beets: Re-enable tests

The reason why the completion tests didn't pass was because we had it
already disabled in 2acc258dff.

Meanwhile, beetbox/beets@a07cb83 has moved the file from
test/test_completion.sh to test/rsrc/test_completion.sh.

So this has silently re-enabled the completion tests, which we need to
investigate on our side why they failed in the first place.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

pkgs/tools/audio/beets/default.nix

@@ -121,7 +121,7 @@ in buildPythonPackage rec {
 
   postPatch = ''
     sed -i -e '/assertIn.*item.*path/d' test/test_info.py
-    echo echo completion tests passed > test/test_completion.sh
+    echo echo completion tests passed > test/rsrc/test_completion.sh
 
     sed -i -e '/^BASH_COMPLETION_PATHS *=/,/^])$/ {
       /^])$/i u"${completion}"
@@ -139,7 +139,7 @@ in buildPythonPackage rec {
       test/test_replaygain.py
   '';
 
-  doCheck = false; # TODO, see https://github.com/beetbox/beets/issues/1876#issuecomment-182010438
+  doCheck = true;
 
   preCheck = ''
     (${concatMapStrings (s: "echo \"${s}\";") allPlugins}) \