[config] Add unit tests for 'config interface breakout' command

[praveen-li]

Test Plan:

Consideration for sonic utilities breakout config tests: 

-- create a breakout config file,  
-- mock load_configMgmt() to return specially constructed configMgmtDPB instance. 
-- Device info get_ path*__file function should return default file so it should be mocked. 
-- config db must have breakout config table. 
-- mock get child ports to return interfaces, if needed.
-- mock shut down interfaces, if needed.

*Test Plan:* 

*>>> Test _get_ breakout options()* 
-- create a file breakout config. This can be a PY test fixture. 
-- mock device information part to return breakout file. 
-- pass argument incomplete as below and observe the results: 
  a.) 1x1 b.) 4x c.) 2x d.) Wrong interface. 

*>> Test Verbose Args:* 
Pass verbose as args, and observe that loadConfigMgmt is called with verbose. 

 *>> Test breakout_extra_table_warning Args:* 
Test breakout_extra_table_warning for breakout port. 
Add unknown_table to config with port which will be broken out 
Observe: Warning and ask User confirmation for the tables WithOut Yang models. 

*>>> Test Negative case: 
Test negative case of breakout port. Such as: 
Wrong Interface, wrong option and Wrong breakout Mode for DPB Command. 

*>>> Test below Config Breakout commands:* 

       [Mock loadConfigMgmt and device info part for all below tests] 
       [Load a fixed config in Data Tree, i.e. may not be same as configDB from mockTables] 
       [Replace the configDB.json with test config if needed. Or correct configDB then use it. Also replace it at the end with original Config] 
       [Note: we are testing only main.py part not config_mgmt.py] 
       [Observe point for all below will be: a.) Click.echo part and b.) Update to BRK_CFG table in in-memory DB] 

        # Ethernet8: start from 4x25G-->2x50G with -f -l 
           sudo config interface breakout Ethernet8 2x50G -f -l 

         # Ethernet8: move from 2x50G-->1x100G without force, list deps 
           sudo config interface breakout Ethernet8 1x100G[40G] -f -l 

        # Ethernet8: move from 2x50G-->1x100G with force, where deps exists 
           sudo config interface breakout Ethernet8 1x100G[40G] -f  

        # Ethernet8: move from 1x100G-->4x25G without force, no deps 
           sudo config interface breakout Ethernet8 4x25G 

        # Ethernet8: move from 4x25G-->1x100G with force, no deps 
           sudo config interface breakout Ethernet8 1x100G -f 

        # Ethernet8: move from 1x100G-->1x50G(2)+2x25G(2) with -f -l, 
           sudo config interface breakout Ethernet8 1x50G(2)+2x25G(2)  -f -l 

        # Ethernet4: breakout from 4x25G to 2x50G with -f -l 
           sudo config interface breakout Ethernet4 2x50G  -f -l 

Signed-off-by: Praveen Chaudharypchaudhary@linkedin.com

- What I did
Sonic Utils test for 'config interface breakout' command.

- How I did it
As per test plan above.

- How to verify it

tests/aclshow_test.py ...........                                        [  5%]
tests/bgp_commands_test.py ...                                           [  6%]
tests/config_dpb_test.py .....                                           [  8%]
tests/config_mgmt_test.py ....                                           [ 10%]
tests/config_test.py ..                                                  [ 10%]
tests/console_test.py ............................................       [ 26%]

.......
.......
utilities_common/constants.py                  8      0   100%
utilities_common/db.py                        12      2    83%
utilities_common/intf_filter.py               30     18    40%
utilities_common/multi_asic.py                70      7    90%
utilities_common/netstat.py                   37     11    70%
utilities_common/util_base.py                 32     32     0%
watchdogutil/__init__.py                       0      0   100%
watchdogutil/main.py                          54     54     0%
--------------------------------------------------------------
TOTAL                                      15461   9532    38%
Coverage HTML written to dir htmlcov
Coverage XML written to file coverage.xml


========================= 276 passed in 115.19 seconds =========================
pchaudha@df0493b4ca14:/sonic/src/sonic-utilities$ exit
exit

- Previous command output (if the output of a command-line utility has changed)

- New command output (if the output of a command-line utility has changed)

[lguohan]

5860 is not going to be approved. please add natsorted in your test.

[praveen-li]

5860 is not going to be approved. please add natsorted in your test.

@lguohan
Adding natsort in test will not help, because sonic-cfggen is using it in sort_data(), which must be changed. Any ways, a call to sort_data() was not necessary in my tests, so I removed it. All checks r good now.

[praveen-li]

@lguohan: This PR is up for review now, i.e not dependent on other PR. Thanks.

[praveen-li]

retest default please

[praveen-li]

retest this please

[zhenggen-xu]

Retest this please

[praveen-li]

Doing some force pushes to fix a issue seen with PY3, do not mind.

[praveen-li]

@jleveque and @lguohan : I had to try couple of PY3 fix, so did force push.

Now I see that new tests are always passing, but there are console_test.py failures, which are not related to my changes. I will rerun my tests once console_test.py is solved. Thx.
.

16:31:49  tests/config_dpb_test.py .....                                           [  9%]<<<<<< New Test
16:31:49  tests/config_mgmt_test.py ....                                           [ 10%]
16:31:49  tests/config_test.py ..                                                  [ 10%]
16:31:50  tests/console_test.py ...............................................F.. [ 25%]

[praveen-li]

retest this please

[praveen-li]

retest this please

[praveen-li]

retest this please

[praveen-li]

retest this please

[praveen-li]

retest this please

[praveen-li]

@jleveque and @lguohan : I had to try couple of PY3 fix, so did force push.

Now I see that new tests are always passing, but there are console_test.py failures, which are not related to my changes. I will rerun my tests once console_test.py is solved. Thx.
.

16:31:49  tests/config_dpb_test.py .....                                           [  9%]<<<<<< New Test
16:31:49  tests/config_mgmt_test.py ....                                           [ 10%]
16:31:49  tests/config_test.py ..                                                  [ 10%]
16:31:50  tests/console_test.py ...............................................F.. [ 25%]

@jleveque and @lguohan

I realized that, I was adding below line on teardown() of my test class, which makes console_test fail. Resolve it.

os.environ["PATH"] = os.pathsep.join(os.environ["PATH"].split(os.pathsep)[:-1])

[jleveque]

I realized that, I was adding below line on teardown() of my test class, which makes console_test fail. Resolve it.

os.environ["PATH"] = os.pathsep.join(os.environ["PATH"].split(os.pathsep)[:-1])

Aha. Yes, I found and fixed other tests recently which were doing the same thing in the teardown function but not appending to the PATH in the setup function, thus breaking the PATH. 👍

[praveen-li]

@jleveque
This PR adds only new tests, not much change in Dev Code, it will be great if we can review and merge this one. Because for any future PR we want these config breakout tests to execute. Thx.