This option provides a more convenient way to overlay dummy packages.
It also adds a function `config.lib.test.mkStubPackage` that can,
e.g., be used for `package` options.
This allows you to set a theme for Qt applications. For example, if you
want to use `adwaita-qt` theme to have uniform look between Gtk and Qt
applications, you can use it like this:
```nix
{
qt = {
enable = true;
platformTheme = "gnome";
style = {
name = "adwaita";
package = pkgs.adwaita-qt;
};
};
}
```
