Close files in the module_loading tests always.

    def find_module(self, fullname, path=None):

        tail = fullname.rsplit('.', 1)[-1]

        try:

            self._cache[fullname] = imp.find_module(tail, path)

            fd, fn, info = imp.find_module(tail, path)

            if fullname in self._cache:

                old_fd = self._cache[fullname][0]

                if old_fd:

                    old_fd.close()

            self._cache[fullname] = (fd, fn, info)

        except ImportError:

            return None

        else:

        if fullname in sys.modules:

            return sys.modules[fullname]

        fd, fn, info = self._cache[fullname]

        try:

            return imp.load_module(fullname, fd, fn, info)

        finally:

            if fd:

                fd.close()

class TestFinder(object):

    def __init__(self, *args, **kwargs):