SBFileSpec.fullpath always uses the forward slash to join the directory with the base name. This causes mismatches when comparing Windows paths with backslashes in two of the minidump tests. To get around that we just compare the directory names separately from the filenames.
Thanks for getting back to this. I think this is a good workaround for the problem (maybe it would be good to make a note of that in the comment). The fullpath implementation should be fixed use the correct path separator, but I haven't yet figured out a good way to do it -- it will probably involve reimplementing fullpath on top of GetPath and fiddling with swig typemaps so that GetPath is usable from python...