diff --git a/openlp/core/common/__init__.py b/openlp/core/common/__init__.py
index 99e222041..b6d759f42 100644
--- a/openlp/core/common/__init__.py
+++ b/openlp/core/common/__init__.py
@@ -80,6 +80,7 @@ def extension_loader(glob_pattern, excluded_files=[]):
         extension_path = extension_path.relative_to(app_dir)
         if extension_path.name in excluded_files:
             continue
+        log.debug('Attempting to import %s', extension_path)
         module_name = path_to_module(extension_path)
         try:
             importlib.import_module(module_name)
diff --git a/openlp/core/lib/pluginmanager.py b/openlp/core/lib/pluginmanager.py
index d4a02f8c0..c82e26eec 100644
--- a/openlp/core/lib/pluginmanager.py
+++ b/openlp/core/lib/pluginmanager.py
@@ -71,7 +71,7 @@ class PluginManager(RegistryBase, LogMixin, RegistryProperties):
         """
         Scan a directory for objects inheriting from the ``Plugin`` class.
         """
-        glob_pattern = os.path.join('plugins', '*', '*plugin.py')
+        glob_pattern = os.path.join('plugins', '*', '[!.]*plugin.py')
         extension_loader(glob_pattern)
         plugin_classes = Plugin.__subclasses__()
         plugin_objects = []
diff --git a/openlp/core/ui/media/mediacontroller.py b/openlp/core/ui/media/mediacontroller.py
index 10c384b0c..87d3a3063 100644
--- a/openlp/core/ui/media/mediacontroller.py
+++ b/openlp/core/ui/media/mediacontroller.py
@@ -181,7 +181,8 @@ class MediaController(RegistryBase, LogMixin, RegistryProperties):
         """
         log.debug('_check_available_media_players')
         controller_dir = os.path.join('core', 'ui', 'media')
-        glob_pattern = os.path.join(controller_dir, '*player.py')
+        # Find all files that do not begin with '.' (lp:#1738047) and end with player.py
+        glob_pattern = os.path.join(controller_dir, '[!.]*player.py')
         extension_loader(glob_pattern, ['mediaplayer.py'])
         player_classes = MediaPlayer.__subclasses__()
         for player_class in player_classes:
diff --git a/openlp/core/ui/servicemanager.py b/openlp/core/ui/servicemanager.py
index 29718e09a..875a48fdf 100644
--- a/openlp/core/ui/servicemanager.py
+++ b/openlp/core/ui/servicemanager.py
@@ -370,7 +370,7 @@ class ServiceManager(QtWidgets.QWidget, RegistryBase, Ui_ServiceManager, LogMixi
         :rtype: None
         """
         self._service_path = file_path
-        self.main_window.set_service_modified(self.is_modified(), file_path.name)
+        self.set_modified(self.is_modified())
         Settings().setValue('servicemanager/last file', file_path)
         if file_path and file_path.suffix == '.oszl':
             self._save_lite = True
diff --git a/openlp/plugins/bibles/forms/bibleimportform.py b/openlp/plugins/bibles/forms/bibleimportform.py
index 35dd82eeb..857c48f74 100644
--- a/openlp/plugins/bibles/forms/bibleimportform.py
+++ b/openlp/plugins/bibles/forms/bibleimportform.py
@@ -336,6 +336,7 @@ class BibleImportForm(OpenLPWizard):
         self.sword_layout.addWidget(self.sword_tab_widget)
         self.sword_disabled_label = QtWidgets.QLabel(self.sword_widget)
         self.sword_disabled_label.setObjectName('SwordDisabledLabel')
+        self.sword_disabled_label.setWordWrap(True)
         self.sword_layout.addWidget(self.sword_disabled_label)
         self.select_stack.addWidget(self.sword_widget)
         self.wordproject_widget = QtWidgets.QWidget(self.select_page)
diff --git a/openlp/plugins/presentations/presentationplugin.py b/openlp/plugins/presentations/presentationplugin.py
index a68a22176..c65971f11 100644
--- a/openlp/plugins/presentations/presentationplugin.py
+++ b/openlp/plugins/presentations/presentationplugin.py
@@ -129,7 +129,8 @@ class PresentationPlugin(Plugin):
         """
         log.debug('check_pre_conditions')
         controller_dir = os.path.join('plugins', 'presentations', 'lib')
-        glob_pattern = os.path.join(controller_dir, '*controller.py')
+        # Find all files that do not begin with '.' (lp:#1738047) and end with controller.py
+        glob_pattern = os.path.join(controller_dir, '[!.]*controller.py')
         extension_loader(glob_pattern, ['presentationcontroller.py'])
         controller_classes = PresentationController.__subclasses__()
         for controller_class in controller_classes:
diff --git a/tests/functional/openlp_core/test_app.py b/tests/functional/openlp_core/test_app.py
index 6f5b05803..7878f6c71 100644
--- a/tests/functional/openlp_core/test_app.py
+++ b/tests/functional/openlp_core/test_app.py
@@ -310,7 +310,7 @@ class TestOpenLP(TestCase):
 
