autopkgtest: does not test installed package

[Martin Pitt]

The current autopkgtest fails during package build:

-- Detecting CXX compiler ABI info - done
CMake Error at /usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:108 (message):
  Could NOT find PkgConfig (missing: PKG_CONFIG_EXECUTABLE)
Call Stack (most recent call first):
  /usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:315 (_FPHSA_FAILURE_MESSAGE)
  /usr/share/cmake-2.8/Modules/FindPkgConfig.cmake:106 (find_package_handle_standard_args)
  CMakeLists.txt:23 (find_package)

See e. g. https://jenkins.qa.ubuntu.com/job/utopic-adt-ubuntuone-credentials/9/ARCH=i386,label=adt/console for the full log. But aside from this (which is probably just a missing build dependency, there's more problems:

 * The autopkgtest does not actually test anything, the test is empty. It should test that the *installed* ubuntu-purchase-service package works, testing the build tree does not help to spot missing files, missing or uninstallable dependencies, etc. At the moment it merely tests that the package is still buildable when dependencies change, which is certainly helpful but not the real purpose.

 * debian/tests/control could do with some cleanup and will need to be adjusted once there is an actual test. Right now, the only thing it really needs is "build-needed", everything else should go (i. e. empty "Depends:"). Please note that if you need to (partially or fully) build the package in the actual test (instead of through build-needed), you can avoid repeating the build dependencies by using @builddeps@.

Thanks!

(Pretty much the same as bug 1316415, for the record)

[Martin Pitt (pitti)]

The "fails" part is actually correct: the package is FTBFS in utopic, I filed that separately as bug 1318947. Retitling for the broken autopkgtest.