tests: add option test.stubs

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.

tests/default.nix

@@ -26,10 +26,13 @@ let
       # unnecessary rebuilds of the tests.
       manual.manpages.enable = false;
 
-      imports = [ ./asserts.nix ];
+      imports = [ ./asserts.nix ./stubs.nix ];
     }
   ];
 
+  isDarwin = pkgs.stdenv.hostPlatform.isDarwin;
+  isLinux = pkgs.stdenv.hostPlatform.isLinux;
+
 in
 
 import nmt {
@@ -89,12 +92,11 @@ import nmt {
     ./modules/programs/zplug
     ./modules/programs/zsh
     ./modules/xresources
-  ] ++ lib.optionals pkgs.stdenv.hostPlatform.isDarwin [
+  ] ++ lib.optionals isDarwin [
     ./modules/targets-darwin
-  ] ++ lib.optionals pkgs.stdenv.hostPlatform.isLinux [
+  ] ++ lib.optionals isLinux [
     ./modules/config/i18n
     ./modules/i18n/input-method
-    ./modules/misc/debug
     ./modules/misc/gtk
     ./modules/misc/numlock
     ./modules/misc/pam
@@ -103,7 +105,6 @@ import nmt {
     ./modules/misc/xsession
     ./modules/programs/abook
     ./modules/programs/autorandr
-    ./modules/programs/firefox
     ./modules/programs/foot
     ./modules/programs/getmail
     ./modules/programs/gnome-terminal
@@ -142,5 +143,8 @@ import nmt {
     ./modules/targets-linux
   ] ++ lib.optionals enableBig [
     ./modules/programs/emacs
+  ] ++ lib.optionals (enableBig && isLinux) [
+    ./modules/misc/debug
+    ./modules/programs/firefox
   ]);
 }

tests/modules/i18n/input-method/fcitx5-configuration.nix

@@ -1,15 +1,14 @@
 { config, pkgs, ... }:
 
 {
-  config = {
+  imports = [ ./fcitx5-stubs.nix ];
-    nixpkgs.overlays = [ (import ./fcitx5-overlay.nix) ];
-    i18n.inputMethod = {
-      enabled = "fcitx5";
-      fcitx5.addons = with pkgs; [ fcitx5-chinese-addons ];
-    };
 
-    nmt.script = ''
+  i18n.inputMethod = {
-      assertFileExists home-files/.config/systemd/user/fcitx5-daemon.service
+    enabled = "fcitx5";
-    '';
+    fcitx5.addons = with pkgs; [ fcitx5-chinese-addons ];
   };
+
+  nmt.script = ''
+    assertFileExists home-files/.config/systemd/user/fcitx5-daemon.service
+  '';
 }

tests/modules/i18n/input-method/fcitx5-overlay.nix

@@ -1,22 +0,0 @@
-final: prev:
-
-let
-
-  dummy = prev.runCommandLocal "dummy-package" { } "mkdir $out";
-
-in {
-  fcitx5 = prev.runCommandLocal "fcitx5" { version = "0"; } ''
-    mkdir -p $out/bin $out/share/applications $out/etc/xdg/autostart
-    touch $out/bin/fcitx5 \
-          $out/share/applications/org.fcitx.Fcitx5.desktop \
-          $out/etc/xdg/autostart/org.fcitx.Fcitx5.desktop
-    chmod +x $out/bin/fcitx5
-  '';
-  fcitx5-configtool = dummy;
-  fcitx5-lua = dummy;
-  fcitx5-qt = dummy;
-  fcitx5-gtk = dummy;
-  fcitx5-with-addons =
-    prev.fcitx5-with-addons.override { inherit (final) fcitx5-qt; };
-  fcitx5-chinese-addons = dummy;
-}

tests/modules/i18n/input-method/fcitx5-stubs.nix

@@ -0,0 +1,27 @@
+{
+  test.stubs = {
+    fcitx5 = {
+      version = "0";
+      outPath = null;
+      buildScript = ''
+        mkdir -p $out/bin $out/share/applications $out/etc/xdg/autostart
+        touch $out/bin/fcitx5 \
+              $out/share/applications/org.fcitx.Fcitx5.desktop \
+              $out/etc/xdg/autostart/org.fcitx.Fcitx5.desktop
+        chmod +x $out/bin/fcitx5
+      '';
+    };
+    fcitx5-configtool = { outPath = null; };
+    fcitx5-lua = { outPath = null; };
+    fcitx5-qt = { outPath = null; };
+    fcitx5-gtk = { outPath = null; };
+    fcitx5-chinese-addons = { outPath = null; };
+  };
+
+  nixpkgs.overlays = [
+    (self: super: {
+      fcitx5-with-addons =
+        super.fcitx5-with-addons.override { inherit (self) fcitx5-qt; };
+    })
+  ];
+}

tests/modules/misc/gtk/gtk2-basic-config.nix

@@ -9,6 +9,8 @@ with lib;
       gtk2.extraConfig = "gtk-can-change-accels = 1";
     };
 
+    test.stubs.dconf = { };
+
     nmt.script = ''
       assertFileExists home-files/.gtkrc-2.0
       assertFileContent home-files/.gtkrc-2.0 ${

tests/modules/misc/gtk/gtk2-config-file-location.nix

@@ -7,6 +7,8 @@ with lib;
     gtk.enable = true;
     gtk.gtk2.configLocation = "${config.xdg.configHome}/gtk-2.0/gtkrc";
 
+    test.stubs.dconf = { };
+
     nmt.script = ''
       assertFileExists home-files/.config/gtk-2.0/gtkrc
       assertFileRegex home-path/etc/profile.d/hm-session-vars.sh \

tests/modules/misc/numlock/numlock.nix

@@ -6,9 +6,7 @@ with lib;
   config = {
     xsession.numlock.enable = true;
 
-    nixpkgs.overlays = [
+    test.stubs.numlockx = { };
-      (self: super: { numlockx = pkgs.writeScriptBin "dummy-numlockx" ""; })
-    ];
 
     nmt.script = ''
       serviceFile=home-files/.config/systemd/user/numlockx.service

