client: use subprocess.communicate() to shut down server process This allows us to get stderr output with no deadlock risk. Also, it should fix possible deadlock issue at server.wait(). https://docs.python.org/2.7/library/subprocess.html#subprocess.Popen.wait

from tests import common
import hglib
from hglib.util import b

class test_encoding(common.basetest):
    def test_basic(self):
        self.client = hglib.open(encoding='utf-8')
        self.assertEquals(self.client.encoding, b('utf-8'))