Fix potential crash in tests

We need to wait for the thread to finish

Author: timxx

tests/test_app.py

@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 import os
 from unittest.mock import patch
+
 from PySide6.QtTest import QSignalSpy, QTest
 
 from qgitc.gitutils import Git, GitProcess
@@ -59,6 +60,10 @@ def testUpdateRepo(self):
         self.app.updateRepoDir(oldRepoDir)
         self.assertEqual(spy.count(), 2)
 
+        if self.app._findSubmoduleThread and self.app._findSubmoduleThread.isRunning():
+            self.app._findSubmoduleThread.requestInterruption()
+            self.app._findSubmoduleThread.wait()
+
 
 class TestAppNoRepo(TestBase):
     def doCreateRepo(self):