code: def test_copy_no_column_limit(self):
      cols = [f"c{i:050}" for i in range(200)]
  
      curs = self.conn.cursor()
      curs.execute(
          "CREATE TEMPORARY TABLE manycols (%s)"
          % ",\n".join(["%s int" % c for c in cols])
      )
      curs.execute("INSERT INTO manycols DEFAULT VALUES")
  
      f = StringIO()
      curs.copy_to(f, "manycols", columns=cols)
      f.seek(0)
      self.assertEqual(f.read().split(), ["\\N"] * len(cols))
  
      f.seek(0)
      curs.copy_from(f, "manycols", columns=cols)
      curs.execute("select count(*) from manycols;")
      self.assertEqual(curs.fetchone()[0], 2)
  
imports: import io
  import sys
  import string
  import unittest
  from .testutils import ConnectingTestCase, skip_before_postgres, slow, StringIO
  from .testutils import skip_if_crdb
  from itertools import cycle
  from subprocess import Popen, PIPE
  import psycopg2
  import psycopg2.extensions
  from .testutils import skip_copy_if_green, TextIOBase
  from .testconfig import dsn
label_desc: Use image node_id 14 for calling the CopyTests obj's underlying member method code with example usage: obj.test_copy_no_column_limit() without return types