preferencesBot = studioBot.openPreferences();
pageBot = preferencesBot.openCertificatValidationPage();
assertFalse( pageBot.isValidateCertificatesSelected() );
// restore defaults, this should select the certificate validation
pageBot.clickRestoreDefaultsButton();
assertTrue( pageBot.isValidateCertificatesSelected() );
// click OK, this should remove the property file as only defaults are set
preferencesBot.clickOkButton();
assertFalse( file.exists() );