code: def test_load_hourly_parking_ts():
      dl = DataLoaderTS()
      ts = dl.load_parking_ts(system_code_number=None)
      assert ts.original_time_col == "LastUpdated"
      assert ts.original_value_col == "OccupancyRatio"
      assert ts.freq == "30min"
      assert ts.df.shape == (3666, 4)
  
      ts = dl.load_parking_ts(system_code_number="NIA South")
      assert ts.original_time_col == "LastUpdated"
      assert ts.original_value_col == "OccupancyRatio"
      assert ts.freq == "30min"
      assert ts.df.shape == (3522, 5)
  
file_path: greykite/greykite/tests/framework/benchmark/test_data_loader_ts.py
imports: import pytest
  from greykite.common.constants import TIME_COL
  from greykite.common.constants import VALUE_COL
  from greykite.common.python_utils import assert_equal
  from greykite.framework.benchmark.data_loader_ts import DataLoaderTS
label_desc: Use image node_id 3 for calling a global function with example usage: test_load_hourly_parking_ts() without return types