diff --git a/napalm_tplink_jetstream/tplink_jetstream.py b/napalm_tplink_jetstream/tplink_jetstream.py
index 1336b2b..402ab8a 100644
--- a/napalm_tplink_jetstream/tplink_jetstream.py
+++ b/napalm_tplink_jetstream/tplink_jetstream.py
@@ -18,6 +18,7 @@ Netmiko device_type: ``tplink_jetstream``
 
 from __future__ import annotations
 
+import logging
 import re
 from typing import Any, ClassVar
 
@@ -38,6 +39,11 @@ from napalm_device_types.ssh_host_keys import HostKeyCheck, SshHostKeyMismatch
 from netmiko import ConnectHandler
 from netmiko.exceptions import NetmikoAuthenticationException, NetmikoTimeoutException
 
+logger = logging.getLogger(__name__)
+
+#: get_users' password field: the switch never shows a password, so it stays empty.
+_PASSWORD_NOT_SHOWN = ""  # nosec B105
+
 
 class TPLinkJetstreamDriver(ConfigLifecycleMixin, SnmpAgentMixin, SwitchDriver):
     """NAPALM driver for TP-Link Jetstream managed switches."""
@@ -372,7 +378,7 @@ class TPLinkJetstreamDriver(ConfigLifecycleMixin, SnmpAgentMixin, SwitchDriver):
 
             Port     State   Speed  Duplex  FlowCtrl  Description
             Gi1/0/1  Enable  Auto   Auto    Disable   uplink
-        """
+        """  # noqa: E501 - recorded device output keeps its lines
         jumbo_out = self._send_command("show jumbo")
         global_mtu = 1518
         m = re.search(r"(\d+)", jumbo_out)
@@ -446,7 +452,7 @@ class TPLinkJetstreamDriver(ConfigLifecycleMixin, SnmpAgentMixin, SwitchDriver):
             )
             if not match:
                 continue
-            port, status, speed, duplex, _, _, _, _, description = (
+            port, status, speed, _duplex, _, _, _, _, description = (
                 match.group(1),
                 match.group(2),
                 match.group(3),
@@ -703,7 +709,7 @@ class TPLinkJetstreamDriver(ConfigLifecycleMixin, SnmpAgentMixin, SwitchDriver):
             Port      Device ID               Port ID   management address  Port Description  System Name
             ----      ------------            --------  ------------------  ----------------  -----------
             Gi1/0/9   64:E8:81:E1:29:00       2         10.7.0.10           2                 swt-l0-1-10
-        """
+        """  # noqa: E501 - recorded device output keeps its lines
         neighbors: dict[str, list[dict]] = {}
         for row in self._get_lldp_table():
             neighbors.setdefault(row["local_port"], []).append(
@@ -1026,7 +1032,7 @@ class TPLinkJetstreamDriver(ConfigLifecycleMixin, SnmpAgentMixin, SwitchDriver):
 
     @staticmethod
     def _to_cli_interface(port: str) -> str:
-        """Convert abbreviated port name (e.g. ``Gi1/0/1``) to CLI form (``gigabitEthernet 1/0/1``)."""
+        """Convert a short port name (``Gi1/0/1``) to CLI form (``gigabitEthernet 1/0/1``)."""
         _PREFIX_MAP = {
             "gi": "gigabitEthernet",
             "te": "ten-gigabitEthernet",
@@ -1150,7 +1156,8 @@ class TPLinkJetstreamDriver(ConfigLifecycleMixin, SnmpAgentMixin, SwitchDriver):
         """
         if self._backup_config is None:
             raise CommandErrorException(
-                "No backup configuration available – commit_config has not been called in this session."
+                "No backup configuration available – "
+                "commit_config has not been called in this session."
             )
 
         current = self._send_command("show running-config")
@@ -1423,7 +1430,7 @@ class TPLinkJetstreamDriver(ConfigLifecycleMixin, SnmpAgentMixin, SwitchDriver):
             # Map TP-Link roles to NAPALM privilege levels (1-15)
             level = 15 if role == "admin" else 1
 
-            users[username] = {"level": level, "password": "", "sshkeys": []}
+            users[username] = {"level": level, "password": _PASSWORD_NOT_SHOWN, "sshkeys": []}
 
         return users
 
@@ -1618,7 +1625,7 @@ class TPLinkJetstreamDriver(ConfigLifecycleMixin, SnmpAgentMixin, SwitchDriver):
                     if interface in vlan_info.get("untagged", []) and vid_str != new_vid:
                         old_untagged_vlans.append(vid_str)
             except Exception:
-                pass
+                logger.debug("reading the old untagged VLANs: ignored", exc_info=True)
 
         self._enter_config_mode()
         try:
diff --git a/tests/unit/test_driver.py b/tests/unit/test_driver.py
index b794051..5294fa8 100644
--- a/tests/unit/test_driver.py
+++ b/tests/unit/test_driver.py
@@ -96,7 +96,7 @@ class TestGetFacts:
 
         # _get_interface_list needs show interface
         driver.device.send_command.side_effect = lambda cmd, **kw: (
-            SHOW_SYSTEM_INFO if "system-info" in cmd else SHOW_INTERFACE
+            SHOW_SYSTEM_INFO if "system-info" in cmd else SHOW_INTERFACE_STATUS
         )
 
         facts = driver.get_facts()
diff --git a/tests/unit/test_ssh_host_key.py b/tests/unit/test_ssh_host_key.py
index 5298e3f..4cbcea6 100644
--- a/tests/unit/test_ssh_host_key.py
+++ b/tests/unit/test_ssh_host_key.py
@@ -76,7 +76,7 @@ def test_a_changed_key_is_refused():
         try:
             raise paramiko.BadHostKeyException("10.0.0.8", SERVER_KEY, OTHER_KEY)
         except paramiko.SSHException as exc:  # what netmiko does with it
-            raise NetmikoTimeoutException(f"A paramiko SSHException occurred: {exc}")
+            raise NetmikoTimeoutException(f"A paramiko SSHException occurred: {exc}") from exc
 
     driver = _driver(seen, SshHostKey.of(OTHER_KEY))
     with patch(HANDLER, side_effect=refuse):