test: extend tests to cover the new operator behavior

Author: raggi

test/tailscale/tailscale_operator.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+# Copyright (c) 2025 Tailscale Inc & AUTHORS All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+set -e
+
+source dev-container-features-test-lib
+
+check "operator flag is set" bash -c "pgrep -f '\--operator=$(id -un)' | grep tailscaled"
+
+reportResults

test/tailscale/tailscale_operator.sh

@@ -13,4 +13,6 @@ if [[ -n "$VERSION" ]]; then
     check "version is correct" bash -c "tailscale version --daemon | grep -q $VERSION"
 fi
 
-reportResults
+check "operator flag is not set" bash -c "! pgrep -f '--operator=$(id -un)'"
+
+reportResults