Add better workaround for blocking QDialogs. Add unreadable file test and reinstate tor connection killed test

tests/local_onionshare_share_mode_unreadable_file_test.py

@@ -0,0 +1,22 @@
+#!/usr/bin/env python3
+import unittest
+
+from .GuiShareTest import GuiShareTest
+
+class LocalShareModeUnReadableFileTest(unittest.TestCase, GuiShareTest):
+    @classmethod
+    def setUpClass(cls):
+        test_settings = {
+        }
+        cls.gui = GuiShareTest.set_up(test_settings, 'LocalShareModeUnReadableFileTest')
+
+    @classmethod
+    def tearDownClass(cls):
+        GuiShareTest.tear_down()
+
+    def test_gui(self):
+        self.run_all_common_setup_tests()
+        self.run_all_share_mode_unreadable_file_tests()
+
+if __name__ == "__main__":
+    unittest.main()