Fix some tests on windows.

openlp/core/ui/themeform.py

@@ -159,7 +159,7 @@ class ThemeForm(QtWidgets.QWizard, Ui_ThemeWizard, RegistryProperties):
         if not event:
             event = QtGui.QResizeEvent(self.size(), self.size())
         QtWidgets.QWizard.resizeEvent(self, event)
-        if self.currentPage() == self.preview_page:
+        if hasattr(self, 'preview_page') and self.currentPage() == self.preview_page:
             frame_width = self.preview_box_label.lineWidth()
             pixmap_width = self.preview_area.width() - 2 * frame_width
             pixmap_height = self.preview_area.height() - 2 * frame_width

tests/helpers/testmixin.py

@@ -48,13 +48,17 @@ class TestMixin(object):
         """
         Build the settings Object and initialise it
         """
-        Settings.setDefaultFormat(Settings.IniFormat)
         self.fd, self.ini_file = mkstemp('.ini')
-        Settings().set_filename(self.ini_file)
+        Settings.set_filename(self.ini_file)
+        Settings().setDefaultFormat(Settings.IniFormat)
+        # Needed on windows to make sure a Settings object is available during the tests
+        self.setting = Settings()        
+        Settings().setValue('themes/global theme', 'my_theme')
 
     def destroy_settings(self):
         """
         Destroy the Settings Object
         """
+        del self.setting
         os.close(self.fd)
         os.unlink(Settings().fileName())