class_docstr: Test deadlock and serialization failure errors.
class_docstr_tok: ["Test","deadlock","and","serialization","failure","errors","."]
code: def tearDown(self):
      curs = self.conn.cursor()
      curs.execute("DROP TABLE table1")
      curs.execute("DROP TABLE table2")
      self.conn.commit()
  
      ConnectingTestCase.tearDown(self)
  
imports: import threading
  import unittest
  from .testutils import ConnectingTestCase, skip_before_postgres, slow
  from .testutils import skip_if_crdb
  import psycopg2
  from psycopg2.extensions import ISOLATION_LEVEL_SERIALIZABLE, STATUS_BEGIN, STATUS_READY
label_desc: Use image node_id 3 for calling the DeadlockSerializationTests obj's underlying member method code with example usage: obj.tearDown() without return types