This test does pass with e.g. jdk9 b152 but fails consistently with b160, both Oracle and RI builds, at least on Windows 10 (I don't have another dual-screen system just now).
Easy to see that on the very first attempt to show a frame on the second screen, it goes somewhere to the NW corner of it.

RULE "java/awt/Multiscreen/LocationRelativeToTest/LocationRelativeToTest.java" Exception java.lang.RuntimeException: Test FAILED: setLocationRelativeTo() operates incorrectly