java.lang.AssertionError: null

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Check your pattern declaration or check your assert declaration.

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java.lang.AssertionError: null
at org.junit.Assert.fail(Assert.java:92)
at org.junit.Assert.assertTrue(Assert.java:43)
at org.junit.Assert.assertTrue(Assert.java:54)
at org.apache.hadoop.yarn.client.TestRMFailover.verifyExpectedException(TestRMFailover.java:250)

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