[tests/conftest.py]: new API runcmd_interactive.

[praveen-li]

Changes:
-- new API runcmd_interactive to execute a command in interactive mode.
Usage: Say in a Test, we want to run "config save" and want to pass
confirmation later.

Signed-off-by: Praveen Chaudhary pchaudhary@linkedin.com

What I did
Changes:
-- new API runcmd_interactive to execute a command in interactive mode.
Usage: Say in a Test, we want to run "config save" and want to pass
confirmation later.

Why I did it
Need such command for tests like below:

                exitCode, child = self.dvs.runcmd_interactive('config save')
                # -- AcquireLock.
                child.settimeout(3)
                out = str(child.recv(RECV_SIZE))
                assert 'continue' in out
                # -- send No
                child.send("N"+"\n")
                out = str(child.recv(RECV_SIZE))
                assert 'Aborted' in out
                child.close()

How I verified it
Wrote test which uses it, for lock in configDB. These tests are not pushed in Azure but we need interactive command to run better tests anyways.

~/praveen/sonic-swss/tests$ sudo pytest --pdb --dvsname=vs-jk test_config_lock.py --junitxml=report.xml
============================================================ test session starts ============================================================
platform linux2 -- Python 2.7.17, pytest-3.3.0, py-1.8.0, pluggy-0.6.0
rootdir: /home/falco/praveen/sonic-swss/tests, inifile:
collected 5 items

test_config_lock.py .....                                                                                                             [100%]

------------------------------------ generated xml file: /home/falco/praveen/sonic-swss/tests/report.xml ------------------------------------
======================================================== 5 passed in 108.65 seconds =========================================================

Details if related

[praveen-li]

retest vs please

[praveen-li]

@lguohan kindly review. This API to run command in interactive mode will be useful for tests. Thx.

-- new API runcmd_interactive to execute a command in interactive mode.
Usage: Say in a Test, we want to run "config save" and want to pass
confirmation later.

[praveen-li]

/AzurePipelines run

[azure-pipelines]

Commenter does not have sufficient privileges for PR 1424 in repo Azure/sonic-swss

[praveen-li]

@jleveque : How can I run only 'Azure.sonic-swss'. thx