLL (7/30/2016).
EnterpriseDB (ANSI) 9.03.400.02, EnterpriseDB EDB-ODBCA.DLL (1/20/2016).
I notice that if I change the driver used for the EDB database to the PostgreSQL ANSI driver, then it is recognized as a PostgreSQL database and the test appears to complete properly.
Ed