# Testing importing of built-in submodules


import test.test_support, unittest
import sys

class BuiltinSubmoduleImportTest(unittest.TestCase):

  def test_import(self):
    self.assertIn("xxsubtype.xxsubmoduletest", sys.builtin_module_names)
    import xxsubtype.xxsubmoduletest
    import xxsubtype.xxsubmoduletest as a
    from xxsubtype import xxsubmoduletest as b
    self.assertIs(xxsubtype.xxsubmoduletest, a)
    self.assertIs(xxsubtype.xxsubmoduletest, b)
    self.assertIn(sys.modules, "xxsubtype")
    self.assertIn(sys.modules, "xxsubtype.xxsubmoduletest")
    self.assertEqual(sys.modules["xxsubtype"], xxsubtype)
    self.assertEqual(sys.modules["xxsubtype.xxsubmoduletest"], xxsubtype.xxsubmoduletest)
    self.assertTrue(hasattr(xxsubtype, "__path__"))

def test_main():
    test.test_support.run_unittest(BuiltinSubmoduleImportTest)

if __name__ == "__main__":
    test_main()