QueueBrowserTest.testSenderBrowser test fails intermittently

See https://issues.apache.org/jira/browse/AMQ-4376. Updated June 14 2013: This test fails consistently on Mac OS and WIndows, but fails intermittently on Linux. Also, it passes when run as part of the whole JoramJmsTest suite, but fails when run alone.junit.framework.AssertionFailedError: expected:<2> but was:<0>
at junit.framework.Assert.fail(Assert.java:57)
at junit.framework.Assert.failNotEquals(Assert.java:329)
at junit.framework.Assert.assertEquals(Assert.java:78)
at junit.framework.Assert.assertEquals(Assert.java:234)
at junit.framework.Assert.assertEquals(Assert.java:241)
at org.objectweb.jtests.jms.conform.queue.QueueBrowserTest.testSenderBrowser(QueueBrowserTest.java:81)