test: verify independent guests and recovery on private displays

tests/test_profiles.py

@@ -33,6 +33,11 @@ class ProfilesTests(unittest.TestCase):
                 with self.subTest(field=field, value=value), self.assertRaises(ValueError):
                     Profile('guest', self.iso, **{field: value})
 
+    def test_invalid_media_path_types(self):
+        for iso in (True, 42, ''):
+            with self.subTest(iso=iso), self.assertRaises(ValueError):
+                Profile('guest', iso)
+
     def test_duplicate_profile_preserves_existing(self):
         dest = self.root / 'guest.toml'
         save_profile(dest, Profile('guest', self.iso))

tests/test_session.py

@@ -82,7 +82,8 @@ class SessionTests(unittest.TestCase):
             self.assertEqual(main(base + ['view', 'alpha']), 1)
         self.assertIn('viewer', error.getvalue().lower())
 
-    def test_windowed_viewer_exit_leaves_vm_control_untouched(self):
+    def test_windowed_viewer_exit_with_missing_iso_leaves_vm_control_untouched(self):
+        self.iso.unlink()
         viewer = self.root / 'fake-viewer'
         viewer.write_text('#!/bin/sh\ncase "$1" in --help) echo --hide-toolbar; exit 0;; esac\nexit 7\n')
         viewer.chmod(0o700)