[GCU] Adding unit-test where path and ref paths are under the same YANG container

[ghooo]

What I did

Did a debug session with Ping Mao and found this case is failing in her PR: sonic-net/sonic-buildimage#9545 I think it is an interesting case and I added it explicitly to GCU.

Adding unit-test where path and ref paths are under the same YANG container

sonic-loopback-interface.yang has:

    container sonic-loopback-interface {
        container LOOPBACK_INTERFACE {
            list LOOPBACK_INTERFACE_LIST {
                ...
                leaf name{
                    type string;
                }
                ...
            list LOOPBACK_INTERFACE_IPPREFIX_LIST {
                leaf name{
                    ...
                    type leafref {
                        path "../../LOOPBACK_INTERFACE_LIST/name";
                    }
                }
               ...

How I did it

Unit-test added

How to verify it

unit-test

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)

[qiluo-msft]

~1

To improve readability regarding the ~1 escape, we con construct the paths from components.

eg: https://github.com/Azure/sonic-mgmt/blob/d23d893a40e898fb3aeb70abd3bd60d08492b484/tests/generic_config_updater/gu_utils.py#L244 #Closed

[ghooo]

updated

[ghooo]

/azp run

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