DISPATCH-1455: assertRaises and mutually_exclusive groups not working as expected in rhel6

[nicob87]

just to open the discussion, this is one way to fix it.

• mutually_exclusive_groups, not working as expected in python2.6, so manually
  adding the functionality only for python_version < 2.7.
• assertRaises also works different in python2.6, it expects more arguments.

[nicob87]

in rhel6 this is gonna fail because the error message is not exactly like this:

if "error: argument --all-entities: not allowed with argument -c/--connections" in str(e):                             

probably it will bit more like:

"error: argument --all-entities: not allowed with argument -c"

[kgiusti]

I would simply skip the test if python is 2.6. Would that be easier?

import sys

Then in the test
if sys.version_info[0] == 2 and sys.version_info[1] < 7:
self.skipTest("requires python >= 2.7")

taa daa!!!

[ganeshmurthy]

Instead of skipping the test, we could test for the Python version and check for the appropriate message.

[ganeshmurthy]

I have opened a JIRA to address this - https://issues.apache.org/jira/browse/DISPATCH-1455

[nicob87]

Good! ok, based on the feedback, probably I will open a new PR with a different approach, just skipping, and/or testing the expected different behaviour and then we can compare and see what solution we like more.
PR linked with the Jira.

[ganeshmurthy]

Good! ok, based on the feedback, probably I will open a new PR with a different approach, just skipping, and/or testing the expected different behaviour and then we can compare and see what solution we like more.
PR linked with the Jira.

Excellent. Yes, please close this PR and open a new one with what you said above. Thanks Nicolas.

[codecov-io]

Codecov Report

Merging #596 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #596      +/-   ##
==========================================
- Coverage   86.36%   86.36%   -0.01%     
==========================================
  Files          90       90              
  Lines       20484    20485       +1     
==========================================
  Hits        17691    17691              
- Misses       2793     2794       +1

Impacted Files	Coverage Δ
src/router_core/agent_link.c	66.83% <0%> (-0.51%)	⬇️
src/iterator.c	89.17% <0%> (-0.17%)	⬇️
src/router_node.c	92.9% <0%> (-0.13%)	⬇️
src/message.c	90.99% <0%> (-0.1%)	⬇️
src/router_core/transfer.c	94.51% <0%> (+0.74%)	⬆️

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