'Prepares nr_clients test client mocks to be used.'

def SetupClients(self, nr_clients, system=None, os_version=None, arch=None):

    with client_index.CreateClientIndex(token=self.token) as index:
        client_ids = [self.SetupClient(client_nr, index, system, os_version, arch) for client_nr in xrange(nr_clients)]
    return client_ids