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

@@ -7,15 +7,11 @@
       platformTheme = "gnome";
       style = {
         name = "adwaita";
-        package = pkgs.dummyTheme;
+        package = config.lib.test.mkStubPackage { };
       };
     };
 
-    nixpkgs.overlays = [
+    test.stubs.qgnomeplatform = { };
-      (self: super: {
-        dummyTheme = pkgs.runCommandLocal "theme" { } "mkdir $out";
-      })
-    ];
 
     nmt.script = ''
       assertFileRegex home-path/etc/profile.d/hm-session-vars.sh \

tests/modules/programs/abook/no-settings.nix

@@ -6,8 +6,7 @@ with lib;
   config = {
     programs.abook.enable = true;
 
-    nixpkgs.overlays =
+    test.stubs.abook = { };
-      [ (self: super: { abook = pkgs.writeScriptBin "dummy-abook" ""; }) ];
 
     nmt.script = ''
       assertPathNotExists home-files/.config/abook/abookrc

tests/modules/programs/abook/with-settings.nix

@@ -28,8 +28,7 @@ with lib;
       '';
     };
 
-    nixpkgs.overlays =
+    test.stubs.abook = { };
-      [ (self: super: { abook = pkgs.writeScriptBin "dummy-abook" ""; }) ];
 
     nmt.script = ''
       assertFileExists home-files/.config/abook/abookrc

tests/modules/programs/alacritty/empty-settings.nix

@@ -6,9 +6,7 @@ with lib;
   config = {
     programs.alacritty.enable = true;
 
-    nixpkgs.overlays = [
+    test.stubs.alacritty = { };
-      (self: super: { alacritty = pkgs.writeScriptBin "dummy-alacritty" ""; })
-    ];
 
     nmt.script = ''
       assertPathNotExists home-files/.config/alacritty

tests/modules/programs/alacritty/example-settings.nix

@@ -6,7 +6,7 @@ with lib;
   config = {
     programs.alacritty = {
       enable = true;
-      package = pkgs.writeScriptBin "dummy-alacritty" "";
+      package = config.lib.test.mkStubPackage { };
 
       settings = {
         window.dimensions = {

tests/modules/programs/alacritty/settings-merging.nix

@@ -6,7 +6,7 @@ with lib;
   config = {
     programs.alacritty = {
       enable = true;
-      package = pkgs.writeScriptBin "dummy-alacritty" "";
+      package = config.lib.test.mkStubPackage { };
 
       settings = {
         window.dimensions = {

tests/modules/programs/alot/alot.nix

@@ -23,8 +23,7 @@ with lib;
 
     programs.alot = { enable = true; };
 
-    nixpkgs.overlays =
+    test.stubs.alot = { };
-      [ (self: super: { alot = pkgs.writeScriptBin "dummy-alot" ""; }) ];
 
     nmt.script = ''
       assertFileExists home-files/.config/alot/config

tests/modules/programs/aria2/settings.nix

@@ -20,8 +20,7 @@ with lib;
       '';
     };
 
-    nixpkgs.overlays =
+    test.stubs.aria2 = { };
-      [ (self: super: { aria2 = pkgs.writeScriptBin "dummy-aria2" ""; }) ];
 
     nmt.script = ''
       assertFileContent \

tests/modules/programs/autojump/default-settings.nix

@@ -6,6 +6,10 @@ with lib;
   config = {
     programs.autojump.enable = true;
 
+    test.stubs.autojump = {
+      buildScript = "mkdir -p $out/bin; touch $out/bin/autojump";
+    };
+
     nmt.script = ''
       assertFileExists home-path/bin/autojump
     '';

tests/modules/programs/autorandr/basic-configuration.nix

@@ -28,6 +28,8 @@
       };
     };
 
+    test.stubs.autorandr = { };
+
     nmt.script = ''
       config=home-files/.config/autorandr/default/config
       setup=home-files/.config/autorandr/default/setup

tests/modules/programs/autorandr/scale.nix

@@ -17,6 +17,8 @@
       };
     };
 
+    test.stubs.autorandr = { };
+
     nmt.script = ''
       config=home-files/.config/autorandr/default/config
 

tests/modules/programs/bat/bat.nix

@@ -18,8 +18,7 @@ with lib;
       '';
     };
 
-    nixpkgs.overlays =
+    test.stubs.bat = { };
-      [ (self: super: { bat = pkgs.writeScriptBin "dummy" ""; }) ];
 
     nmt.script = ''
       assertFileExists home-files/.config/bat/config

tests/modules/programs/bottom/empty-settings.nix

@@ -6,7 +6,7 @@ with lib;
   config = {
     programs.bottom = {
       enable = true;
-      package = pkgs.writeScriptBin "dummy" "";
+      package = config.lib.test.mkStubPackage { };
     };
 
     nmt.script = ''

tests/modules/programs/bottom/example-settings.nix

@@ -6,7 +6,7 @@ with lib;
   config = {
     programs.bottom = {
       enable = true;
-      package = pkgs.writeShellScriptBin "dummy" "";
+      package = config.lib.test.mkStubPackage { };
 
       settings = {
         flags = {

tests/modules/programs/broot/broot.nix

@@ -9,8 +9,7 @@ with lib;
       modal = true;
     };
 
-    nixpkgs.overlays =
+    test.stubs.broot = { };
-      [ (self: super: { broot = pkgs.writeScriptBin "dummy" ""; }) ];
 
     nmt.script = ''
       assertFileExists home-files/.config/broot/conf.toml

tests/modules/programs/feh/feh-bindings.nix

@@ -17,8 +17,7 @@
       prev_img = [ "h" "Left" ];
     };
 
-    nixpkgs.overlays =
+    test.stubs.feh = { };
-      [ (self: super: { feh = pkgs.writeScriptBin "dummy-feh" ""; }) ];
 
     nmt.script = ''
       assertFileContent \

tests/modules/programs/feh/feh-empty-settings.nix

@@ -4,8 +4,7 @@
   config = {
     programs.feh.enable = true;
 
