ZODB is used by the database_cremona optional spkg. Thus a way to test this package is to install that optional package, then do:

sage: EllipticCurve("30001a1")
Elliptic Curve defined by y^2 + y = x^3 + x^2 - 171*x - 6408 over Rational Field
sage: CremonaDatabase().largest_conductor()
130000

and not get an error. Just that is enough to show that the ZODB is doing pretty much all we use it for in Sage. Running the test suite for ZODB is unfortunately not possible :-(.

Also, be sure to test the "devel/sage/sage/databases" directory, and you of course should do "make test" in SAGE_ROOT to test the whole library.