code: def test_assert_format_list_bad():
      """[Utils] _assert_format: test correct list passes."""
      instances = [("ols-1", OLS()), OLS(offset=1)]
      assert not _assert_format(instances)
  
file_path: mlens/mlens/utils/tests/test_formatting.py
imports: from mlens.utils.dummy import OLS
  from mlens.utils.formatting import _check_format, _assert_format, _format_instances, _check_instances
label_desc: Use image node_id 8 for calling a global function with example usage: test_assert_format_list_bad() without return types