tests: mock QMessageBox.information too

The clone operation uses QMessageBox.information now to inform about
success. Do not hang waiting for click there.

Fixes: 8500b36 "clone_vm: Don't use warning MessageBox on success"

qubesmanager/tests/test_clone_vm.py

@@ -50,11 +50,15 @@ def setUp(self):
         self.mock_progress = self.patcher_progress.start()
         self.addCleanup(self.patcher_progress.stop)
 
-        # mock the progress dialog to speed testing up
+        # mock the message dialog to not hang on success
         self.patcher_warning = unittest.mock.patch(
             'PyQt5.QtWidgets.QMessageBox.warning')
         self.mock_warning = self.patcher_warning.start()
         self.addCleanup(self.patcher_warning.stop)
+        self.patcher_information = unittest.mock.patch(
+            'PyQt5.QtWidgets.QMessageBox.information')
+        self.mock_information = self.patcher_information.start()
+        self.addCleanup(self.patcher_information.stop)
 
         self.dialog = clone_vm.CloneVMDlg(self.qtapp, self.qapp)
 
@@ -229,11 +233,15 @@ def setUp(self):
         self.mock_progress = self.patcher_progress.start()
         self.addCleanup(self.patcher_progress.stop)
 
-        # mock the progress dialog to speed testing up
+        # mock the message dialog to not hang on success
         self.patcher_warning = unittest.mock.patch(
             'PyQt5.QtWidgets.QMessageBox.warning')
         self.mock_warning = self.patcher_warning.start()
         self.addCleanup(self.patcher_warning.stop)
+        self.patcher_information = unittest.mock.patch(
+            'PyQt5.QtWidgets.QMessageBox.information')
+        self.mock_information = self.patcher_information.start()
+        self.addCleanup(self.patcher_information.stop)
 
         self.src_vm = next(
             domain for domain in self.qapp.domains