code: def generate_testcases():
      """Generate test cases for drivers that support date fields, convert date fields to string or do not support
      date fields"""
      _test_cases_datefield = []
      _test_cases_datefield_to_str = []
      _test_cases_datefield_not_supported = []
  
      for field_type in ["time", "datetime", "date"]:
          # Select only driver that are capable of writing fields
          for driver, raw in supported_drivers.items():
              if _driver_supports_mode(driver, "w"):
                  if _driver_supports_field(driver, field_type):
                      if _driver_converts_field_type_silently_to_str(
                          driver, field_type
                      ):
                          _test_cases_datefield_to_str.append(
                              (driver, field_type)
                          )
                      else:
                          _test_cases_datefield.append(
                              (driver, field_type)
                          )
                  else:
                      _test_cases_datefield_not_supported.append(
                          (driver, field_type)
                      )
  
      return (
          _test_cases_datefield,
          _test_cases_datefield_to_str,
          _test_cases_datefield_not_supported,
      )
  
imports: import fiona
  from fiona._env import get_gdal_version_num, calc_gdal_version_num
  import pytest
  from fiona.errors import DriverSupportError
  from fiona.rfc3339 import parse_time, parse_datetime
  from .conftest import get_temp_filename
  from fiona.env import GDALVersion
  from fiona.model import Feature
  import datetime
  from fiona.drvsupport import supported_drivers, driver_mode_mingdal, _driver_converts_field_type_silently_to_str, _driver_supports_field, _driver_converts_to_str, _driver_supports_timezones, _driver_supports_milliseconds, _driver_supports_mode
  import pytz
  from pytz import timezone
label_desc: Use image node_id 13 for calling a global function with example usage: generate_testcases() and returns: _test_cases_datefield,  _test_cases_datefield_to_str,  _test_cases_datefield_not_supported