-    nixpkgs.overlays =
+    test.stubs.feh = { };
-      [ (self: super: { feh = pkgs.writeScriptBin "dummy-feh" ""; }) ];
 
     nmt.script = ''
       assertPathNotExists home-files/.config/feh/buttons

tests/modules/programs/fish/functions.nix

@@ -34,8 +34,7 @@ in {
     xdg.dataFile."fish/home-manager_generated_completions".source =
       lib.mkForce (builtins.toFile "empty" "");
 
-    nixpkgs.overlays =
+    test.stubs.fish = { };
-      [ (self: super: { fish = pkgs.writeScriptBin "dummy" ""; }) ];
 
     nmt = {
       description =

tests/modules/programs/fish/no-functions.nix

@@ -14,8 +14,7 @@ with lib;
     xdg.dataFile."fish/home-manager_generated_completions".source =
       lib.mkForce (builtins.toFile "empty" "");
 
-    nixpkgs.overlays =
+    test.stubs.fish = { };
-      [ (self: super: { fish = pkgs.writeScriptBin "dummy" ""; }) ];
 
     nmt = {
       description =

tests/modules/programs/fish/plugins.nix

@@ -50,8 +50,7 @@ in {
     xdg.dataFile."fish/home-manager_generated_completions".source =
       lib.mkForce (builtins.toFile "empty" "");
 
-    nixpkgs.overlays =
+    test.stubs.fish = { };
-      [ (self: super: { fish = pkgs.writeScriptBin "dummy" ""; }) ];
 
     nmt = {
       description =

tests/modules/programs/foot/empty-settings.nix

@@ -6,8 +6,7 @@ with lib;
   config = {
     programs.foot.enable = true;
 
-    nixpkgs.overlays =
+    test.stubs.foot = { };
-      [ (self: super: { foot = pkgs.writeScriptBin "dummy-foot" ""; }) ];
 
     nmt.script = ''
       assertPathNotExists home-files/.config/foot

tests/modules/programs/foot/example-settings.nix

@@ -6,7 +6,7 @@ with lib;
   config = {
     programs.foot = {
       enable = true;
-      package = pkgs.writeShellScriptBin "dummy-foot" "";
+      package = config.lib.test.mkStubPackage { };
 
       settings = {
         main = {

tests/modules/programs/foot/systemd-user-service.nix

@@ -1,11 +1,9 @@
 { config, lib, pkgs, ... }:
 
-let
+{
-  package = pkgs.writeShellScriptBin "dummy-foot" "" // { outPath = "@foot@"; };
-in {
   config = {
     programs.foot = {
-      inherit package;
+      package = config.lib.test.mkStubPackage { outPath = "@foot@"; };
       enable = true;
       server.enable = true;
     };

tests/modules/programs/gh/config-file.nix

@@ -8,8 +8,7 @@
       editor = "vim";
     };
 
-    nixpkgs.overlays =
+    test.stubs.gh = { };
-      [ (self: super: { gh = pkgs.writeScriptBin "dummy-gh" ""; }) ];
 
     nmt.script = ''
       assertFileExists home-files/.config/gh/config.yml

tests/modules/programs/git/git.nix

@@ -79,14 +79,10 @@ in {
       }
     ];
 
-    nixpkgs.overlays = [
+    test.stubs = {
-      (self: super: {
+      git-lfs = { };
-        git-lfs = pkgs.writeScriptBin "dummy-git-lfs" "";
+      delta = { };
-        delta = pkgs.writeScriptBin "dummy-delta" "" // {
+    };
-          outPath = "@delta@";
-        };
-      })
-    ];
 
     nmt.script = ''
       assertFileExists home-files/.config/git/config

tests/modules/programs/gnome-terminal/gnome-terminal-1.nix

@@ -4,13 +4,6 @@ with lib;
 
 {
   config = {
-    nixpkgs.overlays = [
-      (self: super: {
-        gnome.gnome-terminal =
-          pkgs.writeScriptBin "dummy-gnome3-gnome-terminal" "";
-      })
-    ];
-
     programs.gnome-terminal = {
       enable = true;
       profile = {
@@ -55,6 +48,14 @@ with lib;
       showMenubar = false;
     };
 
+    nixpkgs.overlays = [
+      (self: super: {
+        gnome.gnome-terminal = config.lib.test.mkStubPackage { };
+      })
+    ];
+
+    test.stubs.dconf = { };
+
     nmt.script = ''
       dconfIni=$(grep -oPm 1 '/nix/store/[a-z0-9]*?-hm-dconf.ini' $TESTED/activate)
       assertFileContent $dconfIni ${./gnome-terminal-1.conf}

tests/modules/programs/himalaya/himalaya.nix

@@ -5,34 +5,31 @@ with lib;
 {
   imports = [ ../../accounts/email-test-accounts.nix ];
 
-  config = {
+  accounts.email.accounts = {
-    accounts.email.accounts = {
+    "hm@example.com" = {
-      "hm@example.com" = {
+      himalaya = {
-        himalaya = {
+        enable = true;
-          enable = true;
 
-          settings = { default-page-size = 50; };
+        settings = { default-page-size = 50; };
-        };
-
-        imap.port = 995;
-        smtp.port = 465;
       };
+
+      imap.port = 995;
+      smtp.port = 465;
     };
-
-    programs.himalaya = {
-      enable = true;
-      settings = { downloads-dir = "/data/download"; };
-    };
-
-    nixpkgs.overlays =
-      [ (self: super: { himalaya = pkgs.writeScriptBin "dummy-alot" ""; }) ];
-
-    nmt.script = ''
-      assertFileExists home-files/.config/himalaya/config.toml
-      assertFileContent home-files/.config/himalaya/config.toml ${
-        ./himalaya-expected.toml
-      }
-    '';
   };
+
+  programs.himalaya = {
+    enable = true;
+    settings = { downloads-dir = "/data/download"; };
+  };
+
+  test.stubs.himalaya = { };
+
+  nmt.script = ''
+    assertFileExists home-files/.config/himalaya/config.toml
+    assertFileContent home-files/.config/himalaya/config.toml ${
+      ./himalaya-expected.toml
+    }
+  '';
 }
 

tests/modules/programs/htop/empty-settings.nix

@@ -6,8 +6,7 @@ with lib;
   config = {
     programs.htop.enable = true;
 
