code: def test_weak_references(self, prefix_loader):
      self.compile_down(prefix_loader)
      self.mod_env.get_template("a/test.html")
      key = loaders.ModuleLoader.get_template_key("a/test.html")
      name = self.mod_env.loader.module.__name__
  
      assert hasattr(self.mod_env.loader.module, key)
      assert name in sys.modules
  
      # unset all, ensure the module is gone from sys.modules
      self.mod_env = None
  
      try:
          import gc
  
          gc.collect()
      except BaseException:
          pass
  
      assert name not in sys.modules
  
imports: import os
  import shutil
  import sys
  import tempfile
  import time
  import weakref
  import pytest
  from jinja2 import Environment
  from jinja2 import loaders
  from jinja2._compat import PY2
  from jinja2._compat import PYPY
  from jinja2.exceptions import TemplateNotFound
  from jinja2.loaders import split_template_path
  import yatest.common
label_desc: Use image node_id 8 for calling the TestModuleLoader obj's underlying member method code with example usage: obj.test_weak_references(prefix_loader) without return types