code: def test_check_format_non_est():
      """[Utils] _check_format: test non-est instance does not pass."""
  
      instances = (("ols-1", dict()), ("ols-2", OLS(offset=1)))
      assert not _check_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 5 for calling a global function with example usage: test_check_format_non_est() without return types