fcl-db: test: when testing unidirectional bufdataset set UniDirectional after (not before) test data are populated and saved to file (before any test), because setting unidirectional before prevents inserting test data at all.
Of course this change does not help very much, because when data are loaded from file bidirectional is checked and exception is raised.
So IMO we should comment: //UniDirectional := TestUniDirectional, because in concept of save/load file we can not test unidirectional bufdataset.

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@23640 3ad0048d-3df7-0310-abae-a5850022a9f2