python-dbusmock: avoid eval error when missing test output of bluez

This fixes an evaluation error that occurs when we don’t have
bluez.test. getOutput defaults to "out" in these cases.

pkgs/development/python-modules/python-dbusmock/default.nix

@@ -44,12 +44,12 @@ buildPythonPackage rec {
 
   checkInputs = [
     nose dbus dbus-python which pycodestyle pyflakes
-    pygobject3 bluez bluez.test networkmanager
+    pygobject3 bluez (lib.getOutput "test" bluez) networkmanager
   ];
 
   checkPhase = ''
     runHook preCheck
-    export PATH="$PATH:${bluez.test}/test";
+    export PATH="$PATH:${lib.getOutput "test" bluez}/test";
     nosetests -v
     runHook postCheck
   '';