gjs: fix installed test paths

libgimarshallingtests references gobject-introspection.dev bloating the
closure.

pkgs/development/libraries/gjs/default.nix

@@ -1,4 +1,5 @@
 { fetchurl
+, fetchpatch
 , stdenv
 , meson
 , ninja
@@ -16,10 +17,16 @@
 , dbus
 , gdk-pixbuf
 , makeWrapper
+, xvfb_run
 , nixosTests
 }:
 
-stdenv.mkDerivation rec {
+let
+  testDeps = [
+    gobject-introspection # for Gio and cairo typelibs
+    gtk3 atk pango.out gdk-pixbuf
+  ];
+in stdenv.mkDerivation rec {
   pname = "gjs";
   version = "1.64.0";
 
@@ -46,26 +53,80 @@ stdenv.mkDerivation rec {
     dbus # for dbus-run-session
   ];
 
+  checkInputs = [
+    xvfb_run
+  ] ++ testDeps;
+
   propagatedBuildInputs = [
     glib
   ];
 
   mesonFlags = [
     "-Dprofiler=disabled"
+    "-Dinstalled_test_prefix=${placeholder "installedTests"}"
   ];
 
+  patches = [
+    # Hard-code various paths
+    ./fix-paths.patch
+
+    # Clean-ups to make installing installed tests separately easier.
+    # https://gitlab.gnome.org/GNOME/gjs/merge_requests/403
+    (fetchpatch {
+      url = "https://gitlab.gnome.org/GNOME/gjs/commit/14bae0e2bc7e817f53f0dcd8ecd032f554d12e6f.patch";
+      sha256 = "4eaNl2ddRMlUfBoOUnRy10+RlQR4f/mDMhjQ2txmRcg=";
+    })
+    (fetchpatch {
+      url = "https://gitlab.gnome.org/GNOME/gjs/commit/075f015d7980dc94fff48a1c4021cb50691dddb1.patch";
+      sha256 = "Iw0XfGiOUazDbpT5SqFx3UVvBRtNm3Fds1gCsdxKucw=";
+    })
+    (fetchpatch {
+      url = "https://gitlab.gnome.org/GNOME/gjs/commit/5cfd2c2ffd2d8c002d40f658e1c54027dc5d8506.patch";
+      sha256 = "rJ5Je1zcfthIl7+hRoWw3cwzz/ZkS2rtjvFOQ8znBi8=";
+    })
+    (fetchpatch {
+      url = "https://gitlab.gnome.org/GNOME/gjs/commit/1a81f40e8783fe97dd00f009eb0d9ad45297e831.patch";
+      sha256 = "+k4Xv3sJ//iDqkVTkO51IA7FPtWsS0P9YUVTWnIym4I=";
+    })
+    (fetchpatch {
+      url = "https://gitlab.gnome.org/GNOME/gjs/commit/361a319789310292787d9c62665cef9e386a9b20.patch";
+      sha256 = "ofOP1OFs9q5nW9rE/2ovbwZR6gTrDDh8cczdYipoWNE=";
+    })
+
+    # Allow installing installed tests to a separate output.
+    ./installed-tests-path.patch
+  ];
+
+  # Gio test is failing
+  # https://github.com/NixOS/nixpkgs/pull/81626#issuecomment-599325843
+  doCheck = false;
+
   postPatch = ''
-    for f in installed-tests/*.test.in; do
-      substituteInPlace "$f" --subst-var-by pkglibexecdir "$installedTests/libexec/gjs"
-    done
+    substituteInPlace installed-tests/debugger-test.sh --subst-var-by gjsConsole $out/bin/gjs-console
+  '';
+
+  preCheck = ''
+    # Our gobject-introspection patches make the shared library paths absolute
+    # in the GIR files. When running tests, the library is not yet installed,
+    # though, so we need to replace the absolute path with a local one during build.
+    # We are using a symlink that will be overridden during installation.
+    mkdir -p $out/lib $installedTests/libexec/gjs/installed-tests
+    ln -s $PWD/libgjs.so.0 $out/lib/libgjs.so.0
+    ln -s $PWD/installed-tests/js/libgimarshallingtests.so $installedTests/libexec/gjs/installed-tests/libgimarshallingtests.so
+    ln -s $PWD/installed-tests/js/libregress.so $installedTests/libexec/gjs/installed-tests/libregress.so
+    ln -s $PWD/installed-tests/js/libwarnlib.so $installedTests/libexec/gjs/installed-tests/libwarnlib.so
   '';
 
   postInstall = ''
-    moveToOutput "share/installed-tests" "$installedTests"
-    moveToOutput "libexec/gjs/installed-tests" "$installedTests"
-
     wrapProgram "$installedTests/libexec/gjs/installed-tests/minijasmine" \
-      --prefix GI_TYPELIB_PATH : "${stdenv.lib.makeSearchPath "lib/girepository-1.0" [ gtk3 atk pango.out gdk-pixbuf ]}:$installedTests/libexec/gjs/installed-tests"
+      --prefix GI_TYPELIB_PATH : "${stdenv.lib.makeSearchPath "lib/girepository-1.0" testDeps}"
+  '';
+
+  checkPhase = ''
+    runHook preCheck
+    xvfb-run -s '-screen 0 800x600x24' \
+      meson test --print-errorlogs
+    runHook postCheck
   '';
 
   separateDebugInfo = stdenv.isLinux;