Spurious test failure in TestCaptureOops.test_two_oops_gives_two_detail

[Curtis Hovey]

test_two_oops_gives_two_details will fail intermittently.

I ran the following command repeatedly in my locate environment and saw 1/3 failures.
    ./bin/test -vvc --layer='[^de]FunctionalLayer' -t TestCaptureOops -t canonical.testing.ftests

I discovered this after moving webapp to lp.services and got an error I could only reproduce by creating a similar test order.
I see that webapp tests are still played before the failing test (lp.services.webapp and lp.testing), I do not think the interaction problem is between webapp and testing, maybe this this webapp playing after other test?

======================================================================
FAILURE: lp.testing.tests.test_testcase.TestCaptureOops.test_two_oops_gives_two_details (subunit.RemotedTestCase)
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_StringException: Text attachment: traceback
------------
Traceback (most recent call last):
_StringException: oops-0: {{{
Oops-Id: OOPS-9fc00ba1b2ecd2e36ee745ce8b7c2a21
Exception-Type: AssertionError
Exception-Value: Exception to get a traceback.
Date: 2011-12-26T04:23:45.524505+00:00
Branch: test
Revision: 14602
Duration: -1
Oops-Reporter: T

Traceback (most recent call last):
  Module lp.testing.tests.test_testcase, line 77, in trigger_oops
    raise AssertionError("Exception to get a traceback.")
AssertionError: Exception to get a traceback.
}}}

Traceback (most recent call last):
  File "/var/launchpad/test/lib/lp/testing/tests/test_testcase.py", line 101, in test_two_oops_gives_two_details
    sorted([a for a in self.getDetails() if "oops" in a]))
AssertionError: ['oops-0', 'oops-1'] != ['oops-0']