code: def testLazyLoader(self):
      self.assertEmpty(
          [m for m in sys.modules if "lazy_test_submodule" in m]
      )
  
      self.assertEqual(["lazy_test_submodule"], l.__all__)
      self.assertEqual(["lazy_test_submodule"], dir(l))
  
      # The submodule should be imported only after it is accessed.
      self.assertEmpty(
          [m for m in sys.modules if "lazy_test_submodule" in m]
      )
      self.assertEqual(42, l.lazy_test_submodule.a_function())
      self.assertLen(
          [m for m in sys.modules if "lazy_test_submodule" in m], 1
      )
  
imports: import sys
  from absl.testing import absltest
  from jax._src import test_util
  from jax._src.internal_test_util import lazy_loader_module
label_desc: Use image node_id 1 for calling the LazyLoaderTest obj's underlying member method code with example usage: obj.testLazyLoader() without return types