The test like this


/*
 * @test
 * @enablePreview
 * @run driver ${test.main.class}
 */

public class PreviewDriverTest {
    Integer i;
    public static void main(String[] args) throws Exception {
    }
}

fails in valhalla repo because class is compiled with enable-preview while executed without this option.

Test fails with:
java.lang.UnsupportedClassVersionError: Preview features are not enabled for PreviewDriverTest (class file version 71.65535). Try running with '--enable-preview'

It doesn't use any Valhalla feature directly but has a field Integer and javac generates additional attributes because of this.

Fix isjust to pass --enable-preview to driver code.
The workaround is to don't run driver tests with enable preview.