-    nixpkgs.overlays =
+    test.stubs.htop = { };
-      [ (self: super: { htop = pkgs.writeScriptBin "dummy" ""; }) ];
 
     nmt.script = ''
       assertPathNotExists home-files/.config/htop

tests/modules/programs/htop/example-settings.nix

@@ -36,8 +36,7 @@ with lib;
           (text "Systemd")
         ]);
 
-    nixpkgs.overlays =
+    test.stubs.htop = { };
-      [ (self: super: { htop = pkgs.writeScriptBin "dummy" ""; }) ];
 
     nmt.script = ''
       htoprc=home-files/.config/htop/htoprc

tests/modules/programs/htop/settings-without-fields.nix

@@ -7,8 +7,7 @@ with lib;
     programs.htop.enable = true;
     programs.htop.settings = { color_scheme = 6; };
 
-    nixpkgs.overlays =
+    test.stubs.htop = { };
-      [ (self: super: { htop = pkgs.writeScriptBin "dummy" ""; }) ];
 
     # Test that the 'fields' key is written in addition to the customized
     # settings or htop won't read the options.

tests/modules/programs/i3status-rust/with-custom.nix

@@ -92,11 +92,7 @@ with lib;
       };
     };
 
-    nixpkgs.overlays = [
+    test.stubs.i3status-rust = { };
-      (self: super: {
-        i3status-rust = pkgs.writeScriptBin "dummy-i3status-rust" "";
-      })
-    ];
 
     nmt.script = ''
       assertFileExists home-files/.config/i3status-rust/config-custom.toml

tests/modules/programs/i3status-rust/with-default.nix

@@ -6,11 +6,7 @@ with lib;
   config = {
     programs.i3status-rust = { enable = true; };
 
-    nixpkgs.overlays = [
+    test.stubs.i3status-rust = { };
-      (self: super: {
-        i3status-rust = pkgs.writeScriptBin "dummy-i3status-rust" "";
-      })
-    ];
 
     nmt.script = ''
       assertFileExists home-files/.config/i3status-rust/config-default.toml

tests/modules/programs/i3status-rust/with-extra-settings.nix

@@ -102,11 +102,7 @@ with lib;
       };
     };
 
-    nixpkgs.overlays = [
+    test.stubs.i3status-rust = { };
-      (self: super: {
-        i3status-rust = pkgs.writeScriptBin "dummy-i3status-rust" "";
-      })
-    ];
 
     nmt.script = ''
       assertFileExists home-files/.config/i3status-rust/config-extra-settings.toml 

tests/modules/programs/i3status-rust/with-multiple-bars.nix

@@ -52,11 +52,7 @@ with lib;
 
     };
 
-    nixpkgs.overlays = [
+    test.stubs.i3status-rust = { };
-      (self: super: {
-        i3status-rust = pkgs.writeScriptBin "dummy-i3status-rust" "";
-      })
-    ];
 
     nmt.script = ''
       assertFileExists home-files/.config/i3status-rust/config-top.toml

tests/modules/programs/i3status/with-custom.nix

@@ -32,9 +32,7 @@ with lib;
       };
     };
 
-    nixpkgs.overlays = [
+    test.stubs.i3status = { };
-      (self: super: { i3status = pkgs.writeScriptBin "dummy-i3status" ""; })
-    ];
 
     nmt.script = ''
       assertFileContent \

tests/modules/programs/i3status/with-default.nix

@@ -9,9 +9,7 @@ with lib;
       enableDefault = true;
     };
 
-    nixpkgs.overlays = [
+    test.stubs.i3status = { };
-      (self: super: { i3status = pkgs.writeScriptBin "dummy-i3status" ""; })
-    ];
 
     nmt.script = ''
       assertFileContent \

tests/modules/programs/irsii/example-settings.nix

@@ -19,13 +19,12 @@ with lib;
       };
     };
 
+    test.stubs.irsii = { };
+
     nmt.script = ''
       assertFileContent \
         home-files/.irssi/config \
         ${./example-settings-expected.config}
     '';
-
-    nixpkgs.overlays =
-      [ (self: super: { irsii = pkgs.writeScriptBin "dummy-irsii" ""; }) ];
   };
 }

tests/modules/programs/kitty/example-settings.nix

@@ -30,8 +30,7 @@ with lib;
       environment = { LS_COLORS = "1"; };
     };
 
-    nixpkgs.overlays =
+    test.stubs.kitty = { };
-      [ (self: super: { kitty = pkgs.writeScriptBin "dummy-kitty" ""; }) ];
 
     nmt.script = ''
       assertFileExists home-files/.config/kitty/kitty.conf

tests/modules/programs/lf/all-options.nix

@@ -75,8 +75,7 @@ in {
       };
     };
 
-    nixpkgs.overlays =
+    test.stubs.lf = { };
-      [ (self: super: { lf = pkgs.writeScriptBin "dummy-lf" ""; }) ];
 
     nmt.script = ''
       assertFileExists home-files/.config/lf/lfrc

tests/modules/programs/lf/minimal-options.nix

@@ -7,8 +7,7 @@ in {
   config = {
     programs.lf = { enable = true; };
 
-    nixpkgs.overlays =
+    test.stubs.lf = { };
-      [ (self: super: { lf = pkgs.writeScriptBin "dummy-lf" ""; }) ];
 
     nmt.script = ''
       assertFileExists home-files/.config/lf/lfrc

tests/modules/programs/lf/no-pv-keybind.nix

@@ -32,8 +32,7 @@ in {
       previewer = { source = pvScript; };
     };
 
