Comment 1 for bug 681047

There is a quite suspicious:

class TransportTests(TestTransportImplementation):

    def setUp(self):
        super(TransportTests, self).setUp()
        self._captureVar('BZR_NO_SMART_VFS', None)

    def check_transport_contents(self, content, transport, relpath):
        """Check that transport.get(relpath).read() == content."""
        self.assertEqualDiff(content, transport.get(relpath).read())

We'd better use get_bytes() there instead of get()...