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Six pytest unit tests covering the five review scenarios. All subprocess and filesystem side-effects are mocked so the tests run without root, hardware, or a Pi OS environment. 1. test_nmcli_ap_profile_has_no_security_params — asserts the nmcli connection add command has no key-mgmt / psk / WPA arguments and sets mode=ap. 2. test_iptables_nat_rules_added_on_ap_start — verifies _setup_iptables_redirect emits a PREROUTING REDIRECT 80→5000 rule and an INPUT ACCEPT rule for port 5000 (not 80, which never hits INPUT after PREROUTING rewrites it). 3. test_iptables_rules_and_ip_forward_reverted_on_teardown — verifies the -D PREROUTING/-D INPUT calls and that sysctl restores the saved ip_forward value and removes the save file. 4. test_ip_forward_not_restored_when_save_file_absent — verifies teardown skips sysctl when the save file was never written, preventing blind ip_forward=0 on systems using ip_forward for VPNs or NM shared mode. 5. test_led_message_shows_ssid_no_password_and_url — asserts the LED message includes the SSID, 'No password', and the 192.168.4.1:5000 setup URL. 6. test_existing_ap_profiles_deleted_before_new_profile_created — asserts all known profile names are targeted for deletion before 'nmcli connection add'. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>