'Verify the pretty-printing of sets'

def test_sets(self):

    self.assertGdbRepr(set())
    self.assertGdbRepr(set(['a', 'b']))
    self.assertGdbRepr(set([4, 5, 6]))
    (gdb_repr, gdb_output) = self.get_gdb_repr("s    =    set(['a','b'])\ns.pop()\nprint    s")
    self.assertEqual(gdb_repr, "set(['b'])")
