Update test plan

Author: ravisantoshgudimetla

keps/sig-windows/2802-identify-windows-pods-apiserver-admission/README.md

@@ -20,6 +20,10 @@
   - [Changes to Kubelet](#changes-to-kubelet)
   - [Potential future changes to Scheduler](#potential-future-changes-to-scheduler)
   - [Test Plan](#test-plan)
+    - [Prerequisite testing updates](#prerequisite-testing-updates)
+      - [Unit tests](#unit-tests)
+      - [Integration tests](#integration-tests)
+      - [e2e tests](#e2e-tests)
   - [Graduation Criteria](#graduation-criteria)
     - [Alpha](#alpha)
     - [Alpha -> Beta Graduation](#alpha---beta-graduation)
@@ -186,7 +190,32 @@ express scheduling constraints. During the alpha, we assume there are no schedul
 - Unit tests covering API server defaulting to various fields within pod with and without this feature
 - Unit tests covering admission plugins which validate/mutate pod spec based on this feature
 - Unit and E2E tests for Kubelet changes.
-- Updates to the `sig-windows` tagged tests to utilize to direct windows scheduling for all pods .
+- Updates to the `sig-windows` tagged tests to utilize to direct windows scheduling for all pods.
+
+#### Prerequisite testing updates
+[x] I/we understand the owners of the involved components may require updates to existing tests to make this code solid enough prior to committing the changes necessary to implement this enhancement.
+
+##### Unit tests
+ 
+`k8s.io/kubernetes/pkg/apis/core/validation`: 	`06/03/2022`	`82.1% of statements`
+`k8s.io/kubernetes/pkg/apis/core/validation/validation.go:2979`:	`06/03/2022`:			`76.2% of statements`
+`k8s.io/kubernetes/pkg/apis/core/validation/validation.go:3488`:	`06/03/2022`:	  	`92.0% of statements`
+`k8s.io/kubernetes/pkg/apis/core/validation/validation.go:3573`:	`06/03/2022`:		  `100.0% of statements`
+`k8s.io/kubernetes/pkg/apis/core/validation/validation.go:3590`:	`06/03/2022`:			`65.3% of statements`
+`k8s.io/kubernetes/pkg/apis/core/validation/validation.go:6360`:	`06/03/2022`:		  `100.0% of statements`
+
+##### Integration tests
+
+The pod security standard integration tests will be updated to include OS specific validations.
+
+
+##### e2e tests
+
+There are e2e tests which 
+- validate that the kubelet rejects the pod which have os field not matching the underlying OS
+- validate that the kubelet reconciles and corrects if the node's OS label is changed
+
+
 ### Graduation Criteria
 
 #### Alpha