human
Solve the following python programming problem given the following code:
@ mock.patch ('paramiko.client.SSHClient') 
@ unittest.skipIf ((not paramiko_installed), 'paramiko not installed') 
def test_execute_command(self, ssh_client_cls) : 
    host = 'localhost' 
    cmd = 'ls' 
    ssh = SSHEntity (host) 
    ssh._ssh_cls = ssh_client_cls 
    session_mock = mock.Mock () 
    session_mock.recv_ready.return_value = True 
    session_mock.exit_status_ready.return_value = True 
    session_mock.recv.return_value = 'dummy' 
    stream_mock = mock.Mock () 
    stream_mock.channel = session_mock 
    ssh.ssh_client.exec_command.return_value = (None, stream_mock, None) 
    def change_status(y) : 
        session_mock.recv_ready.return_value = False 
        return 'dummy' 
session_mock.recv.side_effect = change_status 
    ssh.get_new_session = (lambda : session_mock) 
    ssh.execute_command (cmd) 
    ssh.ssh_client.exec_command.assert_called_once_with (stream_mock) 
    self.assertTrue ((session_mock.recv.call_count >= 1)) 

    
    

    Fix the buggy line: ssh.ssh_client.exec_command.assert_called_once_with (stream_mock)
assistant
#Here is Python code to fix the buggy line: ssh.

ssh.ssh_client.exec_command.assert_called_once_with (cmd)