This test was updated and de-problem listed
https://bugs.openjdk.java.net/browse/JDK-8284888
https://git.openjdk.java.net/jdk/pull/8380
However it still can fail - failure seen on an M1 24" imac running macOS 11.5.2


----------System.out:(9/653)----------
imageicon captureRect java.awt.Rectangle[x=875,y=381,width=16,height=16]
icon captureRect java.awt.Rectangle[x=875,y=381,width=16,height=16]
[javax.swing.plaf.metal.MetalLookAndFeel] : SUCCESS: icon and imageIcon same.
imageicon captureRect java.awt.Rectangle[x=876,y=377,width=16,height=16]
icon captureRect java.awt.Rectangle[x=876,y=377,width=16,height=16]
[javax.swing.plaf.nimbus.NimbusLookAndFeel] : ERROR: icon and imageIcon not same.
imageicon captureRect java.awt.Rectangle[x=882,y=403,width=476,height=27]
icon captureRect java.awt.Rectangle[x=882,y=403,width=476,height=27]
[com.apple.laf.AquaLookAndFeel] : SUCCESS: icon and imageIcon same.
----------System.err:(13/850)----------
java.lang.RuntimeException: Error Log:
[javax.swing.plaf.nimbus.NimbusLookAndFeel] : ERROR: icon and imageIcon not same.
at JInternalFrameIconTest.main(JInternalFrameIconTest.java:70)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:578)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:1585)

JavaTest Message: Test threw exception: java.lang.RuntimeException: Error Log:
[javax.swing.plaf.nimbus.NimbusLookAndFeel] : ERROR: icon and imageIcon not same.
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: Error Log: [javax.swing.plaf.nimbus.NimbusLookAndFeel] : ERROR: icon and imageIcon not same.