feat: reboot_host (0.5.0)

HostRebootMixin's reboot_host over the command channel: reboot detached
and two seconds late, so the answer comes back before the session goes
down, and a refusal is raised instead of being mistaken for the dropped
session. netOrk sent /sbin/reboot through the private _send_command and
could not tell the two apart (netOrk #1113). A login other than root is
refused before anything runs.

tests/unit/test_command_channel.py

@@ -77,3 +77,33 @@ def test_no_warnings_of_its_own():
         for c in OpenWrtDriver.__mro__
         if c.__module__.startswith("napalm_openwrt")
     )
+
+
+class TestRebootHost:
+    """``reboot_host`` (napalm-device-types ``HostRebootMixin``): netOrk sent
+    ``/sbin/reboot`` through the private ``_send_command`` and could not tell a
+    refusal from the session dropping (netOrk #1113)."""
+
+    def test_detached_so_the_answer_comes_back_first(self):
+        drv = _driver()
+        with patch("napalm_openwrt.openwrt.run_on_transport", return_value=CommandResult("", "", 0)) as run:
+            drv.reboot_host()
+
+        command = run.call_args.args[1]
+        assert "reboot" in command and command.rstrip().endswith("&'")
+        assert "trap" in command and "sleep" in command
+
+    def test_a_refusal_is_raised(self):
+        drv = _driver()
+        failed = CommandResult("", "reboot: Operation not permitted", 1)
+        with patch("napalm_openwrt.openwrt.run_on_transport", return_value=failed), pytest.raises(
+            RuntimeError, match="not permitted"
+        ):
+            drv.reboot_host()
+
+    def test_a_login_other_than_root_is_refused(self):
+        drv = _driver(username="admin")
+        with patch("napalm_openwrt.openwrt.run_on_transport") as run, pytest.raises(RuntimeError):
+            drv.reboot_host()
+
+        run.assert_not_called()