         # THEN:
         assert result is True, "The method should have returned True."
-        # self.assertFalse(self.openlp.main_window.isMinimized())
+        # assert self.openlp.main_window.isMinimized() is False
 
     @patch('openlp.core.app.get_version')
     @patch('openlp.core.app.QtWidgets.QMessageBox.question')
diff --git a/tests/functional/openlp_plugins/bibles/test_csvimport.py b/tests/functional/openlp_plugins/bibles/test_csvimport.py
index 4d948f53b..7c47f3a80 100644
--- a/tests/functional/openlp_plugins/bibles/test_csvimport.py
+++ b/tests/functional/openlp_plugins/bibles/test_csvimport.py
@@ -64,9 +64,9 @@ class TestCSVImport(TestCase):
             CSVBible(mocked_manager, path='.', name='.', books_path=Path('books.csv'), verse_path=Path('verse.csv'))
 
         # THEN: The importer should be an instance of BibleImport
-        self.assertIsInstance(importer, BibleImport)
-        self.assertEqual(importer.books_path, Path('books.csv'))
-        self.assertEqual(importer.verses_path, Path('verse.csv'))
+        assert isinstance(importer, BibleImport)
+        assert importer.books_path == Path('books.csv')
+        assert importer.verses_path == Path('verse.csv')
 
     def test_book_namedtuple(self):
         """
@@ -77,10 +77,10 @@ class TestCSVImport(TestCase):
         result = Book('id', 'testament_id', 'name', 'abbreviation')
 
         # THEN: The attributes should match up with the data we used
-        self.assertEqual(result.id, 'id')
-        self.assertEqual(result.testament_id, 'testament_id')
-        self.assertEqual(result.name, 'name')
-        self.assertEqual(result.abbreviation, 'abbreviation')
+        assert result.id == 'id'
+        assert result.testament_id == 'testament_id'
+        assert result.name == 'name'
+        assert result.abbreviation == 'abbreviation'
 
     def test_verse_namedtuple(self):
         """
@@ -91,10 +91,10 @@ class TestCSVImport(TestCase):
         result = Verse('book_id_name', 'chapter_number', 'number', 'text')
 
         # THEN: The attributes should match up with the data we used
-        self.assertEqual(result.book_id_name, 'book_id_name')
-        self.assertEqual(result.chapter_number, 'chapter_number')
-        self.assertEqual(result.number, 'number')
-        self.assertEqual(result.text, 'text')
+        assert result.book_id_name == 'book_id_name'
+        assert result.chapter_number == 'chapter_number'
+        assert result.number == 'number'
+        assert result.text == 'text'
 
     def test_get_book_name_id(self):
         """
@@ -109,7 +109,7 @@ class TestCSVImport(TestCase):
             actual_result = CSVBible.get_book_name(name, books)
 
             # THEN: get_book_name() should return the book name associated with that id from the books dictionary
-            self.assertEqual(actual_result, expected_result)
+            assert actual_result == expected_result
 
     def test_get_book_name(self):
         """
@@ -124,7 +124,7 @@ class TestCSVImport(TestCase):
             actual_result = CSVBible.get_book_name(name, books)
 
             # THEN: get_book_name() should return the input
-            self.assertEqual(actual_result, expected_result)
+            assert actual_result == expected_result
 
     def test_parse_csv_file(self):
         """
@@ -144,8 +144,8 @@ class TestCSVImport(TestCase):
             result = CSVBible.parse_csv_file(Path('file.csv'), TestTuple)
 
