code: def test_package(self):
      name = "__phello__"
      module, output = self.exec_module(name)
      check = {"__name__": name}
      for attr, value in check.items():
          attr_value = getattr(module, attr)
          self.assertEqual(
              attr_value,
              value,
              "for {name}.{attr}, {given!r} != {expected!r}".format(
                  name=name, attr=attr, given=attr_value, expected=value
              ),
          )
      self.assertEqual(output, "Hello world!\n")
      self.assertEqual(module.__spec__.loader_state.origname, name)
  
imports: from test.test_importlib import abc, util
  from test.support import captured_stdout, import_helper, STDLIB_DIR
  import contextlib
  import os.path
  import types
  import unittest
  import warnings
label_desc: Use image node_id 3 for calling the ExecModuleTests obj's underlying member method code with example usage: obj.test_package() without return types