This test logs below messages on stderr :

test.javafx.scene.web.UserDataDirectoryTest > testSecurityErrorWithPassiveHandler STANDARD_ERROR
    onError: WebErrorEvent [source = javafx.scene.web.WebEngine@143b4959, eventType = USER_DATA_DIRECTORY_SECURITY_ERROR, message = "A security error occurred while setting up user data directory [foo]", exception = java.security.AccessControlException: access denied ("java.io.FilePermission" "/Users/XXX/jfx-dev/rt/modules/javafx.web/foo" "write")]

test.javafx.scene.web.UserDataDirectoryTest > testAlreadyInUseErrorWithPassiveHandler STANDARD_ERROR
    onError: WebErrorEvent [source = javafx.scene.web.WebEngine@3dcf5a3b, eventType = USER_DATA_DIRECTORY_ALREADY_IN_USE, message = "User data directory [baz] is already in use", exception = javafx.scene.web.DirectoryLock$DirectoryAlreadyInUseException: /Users/XXX/jfx-dev/rt/modules/javafx.web/baz]

test.javafx.scene.web.UserDataDirectoryTest > testIOErrorWithPassiveHandler STANDARD_ERROR
    onError: WebErrorEvent [source = javafx.scene.web.WebEngine@280fb0a1, eventType = USER_DATA_DIRECTORY_IO_ERROR, message = "An I/O error occurred while setting up user data directory [qux]", exception = java.nio.file.FileAlreadyExistsException: /Users/XXX/jfx-dev/rt/modules/javafx.web/qux]


Action needed :
----------------------
If these messages are expected, it should be stated in the log