Check whether at least one of the keys in implied_keys
        is in ``parameters``,
        when a given ``key=value`` is present in ``parameters``,
        for some value in values.
        Log messages into ``self.result``.

        :param dict parameters: the given parameters

def _check_implied_parameters(self, parameters):
        """
        Check whether at least one of the keys in implied_keys
        is in ``parameters``,
        when a given ``key=value`` is present in ``parameters``,
        for some value in values.
        Log messages into ``self.result``.

        :param dict parameters: the given parameters
        """
        for key, values, implied_keys in self.IMPLIED_PARAMETERS:
            self.log([u"Checking implied parameters by '%s'='%s'", key, values])
            if (key in parameters) and (parameters[key] in values):
                found = False
                for implied_key in implied_keys:
                    if implied_key in parameters:
                        found = True
                if not found:
                    if len(implied_keys) == 1:
                        msg = u"Parameter '%s' is required when '%s'='%s'." % (implied_keys[0], key, parameters[key])
                    else:
                        msg = u"At least one of [%s] is required when '%s'='%s'." % (",".join(implied_keys), key, parameters[key])
                    self._failed(msg)
                    return
        self.log(u"Passed")