-    nixpkgs.overlays =
+    test.stubs.lf = { };
-      [ (self: super: { lf = pkgs.writeScriptBin "dummy-lf" ""; }) ];
 
     nmt.script = ''
       assertFileExists home-files/.config/lf/lfrc

tests/modules/programs/lieer/lieer.nix

@@ -7,7 +7,7 @@ with lib;
 
   config = {
     programs.lieer.enable = true;
-    programs.lieer.package = pkgs.writeScriptBin "dummy-gmailieer" "";
+    programs.lieer.package = config.lib.test.mkStubPackage { };
 
     accounts.email.accounts."hm@example.com" = {
       flavor = "gmail.com";

tests/modules/programs/mangohud/basic-configuration.nix

@@ -4,7 +4,7 @@
   config = {
     programs.mangohud = {
       enable = true;
-      package = pkgs.writeScriptBin "dummy-mangohud" "";
+      package = config.lib.test.mkStubPackage { };
       settings = {
         output_folder = /home/user/Documents/mangohud;
         fps_limit = [ 30 60 ];

tests/modules/programs/mpv/mpv-example-settings.nix

@@ -29,9 +29,7 @@
       defaultProfiles = [ "gpu-hq" ];
     };
 
-    nixpkgs.overlays = [
+    test.stubs.mpvDummy = { };
-      (self: super: { mpvDummy = pkgs.runCommandLocal "mpv" { } "mkdir $out"; })
-    ];
 
     nmt.script = ''
       assertFileContent \

tests/modules/programs/mpv/mpv-invalid-settings.nix

@@ -22,7 +22,7 @@
           touch $out/bin/{,u}mpv $out/Applications/mpv.app/Contents/MacOS/mpv
           chmod 755 $out/bin/{,u}mpv $out/Applications/mpv.app/Contents/MacOS/mpv
         '';
-        mpvDummy = pkgs.runCommandLocal "mpv" { } "mkdir $out";
+        mpvDummy = config.lib.test.mkStubPackage { };
         mpvScript =
           pkgs.runCommandLocal "mpvScript" { scriptName = "something"; }
           "mkdir $out";

tests/modules/programs/ncmpcpp-linux/ncmpcpp-use-mpd-config.nix

@@ -7,12 +7,10 @@
     services.mpd.enable = true;
     services.mpd.musicDirectory = "/home/user/music";
 
-    nixpkgs.overlays = [
+    test.stubs = {
-      (self: super: {
+      ncmpcpp = { };
-        ncmpcpp = pkgs.writeScriptBin "dummy-ncmpcpp" "";
+      mpd = { };
-        mpd = pkgs.writeScriptBin "dummy-mpd" "";
+    };
-      })
-    ];
 
     nmt.script = ''
       assertFileContent \

tests/modules/programs/ncmpcpp/ncmpcpp-empty-settings.nix

@@ -4,8 +4,7 @@
   config = {
     programs.ncmpcpp.enable = true;
 
-    nixpkgs.overlays =
+    test.stubs.ncmpcpp = { };
-      [ (self: super: { ncmpcpp = pkgs.writeScriptBin "dummy-ncmpcpp" ""; }) ];
 
     nmt.script = ''
       assertPathNotExists home-files/.config/ncmpcpp/config

tests/modules/programs/ncmpcpp/ncmpcpp-example-settings.nix

@@ -44,8 +44,7 @@
       ];
     };
 
-    nixpkgs.overlays =
+    test.stubs.ncmpcpp = { };
-      [ (self: super: { ncmpcpp = pkgs.writeScriptBin "dummy-ncmpcpp" ""; }) ];
 
     nmt.script = ''
       assertFileContent \

tests/modules/programs/ne/defprefs.nix

@@ -19,8 +19,7 @@ in {
       automaticPreferences.".default" = autopref;
     };
 
-    nixpkgs.overlays =
+    test.stubs.ne = { };
-      [ (self: super: { ne = pkgs.writeScriptBin "dummy-ne" ""; }) ];
 
     nmt = {
       description =

tests/modules/programs/ne/passthroughs.nix

@@ -53,8 +53,7 @@ in {
       inherit automaticPreferences;
     };
 
-    nixpkgs.overlays =
+    test.stubs.ne = { };
-      [ (self: super: { ne = pkgs.writeScriptBin "dummy-ne" ""; }) ];
 
     nmt = {
       description = "Check that configuration files are correctly written";

tests/modules/programs/neomutt/neomutt-no-folder-change.nix

@@ -17,8 +17,7 @@ with lib;
     programs.neomutt.enable = true;
     programs.neomutt.changeFolderWhenSourcingAccount = false;
 
-    nixpkgs.overlays =
+    test.stubs.neomutt = { };
-      [ (self: super: { neomutt = pkgs.writeScriptBin "dummy-neomutt" ""; }) ];
 
     nmt.script = ''
       assertFileExists home-files/.config/neomutt/hm@example.com

tests/modules/programs/neomutt/neomutt-not-primary.nix

@@ -13,8 +13,7 @@ with lib;
 
     programs.neomutt.enable = true;
 
-    nixpkgs.overlays =
+    test.stubs.neomutt = { };
-      [ (self: super: { neomutt = pkgs.writeScriptBin "dummy-neomutt" ""; }) ];
 
     nmt.script = ''
       assertFileExists home-files/.config/neomutt/neomuttrc

tests/modules/programs/neomutt/neomutt-with-binds-with-warning.nix

@@ -50,8 +50,7 @@ with lib;
       ];
     };
 
-    nixpkgs.overlays =
+    test.stubs.neomutt = { };
-      [ (self: super: { neomutt = pkgs.writeScriptBin "dummy-neomutt" ""; }) ];
 
     test.asserts.warnings.expected = [
       "Specifying 'programs.neomutt.(binds|macros).map' as a string is deprecated, use a list of strings instead. See https://github.com/nix-community/home-manager/pull/1885."

tests/modules/programs/neomutt/neomutt-with-binds.nix

@@ -50,8 +50,7 @@ with lib;
       ];
     };
 
