The init()/cleanup() code in tst_qfiledialog and tst_qfiledialog2 currently differs and fails to clean up the settings file since it only removes the legacy settings under the Qt group and instantiates a new QFileDialog while the QSettings class is still in scope. Also, it has no means of clearing the setLastVisitedDirectory(), which causes the tst_QFiledialog::completer() and tst_QFiledialog::history() tests to interfere, leaving the settings in an invalid state. tst_qfiledialog2 does not use QStandardPaths::setTestModeEnabled((). - Ensure the last visited URL is always clean by making QFileDialogPrivate::setLastVisitedDirectory() static and calling it from init(). - Introduce a cleanupSettingsFile() function to the tests that cleans both groups and call it from initTestCase() and cleanup() to ensure a clean state. - Add QStandardPaths::setTestModeEnabled() to tst_qfiledialog2. Fixes sporadic test fails when executing tst_QFiledialog::completer() and tst_QFiledialog::history() in a sequence. Task-number: QTBUG-45764 Change-Id: I24de3caabf77be067b385d64ff11b7a07fe12b72 Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>