code: def test_check_events_warnings_null_duration():
      """Test that events with null duration throw a warning."""
      with pytest.warns(
          UserWarning,
          match="The following conditions contain events with null duration",
      ):
          check_events(design_with_null_durations())
  
file_path: nilearn/nilearn/glm/tests/test_paradigm.py
imports: import os
  import numpy
  import pandas
  import pytest
  from numpy.testing import assert_array_equal
  from nilearn._utils.data_gen import basic_paradigm
  from nilearn.glm.first_level.experimental_paradigm import check_events, handle_modulation_of_duplicate_events
  from ._testing import block_paradigm, design_with_nan_durations, design_with_nan_onsets, design_with_null_durations, duplicate_events_paradigm, modulated_block_paradigm, modulated_event_paradigm
label_desc: Use image node_id 6 for calling a global function with example usage: test_check_events_warnings_null_duration() without return types