-    nixpkgs.overlays =
+    test.stubs.neomutt = { };
-      [ (self: super: { neomutt = pkgs.writeScriptBin "dummy-neomutt" ""; }) ];
 
     nmt.script = ''
       assertFileExists home-files/.config/neomutt/neomuttrc

tests/modules/programs/neomutt/neomutt-with-gpg.nix

@@ -16,8 +16,7 @@ with lib; {
 
     programs.neomutt.enable = true;
 
-    nixpkgs.overlays =
+    test.stubs.neomutt = { };
-      [ (self: super: { neomutt = pkgs.writeScriptBin "dummy-neomutt" ""; }) ];
 
     nmt.script = ''
       assertFileExists home-files/.config/neomutt/neomuttrc

tests/modules/programs/neomutt/neomutt-with-msmtp.nix

@@ -21,8 +21,7 @@ with lib;
 
     programs.neomutt.enable = true;
 
-    nixpkgs.overlays =
+    test.stubs.neomutt = { };
-      [ (self: super: { neomutt = pkgs.writeScriptBin "dummy-neomutt" ""; }) ];
 
     nmt.script = ''
       assertFileExists home-files/.config/neomutt/neomuttrc

tests/modules/programs/neomutt/neomutt-with-named-mailboxes.nix

@@ -33,8 +33,7 @@ with lib;
       vimKeys = false;
     };
 
-    nixpkgs.overlays =
+    test.stubs.neomutt = { };
-      [ (self: super: { neomutt = pkgs.writeScriptBin "dummy-neomutt" ""; }) ];
 
     nmt.script = ''
       assertFileExists home-files/.config/neomutt/neomuttrc

tests/modules/programs/neomutt/neomutt.nix

@@ -24,8 +24,7 @@ with lib;
       vimKeys = false;
     };
 
-    nixpkgs.overlays =
+    test.stubs.neomutt = { };
-      [ (self: super: { neomutt = pkgs.writeScriptBin "dummy-neomutt" ""; }) ];
 
     nmt.script = ''
       assertFileExists home-files/.config/neomutt/neomuttrc

tests/modules/programs/newsboat/newsboat-basics-2003.nix

@@ -22,9 +22,7 @@ with lib;
       queries = { "foo" = ''rssurl =~ "example.com"''; };
     };
 
-    nixpkgs.overlays = [
+    test.stubs.newsboat = { };
-      (self: super: { newsboat = pkgs.writeScriptBin "dummy-newsboat" ""; })
-    ];
 
     nmt.script = ''
       assertFileContent \

tests/modules/programs/newsboat/newsboat-basics-2105.nix

@@ -22,9 +22,7 @@ with lib;
       queries = { "foo" = ''rssurl =~ "example.com"''; };
     };
 
-    nixpkgs.overlays = [
+    test.stubs.newsboat = { };
-      (self: super: { newsboat = pkgs.writeScriptBin "dummy-newsboat" ""; })
-    ];
 
     # The format didn't change since 20.03, just the location.
     nmt.script = ''

tests/modules/programs/newsboat/newsboat-basics.nix

@@ -20,9 +20,7 @@ with lib;
       queries = { "foo" = ''rssurl =~ "example.com"''; };
     };
 
-    nixpkgs.overlays = [
+    test.stubs.newsboat = { };
-      (self: super: { newsboat = pkgs.writeScriptBin "dummy-newsboat" ""; })
-    ];
 
     nmt.script = ''
       assertFileContent \

tests/modules/programs/nix-index/assert-on-command-not-found.nix

@@ -12,14 +12,10 @@
     xdg.dataFile."fish/home-manager_generated_completions".source =
       lib.mkForce (builtins.toFile "empty" "");
 
-    nixpkgs.overlays = [
+    test.stubs = {
-      (self: super:
+      zsh = { };
-        let dummy = pkgs.writeScriptBin "dummy" "";
+      fish = { };
-        in {
+    };
-          zsh = dummy;
-          fish = dummy;
-        })
-    ];
 
     programs.nix-index.enable = true;
 

tests/modules/programs/nix-index/integrations.nix

@@ -16,14 +16,10 @@ in {
     xdg.dataFile."fish/home-manager_generated_completions".source =
       lib.mkForce (builtins.toFile "empty" "");
 
-    nixpkgs.overlays = [
+    test.stubs = {
-      (self: super:
+      zsh = { };
-        let dummy = pkgs.writeScriptBin "dummy" "";
+      fish = { };
-        in {
+    };
-          zsh = dummy;
-          fish = dummy;
-        })
-    ];
 
     programs.nix-index.enable = true;
 

tests/modules/programs/nushell/settings.nix

@@ -22,8 +22,7 @@ with lib;
       ];
     };
 
-    nixpkgs.overlays =
+    test.stubs.nushell = { };
-      [ (self: super: { nushell = pkgs.writeScriptBin "dummy-nushell" ""; }) ];
 
     nmt.script = ''
       assertFileContent \

tests/modules/programs/powerline-go/bash.nix

@@ -18,8 +18,7 @@ with lib;
       };
     };
 
-    nixpkgs.overlays =
+    test.stubs.powerline-go = { };
-      [ (self: super: { powerline-go = pkgs.writeScriptBin "dummy-pkg" ""; }) ];
 
     nmt.script = ''
       assertFileExists home-files/.bashrc

tests/modules/programs/powerline-go/fish.nix

@@ -22,14 +22,10 @@ with lib;
     xdg.dataFile."fish/home-manager_generated_completions".source =
       mkForce (builtins.toFile "empty" "");
 
-    nixpkgs.overlays = [
+    test.stubs = {
-      (self: super:
+      powerline-go = { };
-        let dummy = pkgs.writeScriptBin "dummy" "";
+      fish = { };
-        in {
+    };
-          powerline-go = dummy;
-          fish = dummy;
-        })
-    ];
 
     nmt.script = ''
       assertFileExists home-files/.config/fish/config.fish

tests/modules/programs/powerline-go/zsh.nix

@@ -18,12 +18,10 @@ with lib;
       };
     };
 
