test(sandbox): add NFS kernel extraArgs integration test

tests/integration/core/sandbox/test_extra_args.py

@@ -52,6 +52,35 @@ async def test_creates_sandbox_with_nvme_enabled(self):
         finally:
             await SandboxInstance.delete(name)
 
+    async def test_creates_sandbox_with_nfs_enabled(self):
+        """Test creating a sandbox with nfs extra arg.
+
+        Skips gracefully if the controlplane hasn't deployed nfs support yet.
+        """
+        name = unique_name("extra-args-nfs")
+        created = False
+        try:
+            await SandboxInstance.create(
+                {
+                    "name": name,
+                    "image": default_image,
+                    "extra_args": {"nfs": "enabled"},
+                    "labels": default_labels,
+                }
+            )
+            created = True
+
+            retrieved = await SandboxInstance.get(name)
+            assert retrieved.spec.runtime.extra_args is not None
+            assert retrieved.spec.runtime.extra_args["nfs"] == "enabled"
+        except Exception as e:
+            if 'unsupported extraArgs key "nfs"' in str(e):
+                pytest.skip("controlplane hasn't deployed nfs support yet")
+            raise
+        finally:
+            if created:
+                await SandboxInstance.delete(name)
+
     async def test_creates_sandbox_with_both_iptables_and_nvme(self):
         """Test creating a sandbox with both iptables and nvme enabled."""
         name = unique_name("extra-args-both")