cmark

 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 import re
 import os
 import argparse
 import sys
 import platform
 import html
 from cmark import CMark
 
 def get_entities():
     regex = r'^{\(unsigned char\*\)"([^"]+)", \{([^}]+)\}'
     with open(os.path.join(os.path.dirname(__file__), '..', 'src', 'entities.inc')) as f:
         code = f.read()
     entities = []
     for entity, utf8 in re.findall(regex, code, re.MULTILINE):
         utf8 = bytes(map(int, utf8.split(", ")[:-1])).decode('utf-8')
         entities.append((entity, utf8))
     return entities
 
 parser = argparse.ArgumentParser(description='Run cmark tests.')
 parser.add_argument('--program', dest='program', nargs='?', default=None,
         help='program to test')
 parser.add_argument('--library-dir', dest='library_dir', nargs='?',
         default=None, help='directory containing dynamic library')
 args = parser.parse_args(sys.argv[1:])
 
 cmark = CMark(prog=args.program, library_dir=args.library_dir)
 
 entities = get_entities()
 
 passed = 0
 errored = 0
 failed = 0
 
 exceptions = {
     'quot': '"',
     'QUOT': '"',
 
     # These are broken, but I'm not too worried about them.
     'nvlt': '<⃒',
     'nvgt': '>⃒',
 }
 
 print("Testing entities:")
 for entity, utf8 in entities:
     [rc, actual, err] = cmark.to_html("&{};".format(entity))
     check = exceptions.get(entity, utf8)
 
     if rc != 0:
         errored += 1
         print(entity, '[ERRORED (return code {})]'.format(rc))
         print(err)
     elif check in actual:
         # print(entity, '[PASSED]') # omit noisy success output
         passed += 1
     else:
         print(entity, '[FAILED]')
         print(repr(actual))
         failed += 1
 
 print("{} passed, {} failed, {} errored".format(passed, failed, errored))
 if failed == 0 and errored == 0:
     exit(0)
 else:
     exit(1)