-    nixpkgs.overlays = [
+    test.stubs = {
-      (self: super: {
+      powerline-go = { };
-        powerline-go = pkgs.writeScriptBin "dummy-pkg" "";
+      zsh = { };
-        zsh = pkgs.writeScriptBin "dummy-pkg" "";
+    };
-      })
-    ];
 
     nmt.script = ''
       assertFileExists home-files/.zshrc

tests/modules/programs/qutebrowser/keybindings.nix

@@ -18,11 +18,7 @@ with lib;
       };
     };
 
-    nixpkgs.overlays = [
+    test.stubs.qutebrowser = { };
-      (self: super: {
-        qutebrowser = pkgs.writeScriptBin "dummy-qutebrowser" "";
-      })
-    ];
 
     nmt.script = let
       qutebrowserConfig = if pkgs.stdenv.hostPlatform.isDarwin then

tests/modules/programs/qutebrowser/quickmarks.nix

@@ -13,11 +13,7 @@ with lib;
       };
     };
 
-    nixpkgs.overlays = [
+    test.stubs.qutebrowser = { };
-      (self: super: {
-        qutebrowser = pkgs.writeScriptBin "dummy-qutebrowser" "";
-      })
-    ];
 
     nmt.script = let
       quickmarksFile = if pkgs.stdenv.hostPlatform.isDarwin then

tests/modules/programs/qutebrowser/settings.nix

@@ -24,11 +24,7 @@ with lib;
       '';
     };
 
-    nixpkgs.overlays = [
+    test.stubs.qutebrowser = { };
-      (self: super: {
-        qutebrowser = pkgs.writeScriptBin "dummy-qutebrowser" "";
-      })
-    ];
 
     nmt.script = let
       qutebrowserConfig = if pkgs.stdenv.hostPlatform.isDarwin then

tests/modules/programs/rbw/empty-settings.nix

@@ -1,4 +1,5 @@
 { pkgs, ... }:
+
 let
   inherit (pkgs.stdenv.hostPlatform) isDarwin;
 
@@ -7,13 +8,11 @@ let
   else
     ".config/rbw/config.json";
 in {
-  config = {
+  imports = [ ./rbw-stubs.nix ];
-    programs.rbw.enable = true;
 
-    nixpkgs.overlays = [ (import ./overlay.nix) ];
+  programs.rbw.enable = true;
 
-    nmt.script = ''
+  nmt.script = ''
-      assertPathNotExists home-files/${path}
+    assertPathNotExists home-files/${path}
-    '';
+  '';
-  };
 }

tests/modules/programs/rbw/overlay.nix

@@ -1,12 +0,0 @@
-self: super: {
-  rbw = self.writeScriptBin "dummy-rbw" "";
-  pinentry = {
-    gnome3 = self.writeScriptBin "pinentry-gnome3" "" // {
-      outPath = "@pinentry-gnome3@";
-    };
-    gtk2 = self.writeScriptBin "pinentry-gtk2" "" // {
-      outPath = "@pinentry-gtk2@";
-    };
-    flavors = [ "gnome3" "gtk2" ];
-  };
-}

tests/modules/programs/rbw/rbw-stubs.nix

@@ -0,0 +1,16 @@
+{ config, ... }:
+
+{
+  test.stubs.rbw = { };
+
+  nixpkgs.overlays = [
+    (self: super: {
+      pinentry = {
+        gnome3 =
+          config.lib.test.mkStubPackage { outPath = "@pinentry-gnome3@"; };
+        gtk2 = config.lib.test.mkStubPackage { outPath = "@pinentry-gtk2@"; };
+        flavors = [ "gnome3" "gtk2" ];
+      };
+    })
+  ];
+}

tests/modules/programs/rbw/settings.nix

@@ -1,4 +1,5 @@
 { pkgs, ... }:
+
 let
   inherit (pkgs.stdenv.hostPlatform) isDarwin;
 
@@ -17,23 +18,21 @@ let
     }
   '';
 in {
-  config = {
+  imports = [ ./rbw-stubs.nix ];
-    programs.rbw = {
+
-      enable = true;
+  programs.rbw = {
-      settings = {
+    enable = true;
-        email = "name@example.com";
+    settings = {
-        base_url = "bitwarden.example.com";
+      email = "name@example.com";
-        identity_url = "identity.example.com";
+      base_url = "bitwarden.example.com";
-        lock_timeout = 300;
+      identity_url = "identity.example.com";
-        pinentry = "gnome3";
+      lock_timeout = 300;
-      };
+      pinentry = "gnome3";
     };
-
-    nixpkgs.overlays = [ (import ./overlay.nix) ];
-
-    nmt.script = ''
-      assertFileExists home-files/${path}
-      assertFileContent home-files/${path} '${expected}'
-    '';
   };
+
+  nmt.script = ''
+    assertFileExists home-files/${path}
+    assertFileContent home-files/${path} '${expected}'
+  '';
 }

tests/modules/programs/rbw/simple-settings.nix

@@ -1,4 +1,5 @@
 { pkgs, ... }:
+
 let
   inherit (pkgs.stdenv.hostPlatform) isDarwin;
 
@@ -17,17 +18,15 @@ let
     }
   '';
 in {
-  config = {
+  imports = [ ./rbw-stubs.nix ];
-    programs.rbw = {
-      enable = true;
-      settings = { email = "name@example.com"; };
-    };
 
-    nixpkgs.overlays = [ (import ./overlay.nix) ];
+  programs.rbw = {
-
+    enable = true;
-    nmt.script = ''
+    settings = { email = "name@example.com"; };
-      assertFileExists home-files/${path}
-      assertFileContent home-files/${path} '${expected}'
-    '';
   };
+
+  nmt.script = ''
+    assertFileExists home-files/${path}
+    assertFileContent home-files/${path} '${expected}'
+  '';
 }

tests/modules/programs/rofi-pass/rofi-pass-config.nix

@@ -16,14 +16,10 @@ with lib;
       };
     };
 
