async def METHOD_NAME(self):
    ui = utilities.make_ui()
    envelope = Envelope()
    envelope['To'] = 'ambig@example.com, test@example.com'
    await utils.update_keys(ui, envelope)
    self.assertTrue(envelope.encrypt)
    self.assertCountEqual(
        [f.fpr for f in envelope.encrypt_keys.values()],
        [crypto.get_key(FPR).fpr, crypto.get_key(EXTRA_FPRS[0]).fpr])