Difficulty obtaining Qt6 Quick Test via flake

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Hello,

I am currently developing a QML based application, and would like to use Qt Quick Test to test the GUI components. The only trouble is that Qt Quick Test is not included in qt6.qtbase or any of the other packages I have tried. For a little more reference, here is the flake.nix I have written so far (it’s short):

{
  inputs.nixpkgs.url = "github:nixos/nixpkgs";

  outputs = { self, nixpkgs }:
  let
    pkgs = nixpkgs.legacyPackages.x86_64-linux;
  in
  {
    devShells.x86_64-linux.default = pkgs.mkShell {
      buildInputs = with pkgs; [
        cmake
        curl

        qt6.qtbase
        qt6.qtquick3d
        qt6.qtcharts
        qt6.qtdeclarative
        qtcreator
        

        # Shellhook
        qt6.wrapQtAppsHook
        makeWrapper
        bashInteractive
      ];
      # Set environment variables
      shellHook = ''
        bashdir=$(mktemp -d)
        makeWrapper "$(type -p bash)" "$bashdir/bash" "''${qtWrapperArgs[@]}"
        exec "$bashdir/bash"
      '';
    };
  };
}

Any direction would be appreciated.