Public bug reported:

apt-clone's tests have worked fine in wily
(http://autopkgtest.ubuntu.com/packages/a/apt-clone/wily/amd64/) but
started failing consistently in xenial
(http://autopkgtest.ubuntu.com/packages/a/apt-clone/xenial/amd64/).

This can be reproduced fast in a simple schroot with the test deps
installed:

$ cd tests; PYTHONPATH=.. python3 test_clone_upgrade.py -v 
TestCloneUpgrade.test_clone_upgrade_synthetic
[...]
======================================================================
FAIL: test_clone_upgrade_synthetic (__main__.TestCloneUpgrade)
test clone upgrade with on-the-fly generated chroots
----------------------------------------------------------------------
Traceback (most recent call last):
  File "test_clone_upgrade.py", line 58, in test_clone_upgrade_synthetic
    self.assertTrue(len(cache.get_changes()) > 0)
AssertionError: False is not true

I added
            print('--------- %s -----\n%s\n-------------' % (meta, 
cache.get_changes()))

to the test, and I get

--------- ubuntu-standard -----
[]
--------- ubuntu-desktop -----
[<Package: name:'libvisual-0.4-plugins' architecture='amd64' id:6857>]
--------- kubuntu-desktop -----
[<Package: name:'libvisual-0.4-plugins' architecture='amd64' id:6857>, 
<Package: name:'lksctp-tools' architecture='amd64' id:9362>]
--------- xubuntu-desktop -----
[<Package: name:'libvisual-0.4-plugins' architecture='amd64' id:6857>]
 
So the check works for the metapackages except ubuntu-standard. More curiously, 
when running the test on wily *now*, it also fails, which suggests that perhaps 
the very late distro-info update for xenial may have influenced this?

But I haven't the slightest idea what this test is trying to do, so I
don't know how to fix this.

** Affects: apt-clone (Ubuntu)
     Importance: High
     Assignee: Michael Vogt (mvo)
         Status: New

** Changed in: apt-clone (Ubuntu)
   Importance: Undecided => High

** Changed in: apt-clone (Ubuntu)
     Assignee: (unassigned) => Michael Vogt (mvo)

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https://bugs.launchpad.net/bugs/1510060

Title:
  test regression: TestCloneUpgrade.test_clone_upgrade_synthetic

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