code: def test_lazy_function():
      module_name = "xmlrpc.client"
      function_name = "gzip_decode"
      lazy = lazy_function(module_name, function_name)
      assert lazy(b"") == b""
      assert module_name in sys.modules
      assert function_name in str(lazy)
      repr_lazy = repr(lazy)
      assert "LazyFunction" in repr_lazy
      assert function_name in repr_lazy
  
      lazy = lazy_function("sympy.core.cache", "cheap")
  
file_path: sympy/sympy/core/tests/test_cache.py
imports: import sys
  from sympy.core.cache import cacheit, cached_property, lazy_function
  from sympy.testing.pytest import raises
label_desc: Use image node_id 5 for calling a global function with example usage: test_lazy_function() without return types