             # THEN: A list of TestTuple instances with the parsed data should be returned
-            self.assertEqual(result, [TestTuple('1', 'Line 1', 'Data 1'), TestTuple('2', 'Line 2', 'Data 2'),
-                                      TestTuple('3', 'Line 3', 'Data 3')])
+            assert result == [TestTuple('1', 'Line 1', 'Data 1'), TestTuple('2', 'Line 2', 'Data 2'),
+                              TestTuple('3', 'Line 3', 'Data 3')]
             mocked_open.assert_called_once_with('r', encoding='utf-8', newline='')
             mocked_reader.assert_called_once_with(ANY, delimiter=',', quotechar='"')
 
@@ -162,7 +162,7 @@ class TestCSVImport(TestCase):
             # THEN: A ValidationError should be raised
             with self.assertRaises(ValidationError) as context:
                 CSVBible.parse_csv_file(Path('file.csv'), None)
-            self.assertEqual(context.exception.msg, 'Parsing "file.csv" failed')
+            assert context.exception.msg == 'Parsing "file.csv" failed'
 
     def test_parse_csv_file_csverror(self):
         """
@@ -178,7 +178,7 @@ class TestCSVImport(TestCase):
             # THEN: A ValidationError should be raised
             with self.assertRaises(ValidationError) as context:
                 CSVBible.parse_csv_file(Path('file.csv'), None)
-            self.assertEqual(context.exception.msg, 'Parsing "file.csv" failed')
+            assert context.exception.msg == 'Parsing "file.csv" failed'
 
     def test_process_books_stopped_import(self):
         """
@@ -197,8 +197,8 @@ class TestCSVImport(TestCase):
             result = importer.process_books(['Book 1'])
 
             # THEN: increment_progress_bar should not be called and the return value should be an empty dictionary
-            self.assertFalse(importer.wizard.increment_progress_bar.called)
-            self.assertEqual(result, {})
+            assert importer.wizard.increment_progress_bar.called is False
+            assert result == {}
 
     def test_process_books(self):
         """
@@ -222,9 +222,9 @@ class TestCSVImport(TestCase):
 
             # THEN: translate and find_and_create_book should have been called with both book names.
             # 		The returned data should be a dictionary with both song's id and names.
-            self.assertEqual(importer.find_and_create_book.mock_calls,
-                             [call('1. Mosebog', 2, 10), call('2. Mosebog', 2, 10)])
-            self.assertDictEqual(result, {1: '1. Mosebog', 2: '2. Mosebog'})
+            assert importer.find_and_create_book.mock_calls == \
+                [call('1. Mosebog', 2, 10), call('2. Mosebog', 2, 10)]
+            assert result == {1: '1. Mosebog', 2: '2. Mosebog'}
 
     def test_process_verses_stopped_import(self):
         """
@@ -244,8 +244,8 @@ class TestCSVImport(TestCase):
             result = importer.process_verses(['Dummy Verse'], [])
 
             # THEN: get_book_name should not be called and the return value should be None
-            self.assertFalse(importer.get_book_name.called)
-            self.assertIsNone(result)
+            assert importer.get_book_name.called is False
+            assert result is None
 
     def test_process_verses_successful(self):
         """
@@ -272,13 +272,13 @@ class TestCSVImport(TestCase):
             importer.process_verses(verses, books)
 
             # THEN: create_verse is called with the test data
-            self.assertEqual(importer.get_book_name.mock_calls, [call(1, books), call(1, books)])
+            assert importer.get_book_name.mock_calls == [call(1, books), call(1, books)]
             importer.get_book.assert_called_once_with('1. Mosebog')
-            self.assertEqual(importer.session.commit.call_count, 2)
-            self.assertEqual(importer.create_verse.mock_calls,
-                             [call('1', 1, 1, 'I Begyndelsen skabte Gud Himmelen og Jorden.'),
-                              call('1', 1, 2, 'Og Jorden var øde og tom, og der var Mørke over Verdensdybet. '
-                                              'Men Guds Ånd svævede over Vandene.')])
+            assert importer.session.commit.call_count == 2
+            assert importer.create_verse.mock_calls == \
+                [call('1', 1, 1, 'I Begyndelsen skabte Gud Himmelen og Jorden.'),
+                 call('1', 1, 2, 'Og Jorden var øde og tom, og der var Mørke over Verdensdybet. '
+                                 'Men Guds Ånd svævede over Vandene.')]
 
     def test_do_import_invalid_language_id(self):
         """
@@ -296,7 +296,7 @@ class TestCSVImport(TestCase):
 
