new_contents: import unittest
  import sys
  from ctypeslib import h2xml, xml2py
  
  class ToolchainTest(unittest.TestCase):
      if sys.platform == "win32":
          def test(self):
              h2xml.main(["h2xml", "-q",
                          "-D WIN32_LEAN_AND_MEAN",
                          "-D _UNICODE", "-D UNICODE",
                          "-c", "windows.h",
                          "-o", "_windows_gen.xml"])
              xml2py.main(["xml2py", "_windows_gen.xml", "-w", "-o", "_winapi_gen.py"])
              import _winapi_gen
  
  if __name__ == "__main__":
      import unittest
      unittest.main()
  
subject: Test the complete h2xml and xml2py toolchain on Windows by running it over 'windows.h'.