Unit tests extended with a new check for source locations.
Currently a simple match check in the node text dumps is done.
The new check is disabled for now, until the failures are fixed.
This test will work theoretically only if the order of every imported Decl (and not only FieldDecl) is correct, this is not the case now. So probably a better solution for the problem should be found: Enumerate and match (the From and To) SourceLocations with AST visitor. There should be some existing code that is doing somewhat similar in clang-query but I did not find it.