Update linting for tests

tests/mocked.py

@@ -17,7 +17,7 @@ General Public License for more details.
 
 You should have received a copy of the GNU General Public License
 along with this program. If not, see <https://www.gnu.org/licenses/>.
-"""
+"""  # noqa
 from __future__ import annotations
 
 from unittest.mock import MagicMock
@@ -35,7 +35,6 @@ class MockGuiMain(QWidget):
         self.docViewer = MagicMock()
         self.mainProgress = MagicMock()
         self.projPath = ""
-        return
 
     def postLaunchTasks(self, cmdOpen):
         return
@@ -45,7 +44,6 @@ class MockGuiMain(QWidget):
 
     def openProject(self, projPath):
         self.projPath = projPath
-        return
 
     def rebuildIndex(self):
         return
@@ -64,7 +62,6 @@ class MockTheme:
         self.guiFont = QFont()
         self.guiFontB = QFont()
         self.guiFontBU = QFont()
-        return
 
     def initThemes(self) -> None:
         return
@@ -96,8 +93,10 @@ class MockApp:
 # Mock functions that will raise errors instead.
 
 def causeOSError(*args, **kwargs):
+    """Raise an OSError."""
     raise OSError("Mock OSError")
 
 
 def causeException(*args, **kwargs):
+    """Raise an Exception."""
     raise Exception("Mock Exception")