             # THEN: The False should be returned.
             importer.get_language.assert_called_once_with('Bible Name')
-            self.assertFalse(result)
+            assert result is False
 
     def test_do_import_success(self):
         """
@@ -320,11 +320,11 @@ class TestCSVImport(TestCase):
 
             # THEN: parse_csv_file should be called twice,
             # and True should be returned.
-            self.assertEqual(importer.parse_csv_file.mock_calls,
-                             [call(Path('books.csv'), Book), call(Path('verses.csv'), Verse)])
+            assert importer.parse_csv_file.mock_calls == \
+                [call(Path('books.csv'), Book), call(Path('verses.csv'), Verse)]
             importer.process_books.assert_called_once_with(['Book 1'])
             importer.process_verses.assert_called_once_with(['Verse 1'], ['Book 1'])
-            self.assertTrue(result)
+            assert result is True
 
     def test_file_import(self):
         """
@@ -353,7 +353,7 @@ class TestCSVImport(TestCase):
             importer.do_import()
 
             # THEN: The create_verse() method should have been called with each verse in the file.
-            self.assertTrue(importer.create_verse.called)
+            assert importer.create_verse.called is True
             for verse_tag, verse_text in test_data['verses']:
                 importer.create_verse.assert_any_call(importer.get_book().id, 1, verse_tag, verse_text)
             importer.create_book.assert_any_call('1. Mosebog', importer.get_book_ref_id_by_name(), 1)
diff --git a/tests/functional/openlp_plugins/bibles/test_osisimport.py b/tests/functional/openlp_plugins/bibles/test_osisimport.py
index 02c6c3654..8c1b26abb 100644
--- a/tests/functional/openlp_plugins/bibles/test_osisimport.py
+++ b/tests/functional/openlp_plugins/bibles/test_osisimport.py
@@ -67,7 +67,7 @@ class TestOsisImport(TestCase):
         importer = OSISBible(mocked_manager, path='.', name='.', file_path=None)
 
         # THEN: The importer should be an instance of BibleDB
-        self.assertIsInstance(importer, BibleDB)
+        assert isinstance(importer, BibleDB)
 
     def test_process_books_stop_import(self):
         """
@@ -82,7 +82,7 @@ class TestOsisImport(TestCase):
         importer.process_books(mocked_data)
 
         # THEN: find_and_create_book should not have been called
-        self.assertFalse(self.mocked_find_and_create_book.called)
+        assert self.mocked_find_and_create_book.called is False
 
     def test_process_books_completes(self):
         """
@@ -106,11 +106,9 @@ class TestOsisImport(TestCase):
             importer.process_books(mocked_data)
 
             # THEN: find_and_create_book and process_books should be called with the details from the mocked books
-            self.assertEqual(self.mocked_find_and_create_book.call_args_list,
-                             [call('Name1', 2, 10), call('Name2', 2, 10)])
-            self.assertEqual(mocked_process_chapters.call_args_list,
-                             [call('db_book1', book1), call('db_book2', book2)])
-            self.assertEqual(importer.session.commit.call_count, 2)
+            assert self.mocked_find_and_create_book.call_args_list == [call('Name1', 2, 10), call('Name2', 2, 10)]
+            assert mocked_process_chapters.call_args_list == [call('db_book1', book1), call('db_book2', book2)]
+            assert importer.session.commit.call_count == 2
 
     def test_process_chapters_verse_in_chapter_verse_text(self):
         """
@@ -185,8 +183,8 @@ class TestOsisImport(TestCase):
             importer.process_chapters(test_book, [test_chapter])
 
             # THEN: neither set_current_chapter or process_verse should have been called
-            self.assertFalse(mocked_set_current_chapter.called)
-            self.assertFalse(mocked_process_verse.called)
+            assert mocked_set_current_chapter.called is False
+            assert mocked_process_verse.called is False
 
     def test_process_chapters_milestones_chapter_sid(self):
         """
@@ -233,7 +231,7 @@ class TestOsisImport(TestCase):
             importer.process_chapters(test_book, [test_verse])
 
             # THEN: process_verse should have been called with the test data
-            self.assertFalse(mocked_set_current_chapter.called)
+            assert mocked_set_current_chapter.called is False
             mocked_process_verse.assert_called_once_with(test_book, 0, test_verse, use_milestones=True)
 
     def test_process_verse_no_osis_id(self):
@@ -252,7 +250,7 @@ class TestOsisImport(TestCase):
         importer.process_verse(test_book, 2, test_verse)
 
