code: def test_decimal(self):
      self.assertEqual(self.db.decimal("A", None), None)
      self.assertEqual(self.db.decimal("9"), 9)
      self.assertEqual(self.db.decimal("\u215b", None), None)
      self.assertEqual(self.db.decimal("\u2468", None), None)
      self.assertEqual(self.db.decimal("\U00020000", None), None)
      self.assertEqual(self.db.decimal("\U0001D7FD"), 7)
  
      self.assertRaises(TypeError, self.db.decimal)
      self.assertRaises(TypeError, self.db.decimal, "xx")
      self.assertRaises(ValueError, self.db.decimal, "x")
  
imports: import hashlib
  from http.client import HTTPException
  import sys
  import unicodedata
  import unittest
  from test.support import open_urlresource, requires_resource, script_helper, cpython_only, check_disallow_instantiation
label_desc: Use image node_id 7 for calling the UnicodeFunctionsTest obj's underlying member method code with example usage: obj.test_decimal() without return types