Add tests for autosaveDelay gui and metadata

Try to toggle in gui, set a value, save it.
Chcek value saved is currect in metadata.
Check that on loading saved value presented in gui and toggeled.

Part of issue keepassxreboot#8553

tests/gui/TestGui.cpp

@@ -1470,6 +1470,10 @@ void TestGui::testDatabaseSettings()
     auto* dbSettingsStackedWidget = dbSettingsDialog->findChild<QStackedWidget*>("stackedWidget");
     auto* transformRoundsSpinBox = dbSettingsDialog->findChild<QSpinBox*>("transformRoundsSpinBox");
     auto advancedToggle = dbSettingsDialog->findChild<QCheckBox*>("advancedSettingsToggle");
+    auto* autosaveDelayCheckBox = dbSettingsDialog->findChild<QCheckBox*>("autosaveDelayCheckBox");
+    auto* autosaveDelaySpinBox = dbSettingsDialog->findChild<QSpinBox*>("autosaveDelaySpinBox");
+    auto* dbSettingsButtonBox = dbSettingsDialog->findChild<QDialogButtonBox*>("buttonBox");
+    int autosaveDelayTestValue = 2;
 
     advancedToggle->setChecked(true);
     QApplication::processEvents();
@@ -1481,7 +1485,20 @@ void TestGui::testDatabaseSettings()
     QTest::keyClick(transformRoundsSpinBox, Qt::Key_Enter);
     QTRY_COMPARE(m_db->kdf()->rounds(), 123456);
 
+    // Test loading default values and setting autosaveDelay
+    triggerAction("actionDatabaseSettings");
+    QVERIFY(autosaveDelayCheckBox->isChecked() == false);
+    autosaveDelayCheckBox->toggle();
+    autosaveDelaySpinBox->setValue(autosaveDelayTestValue);
+    QTest::mouseClick(dbSettingsButtonBox->button(QDialogButtonBox::Ok), Qt::LeftButton);
+    QTRY_COMPARE(m_db->metadata()->autosaveDelayMin(), autosaveDelayTestValue);
+
     checkSaveDatabase();
+
+    // Test loading autosaveDelay non-default values
+    triggerAction("actionDatabaseSettings");
+    QTRY_COMPARE(autosaveDelayCheckBox->isChecked(), true);
+    QTRY_COMPARE(autosaveDelaySpinBox->value(), autosaveDelayTestValue);
 }
 
 void TestGui::testKeePass1Import()