code: def test_clear(self):
      uowcommit, a1, b1, a_mapper, b_mapper = self._fixture()
      pairs = [(a_mapper.c.id, b_mapper.c.t1id)]
      b1.obj().t1id = 8
      eq_(b1.obj().__dict__["t1id"], 8)
      sync.clear(b1, b_mapper, pairs)
      eq_(b1.obj().__dict__["t1id"], None)
  
imports: from sqlalchemy import ForeignKey
  from sqlalchemy import Integer
  from sqlalchemy import testing
  from sqlalchemy.orm import attributes
  from sqlalchemy.orm import class_mapper
  from sqlalchemy.orm import exc
  from sqlalchemy.orm import sync
  from sqlalchemy.orm import unitofwork
  from sqlalchemy.testing import assert_raises_message
  from sqlalchemy.testing import eq_
  from sqlalchemy.testing import fixtures
  from sqlalchemy.testing.fixtures import fixture_session
  from sqlalchemy.testing.schema import Column
  from sqlalchemy.testing.schema import Table
label_desc: Use image node_id 9 for calling the SyncTest obj's underlying member method code with example usage: obj.test_clear() without return types