code: def test_check_time_series_err():
      """Checks exceptions"""
      ts = UnivariateTimeSeries()
      with pytest.raises(RuntimeError, match="Must load data"):
          ts.describe_time_col()
  
      with pytest.raises(RuntimeError, match="Must load data"):
          ts.describe_value_col()
  
      with pytest.raises(RuntimeError, match="Must load data"):
          ts.make_future_dataframe()
  
imports: import datetime
  from datetime import datetime
  import numpy
  import pandas
  import pytest
  from pandas.testing import assert_frame_equal
  from greykite.common.constants import ADJUSTMENT_DELTA_COL
  from greykite.common.constants import END_TIME_COL
  from greykite.common.constants import METRIC_COL
  from greykite.common.constants import START_TIME_COL
  from greykite.common.constants import TIME_COL
  from greykite.common.constants import VALUE_COL
  from greykite.common.python_utils import assert_equal
  from greykite.common.testing_utils import generate_df_for_tests
  from greykite.common.testing_utils import generate_df_with_reg_for_tests
  from greykite.common.time_properties import get_canonical_data
  from greykite.common.viz.timeseries_plotting import add_groupby_column
  from greykite.framework.benchmark.data_loader_ts import DataLoaderTS
  from greykite.framework.constants import MEAN_COL_GROUP
  from greykite.framework.constants import OVERLAY_COL_GROUP
  from greykite.framework.constants import QUANTILE_COL_GROUP
  from greykite.framework.input.univariate_time_series import UnivariateTimeSeries
label_desc: Use image node_id 5 for calling a global function with example usage: test_check_time_series_err() without return types