def test_sysfind_multiple(self):

       dir = py.test.ensuretemp('sysfind') 

       env = py.std.os.environ

       oldpath = env['PATH']

       try:

           env['PATH'] += ":%s:%s" % (dir.ensure('a'),

                                      dir.join('b'))

           dir.ensure('b', 'a')

           checker = lambda x: x.dirpath().basename == 'b'

           x = py.path.local.sysfind('a', checker=checker)

           assert x.basename == 'a'

           assert x.dirpath().basename == 'b'

           checker = lambda x: None

->         assert py.path.local.sysfind('a', checker=checker) is None

       finally:

           env['PATH'] = oldpath