code: def test_errors(self):
      # Test SyntaxErrors:
      for stmt in ("x,", "x, y", "x = y", "pass", "import sys"):
          compile(stmt, "test", "exec")  # Sanity check.
          with self.assertRaises(SyntaxError):
              compile(f"@{stmt}\ndef f(): pass", "test", "exec")
  
      # Test TypeErrors that used to be SyntaxErrors:
      for expr in (
          "1.+2j",
          "[1, 2][-1]",
          "(1, 2)",
          "True",
          "...",
          "None",
      ):
          compile(expr, "test", "eval")  # Sanity check.
          with self.assertRaises(TypeError):
              exec(f"@{expr}\ndef f(): pass")
  
      def unimp(func):
          raise NotImplementedError
  
      context = dict(nullval=None, unimp=unimp)
  
      for expr, exc in [
          ("undef", NameError),
          ("nullval", TypeError),
          ("nullval.attr", AttributeError),
          ("unimp", NotImplementedError),
      ]:
          codestr = "@%s\ndef f(): pass\nassert f() is None" % expr
          code = compile(codestr, "test", "exec")
          self.assertRaises(exc, eval, code, context)
  
imports: import unittest
  from types import MethodType
label_desc: Use image node_id 9 for calling the TestDecorators obj's underlying member method code with example usage: obj.test_errors() without return types