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[Launchpad Bug Tracker <1425721@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package autopilot -
1.5.1+15.10.20150723-0ubuntu1

---------------
autopilot (1.5.1+15.10.20150723-0ubuntu1) wily; urgency=medium

  [ Christopher Lee ]
  * Bug fixes including updated dependencies.

  [ Ken VanDine ]
  * Bug fixes including updated dependencies.

 -- CI Train Bot <ci-train-bot@xxxxxxxxxxxxx>  Thu, 23 Jul 2015 14:39:21
+0000

** Changed in: autopilot (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1425721

Title:
  Extension classes with multiple base classes aren't merged correctly.

Status in Autopilot:
  Fix Released
Status in autopilot package in Ubuntu:
  Fix Released
Status in autopilot source package in Vivid:
  Fix Released

Bug description:
  Related to this bug: lp:1376996  where the fix for that introduced
  other issues for existing application test cases this code needs to be
  fixed so this aforementioned bug is fixed completely.

  The actual bug is that the extension classes aren't applied in the call to `_try_custom_proxy_classes`, the initial fix (now reverted) attempted this but this introduced unforeseen errors when running all the application tests. A further quick fix was attempted (effectively:
    base + tuple(set(extensions).difference(base))
  )
  But this introduced other errors and at that point the quick fix was no longer quick.

  
  [Impact]

   * It is possible that a test authors tests fail intermittently due to
  the base classes of a cpo not being resolved correctly and thus added
  methods etc. are not available (resulting in an attribute failure).

   * justification: Ensures that test author tests for applications have
  a decreased likelihood of failing

   * This fix improves the handling of the what is expected when using a
  custom proxy object and is stricter in what it allows.

  [Test Case]

   * To reproduce this bug:
      - Install the current python3-autopilot (apt-get install python3-autopilot python-windowmocker)
      - run this test (using the following command):
        $ python3 -m autopilot.run run autopilot.tests.functional.test_introspection_features.IntrospectionFeatureTests.test_customised_proxy_classes_have_extension_classes

  [Regression Potential]

   * Changes to the existing core app autopilot tests have been landed,
  otherwise there would be a potential regression where tests start
  failing with an exception [1].

  [1] ValueError with the message starting: "base_class: {passed} does
  not appear to be the actual base CPO class."

   * This change has been tested against the existing core app tests
  (Using a jenkins job similar to the smokeeng dash board) where all the
  tests are run. The results are inspected.

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