sensu_go_check - idempotent cron checks

[jaredledvina]

To help with #124, this adds a test that should fail if there's a bug w/ the idempotent nature of cron style checks.

Opening for TravisCI to run, I expect that this will fail and will work to resolve that on this branch as well.

Signed-off-by: Jared Ledvina jared@techsmix.net

[jaredledvina]

Alright, so there is a bug, this failure https://travis-ci.com/jaredledvina/sensu-go-ansible/jobs/209275428#L1132 confirms that.

I think this is because the Sensu Go API is returning 0 instead of null for interval when a check is cron check is configured.

[jaredledvina]

Yep....

Existing check w/ interval:

❯ sensuctl check info check_test
=== check_test
Name:              check_test
Interval:          30
Command:           /bin/true
Cron:
Timeout:           0
TTL:               0
Subscriptions:     all
Handlers:
Runtime Assets:
Hooks:
Publish?:          true
Stdin?:            false
Proxy Entity Name:
Namespace:         default
Metric Format:
Metric Handlers:

Configure it as a cron based check:

❯ sensuctl check set-cron check_test '* * * * *'
Updated

Interval is now reset to 0 versus being nil:

❯ sensuctl check info check_test
=== check_test
Name:              check_test
Interval:          0
Command:           /bin/true
Cron:              * * * * *
Timeout:           0
TTL:               0
Subscriptions:     all
Handlers:
Runtime Assets:
Hooks:
Publish?:          true
Stdin?:            false
Proxy Entity Name:
Namespace:         default
Metric Format:
Metric Handlers:

Latest change should work and make the tests pass.