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Are you really interested in an assertion that succeeds? Normally, the only interesting assertions are ones that fail.
Being a fervent JUnit devotee myself, I try and make the output of the tests as quiet as possible because it improves the signal-to-noise ratio when something doesn't pass. The best test run is one where everything passes and there's not a peep from stdout.
You could always work on your unit test until it succeeds and run "grep Assert test.java | wc -l". :-)