test(robot): add storageclass for different replica count

[chriscchien]

Which issue(s) this PR fixes:

Issue longhorn/longhorn#8440

What this PR does / why we need it:

Create 1 replica storageclass longhorn-test-1-replica and 2 replicas storageclass longhorn-test-2-replicas at test step for PVC use

Special notes for your reviewer:

Local test code

*** Test Cases ***
Replica Test
    Given Create persistentvolumeclaim 0 using RWO volume
    And Create persistentvolumeclaim 1 using RWO volume with 1-replica storageclass
    And Create persistentvolumeclaim 2 using RWO volume with 2-replicas storageclass

    And Create deployment 0 with persistentvolumeclaim 0
    And Create deployment 1 with persistentvolumeclaim 1
    And Create deployment 2 with persistentvolumeclaim 2

Additional documentation or context

report.zip

[yangchiu]

Eventually we will pass arbitrary parameters to customize storage class to meet test cases requirements, like fromBackup, migratable, dataLocality, backingImageName and so on (you can reference https://longhorn.io/docs/1.6.1/references/storage-class-parameters/ to see all parameters). Is it possible to modify the mechanism to dynamically create custom storage class on demand (before you create the PVC) and destroy it when the test case completed?

[yangchiu]

Is it possible to adopt this mechanism https://github.com/longhorn/longhorn-tests/pull/1867/files#diff-6422ed87ee022691c861ebd060f6651dd79d25bef034662a78dc201f40a8838bR14 to make storage class accept arbitrary option settings instead of hard-coding it?

So the corresponding test step would be:

And Create persistentvolumeclaim 1 using RWO volume with    replica_count=1

[chriscchien]

Updated:

• Add keywords for create storageclass with name and params for PVC use, below test code will create storageclass longhorn-test-test-storageclass (longhorn-test and longhorn-test-strict-local storageclass still auto created at test stepup steps)

• Test code

*** Test Cases ***
Storageclass Test
    Given Create storageclass test-storageclass with    replica_count=2    migratable=true
    
    And Create persistentvolumeclaim 0 using RWO volume
    And Create persistentvolumeclaim 1 using RWX volume
    And Create persistentvolumeclaim 2 using RWO volume with strict-local storageclass
    And Create persistentvolumeclaim 3 using RWO volume with test-storageclass storageclass

    And Create deployment 0 with persistentvolumeclaim 0
    And Create deployment 1 with persistentvolumeclaim 1
    And Create deployment 2 with persistentvolumeclaim 2
    And Create deployment 3 with persistentvolumeclaim 3

• storageclass longhorn-test-test-storageclass

> k get storageclass longhorn-test-test-storageclass -o yaml | grep param -A4
parameters:
  migratable: "true"
  numberOfReplicas: "2"
  staleReplicaTimeout: "30"
provisioner: driver.longhorn.io

report.zip

[yangchiu]

LGTM