LogMonitor can corrupt test logs files and cause tests subclassing
AbstractLoggingTests to fail.
------------------------------------------------------------------------------------------------
Key: QPID-3501
URL: https://issues.apache.org/jira/browse/QPID-3501
Project: Qpid
Issue Type: Bug
Components: Java Tests
Reporter: Keith Wall
Assignee: Keith Wall
Fix For: 0.13
On an old slow CI box, occasionally we see test failures from those tests
subclassing AbstractLoggingTests (ChannelLoggingTests, ExchangeLoggingTest etc).
For example: org.apache.qpid.server.logging.ExchangeLoggingTest fails on the
0-9-1 test profile with exception:
{code}
TestName: testDiscardedMessage Duration: 11.167
Incorrect message expected:<...3> but was:<...1>
junit.framework.ComparisonFailure: Incorrect message expected:<...3> but
was:<...1>
at
org.apache.qpid.server.logging.AbstractTestLogging.validateMessageID(AbstractTestLogging.java:119)
at
org.apache.qpid.server.logging.ExchangeLoggingTest.testDiscardedMessage(ExchangeLoggingTest.java:249)
at
org.apache.qpid.test.utils.QpidBrokerTestCase.runBare(QpidBrokerTestCase.java:238)
at org.apache.qpid.test.utils.QpidTestCase.run(QpidTestCase.java:131)
{code}
Analysis shows that the tests' assertions are failing because the test standard
out file is corrupt. When the test fails, the .out file contains a long
sequence of ASCII NULs and parts of the log are duplicated. It is the
duplication that causes the assertion failure, as the log files contain
incorrect numbers of operation log messages (EXH- in this case).
{code}
od -a
TEST-org.apache.qpid.server.logging.ExchangeLoggingTest.testDiscardedMessage.out
| head
0000000 nul nul nul nul nul nul nul nul nul nul nul nul nul nul nul nul
*
0164000 nul nul nul nul nul nul nul nul nul nul nul nul m a i n
0164020 sp 2 0 1 1 - 0 9 - 2 1 sp 2 1 : 1
{code}
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