code: def main():
      # load io tests
      with warnings.catch_warnings():
          warnings.simplefilter("ignore")
          suite_io = unittest.TestSuite()
          suite_io.addTests(
              unittest.TestLoader().loadTestsFromTestCase(
                  io_.TestIOFacilities
              )
          )
          suite_io.addTests(
              unittest.TestLoader().loadTestsFromTestCase(
                  io_.TestMetadataConsistency
              )
          )
  
          # execute tests
          unittest.TextTestRunner(verbosity=2).run(suite_io)
  
imports: import warnings
  import unittest
  import io_
label_desc: Use image node_id 1 for calling a global function with example usage: main() without return types