qt: reduce test closure

tests/modules/misc/qt/qt-basic.nix

@@ -1,5 +1,4 @@
 {
-  config = {
   qt.enable = true;
 
   nmt.script = ''
@@ -8,5 +7,4 @@
     assertFileRegex home-path/etc/profile.d/hm-session-vars.sh \
       'QML2_IMPORT_PATH'
   '';
-  };
 }

tests/modules/misc/qt/qt-platform-theme-gnome.nix

@@ -1,5 +1,4 @@
 {
-  config = {
   qt = {
     enable = true;
     # Check if still backwards compatible
@@ -7,7 +6,12 @@
     style.name = "adwaita";
   };
 
-    test.stubs.qgnomeplatform = { };
+  test.stubs = {
+    qgnomeplatform = { };
+    qgnomeplatform-qt6 = { };
+    adwaita-qt = { };
+    adwaita-qt6 = { };
+  };
 
   nmt.script = ''
     assertFileRegex home-path/etc/profile.d/hm-session-vars.sh \
@@ -23,5 +27,4 @@
     "The option `qt.platformTheme` has been renamed to `qt.platformTheme.name`."
     "The value `gnome` for option `qt.platformTheme` is deprecated. Use `adwaita` instead."
   ];
-  };
 }

tests/modules/misc/qt/qt-platform-theme-gtk.nix

@@ -1,11 +1,25 @@
 {
-  config = {
+  imports = [ ../../i18n/input-method/fcitx5-stubs.nix ];
+
   qt = {
     enable = true;
     platformTheme.name = "gtk";
   };
+
   i18n.inputMethod.enabled = "fcitx5";
 
+  nixpkgs.overlays = [
+    (final: prev: {
+      libsForQt5 = prev.libsForQt5.overrideScope (qt5final: qt5prev: {
+        qtstyleplugins = prev.mkStubPackage { outPath = null; };
+      });
+
+      qt6Packages = prev.qt6Packages.overrideScope (qt6final: qt6prev: {
+        qt6gtk2 = prev.mkStubPackage { outPath = null; };
+      });
+    })
+  ];
+
   nmt.script = ''
     assertFileRegex home-path/etc/profile.d/hm-session-vars.sh \
       'QT_QPA_PLATFORMTHEME="gtk2"'
@@ -14,5 +28,4 @@
     assertFileRegex home-path/etc/profile.d/hm-session-vars.sh \
       'QML2_IMPORT_PATH'
   '';
-  };
 }

tests/modules/misc/qt/qt-platform-theme-gtk3.nix

@@ -1,5 +1,4 @@
 {
-  config = {
   qt = {
     enable = true;
     platformTheme.name = "gtk3";
@@ -13,5 +12,4 @@
     assertFileRegex home-path/etc/profile.d/hm-session-vars.sh \
       'QML2_IMPORT_PATH'
   '';
-  };
 }