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In order to make sbt's behavior consistent with regards to calling System.exit after executing tests, it would be useful if we could configure to call System.exit for the child process when executing tests in forked mode.
This mailing list thread provides some extra background:
IMPORTANT This project has moved to https://github.com/sbt/sbt. This issue still exists to avoid dead links, but GitHub limitations prevent the original issue from being correctly preserved here. Please see sbt/sbt#565 for the full issue and to comment.