code: def test_error(self):
      cur = self.conn.cursor()
      cur.execute("insert into table1 values (%s)", (1,))
      self.wait(cur)
      cur.execute("insert into table1 values (%s)", (1,))
      # this should fail
      self.assertRaises(psycopg2.IntegrityError, self.wait, cur)
      cur.execute(
          "insert into table1 values (%s); "
          "insert into table1 values (%s)",
          (2, 2),
      )
      # this should fail as well (Postgres behaviour)
      self.assertRaises(psycopg2.IntegrityError, self.wait, cur)
      # but this should work
      cur.execute("insert into table1 values (%s)", (2,))
      self.wait(cur)
      # and the cursor should be usable afterwards
      cur.execute("insert into table1 values (%s)", (3,))
      self.wait(cur)
      cur.execute("select * from table1 order by id")
      self.wait(cur)
      self.assertEquals(cur.fetchall(), [(1,), (2,), (3,)])
      cur.execute("delete from table1")
      self.wait(cur)
  
imports: import gc
  import time
  import unittest
  import warnings
  import psycopg2
  import psycopg2.errors
  from psycopg2 import extensions
  from .testutils import ConnectingTestCase, StringIO, skip_before_postgres, skip_if_crdb, crdb_version, slow
label_desc: Use image node_id 24 for calling the AsyncTests obj's underlying member method code with example usage: obj.test_error() without return types