RFR(XS): 8131142: late-bind check for testng.jar presence in Nashorn test execution

[Michael Haupt]

Dear all,

please review and sponsor this change:
RFE: https://bugs.openjdk.java.net/browse/JDK-8131142
Webrev: http://cr.openjdk.java.net/~mhaupt/8131142/webrev.00

The issue was that, in a fresh Nashorn workspace, testng.jar would be downloaded upon first running ant test, but it would not be found as the property representing its presence was set before. This change moves the download to a point very early in initialising the infrastructure so that the presence property is correctly set.

Thanks,

Michael

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