def METHOD_NAME(no_check=(), extra=(), skip_func=None, py_main=None):
    """
    tests all bundled modules are importable
    just add
    "PEERDIR(library/python/import_test)" to your CMakeLists.txt and
    "from import_test import test_imports" to your python test source file.
    """
    if not isinstance(b'', str):
        def str_(s):
            return s.decode('UTF-8')
    else:
        def str_(s):
            return s
    exceptions = list(no_check)
    for key, _ in __res.iter_keys(b'py/no_check_imports/'):
        exceptions += str_(__res.find(key)).split()
    if exceptions:
        exceptions.sort()
        print('NO_CHECK_IMPORTS', ' '.join(exceptions))
    # all test modules get imported when tests are run
    exceptions.append('__tests__.*')
    patterns = [re.escape(s).replace(r'\*', r'.*') for s in exceptions]
    rx = re.compile('^({})$'.format('|'.join(patterns)))
    failed = []
    import_times = {}
    def norm(s):
        return (s[:-9] if s.endswith('.__init__') else s)
    modules = sys.extra_modules | set(extra)
    modules = sorted(modules, key=norm)
    if py_main:
        modules = [py_main] + modules
    for module in modules:
        if module not in extra and (rx.search(module) or skip_func and skip_func(module)):
            print('SKIP', module)
            continue
        name = module.rsplit('.', 1)[-1]
        if name == '__main__' and 'if __name__ ==' not in importer.get_source(module):
            print('SKIP', module, '''without "if __name__ == '__main__'" check''')
            continue
        def print_backtrace_marked(e):
            tb_exc = traceback.format_exception(*e)
            for item in tb_exc:
                for line in item.splitlines():
                    print('FAIL:', line, file=sys.stderr)
        try:
            print('TRY', module)
            # XXX waiting for py3 to use print(..., flush=True)
            sys.stdout.flush()
            s = time.time()
            with warnings.catch_warnings():
                warnings.filterwarnings(action="ignore", category=DeprecationWarning)
                if module == '__main__':
                    importer.load_module('__main__', '__main__py')
                elif module.endswith('.__init__'):
                    __import__(module[:-len('.__init__')])
                else:
                    __import__(module)
            delay = time.time() - s
            import_times[str(module)] = delay
            print('OK ', module, '{:.3f}s'.format(delay))
        except Exception as e:
            print('FAIL:', module, e, file=sys.stderr)
            print_backtrace_marked(sys.exc_info())
            failed.append('{}: {}'.format(module, e))
        except BaseException:
            e = sys.exc_info()
            print('FAIL:', module, e, file=sys.stderr)
            print_backtrace_marked(e)
            failed.append('{}: {}'.format(module, e))
            raise
    print("Slowest imports:")
    for m, t in sorted(import_times.items(), key=lambda x: x[1], reverse=True)[:30]:
        print('  ', '{:.3f}s'.format(t), m)
    if failed:
        raise ImportError('modules not imported:\n' + '\n'.join(failed))