Update linting for tests

tests/tools.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
 
 import shutil
@@ -124,7 +124,7 @@ def xmlToText(xElem):
 
 
 def readFile(fileName: str | Path):
-    """Returns the content of a file as a string."""
+    """Return the content of a file as a string."""
     with open(fileName, mode="r", encoding="utf-8") as inFile:
         return inFile.read()
 
@@ -154,8 +154,6 @@ def cleanProject(path: str | Path):
     if tocFile.is_file():
         tocFile.unlink()
 
-    return
-
 
 def clearLogHandlers():
     """Clear all log handlers."""
@@ -235,7 +233,6 @@ class SimpleDialog(QDialog):
         self.setLayout(layout)
         if widget:
             layout.addWidget(widget)
-        return
 
     @property
     def widget(self) -> QWidget | None:
@@ -246,4 +243,3 @@ class SimpleDialog(QDialog):
         layout = self.layout()
         assert layout is not None
         layout.addWidget(widget)
-        return