'this test did fail when the escaping wasnt strict'

def test_assertion_binchars(self, testdir):

    testdir.makepyfile("\n\n                                                M1    =    '\x01\x02\x03\x04'\n                                                M2    =    '\x01\x02\x03\x05'\n\n                                                def    test_str_compare():\n                                                                assert    M1    ==    M2\n                                                ")
    (result, dom) = runandparse(testdir)
    print(dom.toxml())
