Test and PEP8 fixes

tests/functional/openlp_core/test_threading.py

@@ -133,15 +133,11 @@ def test_get_thread_worker_mising(MockRegistry):
     # GIVEN: A mocked thread worker
     MockRegistry.return_value.get.return_value.worker_threads = {}
 
-    try:
-        # WHEN: get_thread_worker() is called
-        get_thread_worker('test_thread')
-        assert False, 'A KeyError should have been raised'
-    except KeyError:
-        # THEN: The mocked worker is returned
-        pass
-    except Exception:
-        assert False, 'A KeyError should have been raised'
+    # WHEN: get_thread_worker() is called
+    result = get_thread_worker('test_thread')
+
+    # THEN: None should have been returned
+    assert result is None
 
 
 @patch('openlp.core.threading.Registry')

tests/functional/openlp_plugins/songs/test_openlpimporter.py

@@ -22,6 +22,7 @@
 """
 This module contains tests for the OpenLP song importer.
 """
+from pathlib import Path
 from unittest import TestCase
 from unittest.mock import MagicMock, patch
 
@@ -66,10 +67,9 @@ class TestOpenLPImport(TestCase):
             importer.stop_import_flag = True
 
             # WHEN: Import source is not a list
-            for source in ['not a list', 0]:
-                importer.import_source = source
+            importer.import_source = Path()
 
-                # THEN: do_import should return none and the progress bar maximum should not be set.
-                assert importer.do_import() is None, 'do_import should return None when import_source is not a list'
-                assert mocked_import_wizard.progress_bar.setMaximum.called is False, \
-                    'setMaximum on import_wizard.progress_bar should not have been called'
+            # THEN: do_import should return none and the progress bar maximum should not be set.
+            assert importer.do_import() is None, 'do_import should return None when import_source is not a list'
+            assert mocked_import_wizard.progress_bar.setMaximum.called is False, \
+                'setMaximum on import_wizard.progress_bar should not have been called'