The java/awt/font/Gurmukhi/TestGurmukhi.java test is an automatic test for JDK-5004101 which can be open-sourced.

The test commented out code for displaying Gurmukhi text in a JTextArea.

It proves displaying the text isn't necessary, creating a TextLayout and getting TextHitInfo is enough to reproduce the original bug JDK-5004101.


The above is confirmed by running the TestGurmukhi.java test with JDK 5.0 beta-b32c:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 186
        at sun.font.ExtendedTextSourceLabel.caretAtOffsetIsValid(ExtendedTextSourceLabel.java:446)
        at java.awt.font.TextLine.caretAtOffsetIsValid(TextLine.java:498)
        at java.awt.font.TextLayout.hitTestChar(TextLayout.java:2552)
        at java.awt.font.TextLayout.hitTestChar(TextLayout.java:2611)
        at TestGurmukhi.main(TestGurmukhi.java:53)