gcab: run & install tests

also add nixosTests.installed-tests.gcab for running the installed tests

pkgs/development/libraries/gcab/default.nix

@@ -13,19 +13,25 @@
 , glib
 , zlib
 , gnome3
+, nixosTests
 }:
 
 stdenv.mkDerivation rec {
   pname = "gcab";
   version = "1.3";
 
-  outputs = [ "bin" "out" "dev" "devdoc" ];
+  outputs = [ "bin" "out" "dev" "devdoc" "installedTests" ];
 
   src = fetchurl {
     url = "mirror://gnome/sources/${pname}/${stdenv.lib.versions.majorMinor version}/${pname}-${version}.tar.xz";
     sha256 = "1rv81b37d5ya7xpfdxrfk173jjcwabxyng7vafgwyl5myv44qc0h";
   };
 
+  patches = [
+    # allow installing installed tests to a separate output
+    ./installed-tests-path.patch
+  ];
+
   nativeBuildInputs = [
     meson
     ninja
@@ -45,14 +51,21 @@ stdenv.mkDerivation rec {
   ];
 
   mesonFlags = [
-    "-Dtests=false"
+    "-Dinstalled_tests=true"
+    "-Dinstalled_test_prefix=${placeholder ''installedTests''}"
   ];
 
+  doCheck = true;
+
   passthru = {
     updateScript = gnome3.updateScript {
       packageName = pname;
       versionPolicy = "none";
     };
+
+    tests = {
+      installedTests = nixosTests.installed-tests.gcab;
+    };
   };
 
   meta = with stdenv.lib; {