The TDML runner gathers up sax errors onto a loadingExceptions list.
This list is only displayed if the TDML file is deemed invalid, which requires that the sax exception was reported as an error, not just as a warning.
Even if the TDML is deemed valid, warnings should be output.
In test_unqualifiedPathStepPolicy_defaultNamespace_test_01 a warning is being suppressed that should say:
Couple things though. First, that exception is because of an xsi:schemaLocation attribute on the daf:dfdlConfig element in the config file tunables.xml.
That particular error is spurious. It should be finding and properly resolving. That's a separate ticket DAFFODIL-2339.
But, for purposes of this ticket, this exception is on the loadingExceptions list and is suppressed entirely.