         # THEN: create_verse should not have been called
-        self.assertFalse(self.mocked_create_verse.called)
+        assert self.mocked_create_verse.called is False
 
     def test_process_verse_use_milestones_no_s_id(self):
         """
@@ -271,7 +269,7 @@ class TestOsisImport(TestCase):
         importer.process_verse(test_book, 2, test_verse)
 
         # THEN: create_verse should not have been called
-        self.assertFalse(self.mocked_create_verse.called)
+        assert self.mocked_create_verse.called is False
 
     def test_process_verse_use_milestones_no_tail(self):
         """
@@ -289,7 +287,7 @@ class TestOsisImport(TestCase):
         importer.process_verse(test_book, 2, test_verse, use_milestones=True)
 
         # THEN: create_verse should not have been called
-        self.assertFalse(self.mocked_create_verse.called)
+        assert self.mocked_create_verse.called is False
 
     def test_process_verse_use_milestones_success(self):
         """
@@ -327,7 +325,7 @@ class TestOsisImport(TestCase):
         importer.process_verse(test_book, 2, test_verse)
 
         # THEN: create_verse should not have been called
-        self.assertFalse(self.mocked_create_verse.called)
+        assert self.mocked_create_verse.called is False
 
     def test_process_verse_success(self):
         """
@@ -363,8 +361,8 @@ class TestOsisImport(TestCase):
             result = importer.do_import()
 
             # THEN: do_import should return False and get_language_id should have not been called
-            self.assertFalse(result)
-            self.assertFalse(mocked_language_id.called)
+            assert result is False
+            assert mocked_language_id.called is False
 
     def test_do_import_no_language(self):
         """
@@ -382,8 +380,8 @@ class TestOsisImport(TestCase):
             result = importer.do_import()
 
             # THEN: do_import should return False and process_books should have not been called
-            self.assertFalse(result)
-            self.assertFalse(mocked_process_books.called)
+            assert result is False
+            assert mocked_process_books.called is False
 
     def test_do_import_completes(self):
         """
@@ -401,7 +399,7 @@ class TestOsisImport(TestCase):
             result = importer.do_import()
 
             # THEN: do_import should return True
-            self.assertTrue(result)
+            assert result is True
 
 
 class TestOsisImportFileImports(TestCase):
@@ -442,7 +440,7 @@ class TestOsisImportFileImports(TestCase):
             importer.do_import()
 
             # THEN: The create_verse() method should have been called with each verse in the file.
-            self.assertTrue(importer.create_verse.called)
+            assert importer.create_verse.called is True
             for verse_tag, verse_text in test_data['verses']:
                 importer.create_verse.assert_any_call(importer.create_book().id, 1, verse_tag, verse_text)
 
@@ -472,7 +470,7 @@ class TestOsisImportFileImports(TestCase):
             importer.do_import()
 
             # THEN: The create_verse() method should have been called with each verse in the file.
-            self.assertTrue(importer.create_verse.called)
+            assert importer.create_verse.called is True
             for verse_tag, verse_text in test_data['verses']:
                     importer.create_verse.assert_any_call(importer.create_book().id, 1, verse_tag, verse_text)
 
@@ -502,7 +500,7 @@ class TestOsisImportFileImports(TestCase):
             importer.do_import()
 
             # THEN: The create_verse() method should have been called with each verse in the file.
-            self.assertTrue(importer.create_verse.called)
+            assert importer.create_verse.called
             for verse_tag, verse_text in test_data['verses']:
                 importer.create_verse.assert_any_call(importer.create_book().id, 1, verse_tag, verse_text)
 
@@ -532,6 +530,6 @@ class TestOsisImportFileImports(TestCase):
             importer.do_import()
 
             # THEN: The create_verse() method should have been called with each verse in the file.
-            self.assertTrue(importer.create_verse.called)
+            assert importer.create_verse.called is True
             for verse_tag, verse_text in test_data['verses']:
                 importer.create_verse.assert_any_call(importer.create_book().id, 1, verse_tag, verse_text)
diff --git a/tests/functional/openlp_plugins/bibles/test_swordimport.py b/tests/functional/openlp_plugins/bibles/test_swordimport.py
index 34e011498..3ca1cba87 100644
--- a/tests/functional/openlp_plugins/bibles/test_swordimport.py
+++ b/tests/functional/openlp_plugins/bibles/test_swordimport.py
@@ -67,7 +67,7 @@ class TestSwordImport(TestCase):
         importer = SwordBible(mocked_manager, path='.', name='.', file_path=None, sword_key='', sword_path='')
 
