added comments in vm_pvc_expansion

Signed-off-by: AYUSH-D-PATNI <[email protected]>

tests/functional/workloads/cnv/test_vm_pvc_expansion.py

@@ -13,36 +13,42 @@
 @workloads
 class TestVmPvcExpansion(E2ETest):
     """
-    Independently expands the PVC attached to the VM
-    Test Steps:
-    1. Create VM PVC following the documented procedure
-        from ODF official docs.
-    2. Get initial PVC size and generate checksum before resize
-    3. Resize PVC (increase by 1-5 GiB)
-    4. Get new PVC size and generate checksum after resize
-    5. Verify resize and data integrity
+    Test PVC expansion for a CNV VM workload
     """
 
+    @workloads
     def test_pvc_expansion(self, cnv_workload):
         """
-        Test PVC expansion for a CNV VM workload.
+        Independently expands the PVC attached to the VM
+        Test Steps:
+        1. Create VM PVC following the documented procedure
+            from ODF official docs.
+        2. Get initial PVC size and generate checksum before resize
+        3. Resize PVC (increase by 1-5 GiB)
+        4. Get new PVC size and generate checksum after resize
+        5. Verify resize and data integrity
         """
+        # Create VM and attach PVC
         vm_obj = cnv_workload(
             volume_interface=constants.VM_VOLUME_PVC,
             source_url=constants.CNV_FEDORA_SOURCE,
         )[-1]
         vm_pvc_obj = vm_obj.get_vm_pvc_obj()
         log.info(f"Initial PVC size: {vm_pvc_obj.size} GiB")
+        # Generate checksum before resize
         file_path = "/source_file.txt"
         source_csum = run_dd_io(vm_obj=vm_obj, file_path=file_path, verify=True)
         log.info(f"Checksum before resize: {source_csum}")
+        # Resize PVC by 1-5 GiB
         new_size = random.randint(vm_pvc_obj.size + 1, vm_pvc_obj.size + 5)
         log.info(f"Resizing PVC to {new_size} GiB")
         vm_pvc_obj.resize_pvc(new_size, True)
+        # Verify new size and checksum after resize
         vm_pvc_obj_n = vm_obj.get_vm_pvc_obj()
         log.info(f"New PVC size: {vm_pvc_obj_n.size} GiB")
         res_csum = cal_md5sum_vm(vm_obj=vm_obj, file_path=file_path)
         log.info(f"Checksum after resize: {res_csum}")
+        # Check data integrity and PVC size
         assert source_csum == res_csum and vm_pvc_obj_n.size == new_size, (
             f"Failed: PVC expansion or MD5 mismatch for VM '{vm_obj.name}'. "
             f"Expected size: {new_size} GiB, but got: {vm_pvc_obj.size} GiB."