The query appears to expect a type error because the input to the function is
not a QName. In fact, however, the input to the function is an empty sequence,
because the path expression $input-context/Folder selects nothing (the top level
element of the fsx source file is called Drivel).

also affects

NamespaceURIFromQNameFunc015

Note: with tests that use a schema, it's a shame that such errors aren't caught
by type checking. They could be if the type of the $input-context variable were
declared.