         # THEN: The importer should be an instance of BibleDB
-        self.assertIsInstance(importer, BibleDB)
+        assert isinstance(importer, BibleDB)
 
     @patch('openlp.plugins.bibles.lib.importers.sword.SwordBible.application')
     @patch('openlp.plugins.bibles.lib.importers.sword.modules')
@@ -106,6 +106,6 @@ class TestSwordImport(TestCase):
         importer.do_import()
 
         # THEN: The create_verse() method should have been called with each verse in the file.
-        self.assertTrue(importer.create_verse.called)
+        assert importer.create_verse.called is True
         for verse_tag, verse_text in test_data['verses']:
             importer.create_verse.assert_any_call(importer.create_book().id, 1, int(verse_tag), verse_text)
diff --git a/tests/functional/openlp_plugins/presentations/test_impresscontroller.py b/tests/functional/openlp_plugins/presentations/test_impresscontroller.py
index f08e0b8ac..9e15a0c79 100644
--- a/tests/functional/openlp_plugins/presentations/test_impresscontroller.py
+++ b/tests/functional/openlp_plugins/presentations/test_impresscontroller.py
@@ -23,7 +23,7 @@
 Functional tests to test the Impress class and related methods.
 """
 from unittest import TestCase
-from unittest.mock import MagicMock
+from unittest.mock import MagicMock, patch
 import shutil
 from tempfile import mkdtemp
 
@@ -72,6 +72,60 @@ class TestImpressController(TestCase, TestMixin):
         self.assertEqual('Impress', controller.name,
                          'The name of the presentation controller should be correct')
 
+    @patch('openlp.plugins.presentations.lib.impresscontroller.log')
+    def test_check_available(self, mocked_log):
+        """
+        Test `ImpressController.check_available` on Windows
+        """
+        # GIVEN: An instance of :class:`ImpressController`
+        controller = ImpressController(plugin=self.mock_plugin)
+
+        # WHEN: `check_available` is called on Windows and `get_com_servicemanager` returns None
+        with patch('openlp.plugins.presentations.lib.impresscontroller.is_win', return_value=True), \
+                patch.object(controller, 'get_com_servicemanager', return_value=None) as mocked_get_com_servicemanager:
+            result = controller.check_available()
+
+            # THEN: `check_available` should return False
+            assert mocked_get_com_servicemanager.called is True
+            assert result is False
+
+    @patch('openlp.plugins.presentations.lib.impresscontroller.log')
+    def test_check_available1(self, mocked_log):
+        """
+        Test `ImpressController.check_available` on Windows
+        """
+        # GIVEN: An instance of :class:`ImpressController`
+        controller = ImpressController(plugin=self.mock_plugin)
+
+        # WHEN: `check_available` is called on Windows and `get_com_servicemanager` returns an object
+        mocked_com_object = MagicMock()
+        with patch('openlp.plugins.presentations.lib.impresscontroller.is_win', return_value=True), \
+                patch.object(controller, 'get_com_servicemanager', return_value=mocked_com_object) \
+                as mocked_get_com_servicemanager:
+            result = controller.check_available()
+
+            # THEN: `check_available` should return True
+            assert mocked_get_com_servicemanager.called is True
+            assert result is True
+
+    @patch('openlp.plugins.presentations.lib.impresscontroller.log')
+    @patch('openlp.plugins.presentations.lib.impresscontroller.is_win', return_value=False)
+    def test_check_available2(self, mocked_is_win, mocked_log):
+        """
+        Test `ImpressController.check_available` when not on Windows
+        """
+        # GIVEN: An instance of :class:`ImpressController`
+        controller = ImpressController(plugin=self.mock_plugin)
+
+        # WHEN: `check_available` is called on Windows and `uno_available` is True
+        with patch('openlp.plugins.presentations.lib.impresscontroller.uno_available', True), \
+                patch.object(controller, 'get_com_servicemanager') as mocked_get_com_servicemanager:
+            result = controller.check_available()
+
+            # THEN: `check_available` should return True
+            assert mocked_get_com_servicemanager.called is False
+            assert result is True
+
 
 class TestImpressDocument(TestCase):
     """