ephemeral storage quotas: add test updates

Author: pacoxu

keps/sig-node/1029-ephemeral-storage-quotas/README.md

@@ -24,7 +24,12 @@
       - [Future](#future)
     - [Notes on Implementation](#notes-on-implementation)
     - [Notes on Code Changes](#notes-on-code-changes)
+  - [Test Plan](#test-plan)
     - [Testing Strategy](#testing-strategy)
+      - [Prerequisite testing updates](#prerequisite-testing-updates)
+      - [Unit tests](#unit-tests)
+      - [Integration tests](#integration-tests)
+      - [e2e tests](#e2e-tests)
   - [Risks and Mitigations](#risks-and-mitigations)
 - [Graduation Criteria](#graduation-criteria)
   - [Phase 1: Alpha (1.15)](#phase-1-alpha-115)
@@ -569,6 +574,9 @@ required elsewhere:
   future allow adding additional data without having to change code
   other than that which uses the new information.
 
+### Test Plan
+
+
 #### Testing Strategy
 
 The quota code is by an large not very amendable to unit tests.  While
@@ -580,6 +588,40 @@ manager, particularly under stress).  It also requires setup in the
 form of a prepared filesystem.  It would be better served by
 appropriate end to end tests.
 
+[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.
+
+##### Prerequisite testing updates
+
+<!--
+Based on reviewers feedback describe what additional tests need to be added prior
+implementing this enhancement to ensure the enhancements have also solid foundations.
+-->
+
+##### Unit tests
+
+The main unit test is in package under `pkg/volume/util/fsquota/`.
+
+- `pkg/volume/util/fsquota/`: `2022-06-20` - `73%`
+- - project.go 75.7%
+- - quota.go 100%
+- - quota_linux.go 70.6%
+
+See details in https://testgrid.k8s.io/sig-testing-canaries#ci-kubernetes-coverage-unit&include-filter-by-regex=fsquota.
+
+##### Integration tests
+
+N/A
+
+##### e2e tests
+
+e2e evolution (LocalStorageCapacityIsolationQuotaMonitoring [Slow] [Serial] [Disruptive] [Feature:LocalStorageCapacityIsolationQuota][NodeFeature:LSCIQuotaMonitoring]) can be found in [`test/e2e_node/quota_lsci_test.go`](https://github.com/kubernetes/kubernetes/blob/8cd689e40d253e520b1698d4bcf33992f0ae1d20/test/e2e_node/quota_lsci_test.go#L93-L103)
+
+The e2e tests are slow and serial and we will not promote them to be conformance test then.
+There is no failure history or flakes in https://storage.googleapis.com/k8s-triage/index.html?test=LocalStorageCapacityIsolationQuotaMonitoring
+
+
 ### Risks and Mitigations
 
 * The SIG raised the possibility of a container being unable to exit