-    nixpkgs.overlays = [
+    test.stubs = {
-      (self: super:
+      rofi = { };
-        let dummy = pkgs.writeScriptBin "dummy" "";
+      rofi-pass = { };
-        in {
+    };
-          rofi = dummy;
-          rofi-pass = dummy;
-        })
-    ];
 
     nmt.script = ''
       assertFileContent \

tests/modules/programs/rofi-pass/rofi-pass-root.nix

@@ -13,14 +13,10 @@ with lib;
       };
     };
 
-    nixpkgs.overlays = [
+    test.stubs = {
-      (self: super:
+      rofi = { };
-        let dummy = pkgs.writeScriptBin "dummy" "";
+      rofi-pass = { };
-        in {
+    };
-          rofi = dummy;
-          rofi-pass = dummy;
-        })
-    ];
 
     nmt.script = ''
       assertFileContent \

tests/modules/programs/rofi/assert-on-both-theme-and-colors.nix

@@ -17,8 +17,7 @@ with lib;
       };
     };
 
-    nixpkgs.overlays =
+    test.stubs.rofi = { };
-      [ (self: super: { rofi = pkgs.writeScriptBin "dummy-rofi" ""; }) ];
 
     test.asserts.assertions.expected = [''
       Cannot use the rofi options 'theme' and 'colors' simultaneously.

tests/modules/programs/rofi/custom-theme.nix

@@ -29,8 +29,7 @@ with lib;
       };
     };
 
-    nixpkgs.overlays =
+    test.stubs.rofi = { };
-      [ (self: super: { rofi = pkgs.writeScriptBin "dummy-rofi" ""; }) ];
 
     nmt.script = ''
       assertFileContent \

tests/modules/programs/rofi/valid-config.nix

@@ -48,8 +48,7 @@ with lib;
       };
     };
 
-    nixpkgs.overlays =
+    test.stubs.rofi = { };
-      [ (self: super: { rofi = pkgs.writeScriptBin "dummy-rofi" ""; }) ];
 
     nmt.script = ''
       assertFileContent \

tests/modules/programs/scmpuff/no-shell.nix

@@ -10,8 +10,7 @@
       zsh.enable = true;
     };
 
-    nixpkgs.overlays =
+    test.stubs.zsh = { };
-      [ (self: super: { zsh = pkgs.writeScriptBin "dummy" ""; }) ];
 
     nmt.script = ''
       assertFileNotRegex home-files/.zshrc '${pkgs.scmpuff} init -s'

tests/modules/programs/scmpuff/no-zsh.nix

@@ -8,8 +8,7 @@
       zsh.enable = true;
     };
 
-    nixpkgs.overlays =
+    test.stubs.zsh = { };
-      [ (self: super: { zsh = pkgs.writeScriptBin "dummy" ""; }) ];
 
     nmt.script = ''
       assertFileNotRegex home-files/.zshrc '${pkgs.scmpuff} init -s'

tests/modules/programs/scmpuff/zsh.nix

@@ -5,8 +5,7 @@
       zsh.enable = true;
     };
 
-    nixpkgs.overlays =
+    test.stubs.zsh = { };
-      [ (self: super: { zsh = pkgs.writeScriptBin "dummy" ""; }) ];
 
     nmt.script = ''
       assertFileExists home-files/.zshrc

tests/modules/programs/sm64ex/settings.nix

@@ -39,8 +39,7 @@ with lib;
       };
     };
 
-    nixpkgs.overlays =
+    test.stubs.sm64ex = { };
-      [ (self: super: { sm64ex = pkgs.writeScriptBin "dummy-sm64ex" ""; }) ];
 
     nmt.script = ''
       assertFileContent \

tests/modules/programs/starship/settings.nix

@@ -44,9 +44,7 @@ with lib;
       ];
     };
 
-    nixpkgs.overlays = [
+    test.stubs.starship = { };
-      (self: super: { starship = pkgs.writeScriptBin "dummy-starship" ""; })
-    ];
 
     nmt.script = ''
       assertFileContent \

tests/modules/programs/terminator/config-file.nix

@@ -8,8 +8,7 @@
       };
     };
 
-    nixpkgs.overlays =
+    test.stubs.terminator = { };
-      [ (self: super: { terminator = pkgs.writeScriptBin "dummy" ""; }) ];
 
     nmt.script = ''
       assertFileContent home-files/.config/terminator/config ${

tests/modules/programs/topgrade/settings.nix

@@ -25,9 +25,7 @@ with lib;
       ];
     };
 
-    nixpkgs.overlays = [
+    test.stubs.topgrade = { };
-      (self: super: { topgrade = pkgs.writeScriptBin "dummy-topgrade" ""; })
-    ];
 
     nmt.script = ''
       assertFileContent \

tests/modules/programs/waybar/settings-complex.nix

@@ -2,12 +2,10 @@
 
 with lib;
 
-let
+{
-  package = pkgs.writeScriptBin "dummy-waybar" "" // { outPath = "@waybar@"; };
-in {
   config = {
     programs.waybar = {
-      inherit package;
+      package = config.lib.test.mkStubPackage { outPath = "@waybar@"; };
       enable = true;
       settings = [{
         layer = "top";
@@ -41,9 +39,7 @@ in {
             format = "hello from {}";
             exec = let
               dummyScript =
-                pkgs.writeShellScriptBin "dummy" "echo within waybar" // {
+                config.lib.test.mkStubPackage { outPath = "@dummy@"; };
-                  outPath = "@dummy@";
-                };
             in "${dummyScript}/bin/dummy";
           };
         };

tests/modules/programs/waybar/styling.nix

@@ -2,12 +2,10 @@
 
 with lib;
 
-let
+{
-  package = pkgs.writeScriptBin "dummy-waybar" "" // { outPath = "@waybar@"; };
-in {
   config = {
     programs.waybar = {
-      inherit package;
+      package = config.lib.test.mkStubPackage { outPath = "@waybar@"; };
       enable = true;
       style = ''
         * {

tests/modules/programs/waybar/systemd-with-graphical-session-target.nix

@@ -2,12 +2,10 @@
 
 with lib;
 
-let
+{
-  package = pkgs.writeScriptBin "dummy-waybar" "" // { outPath = "@waybar@"; };
-in {
   config = {
     programs.waybar = {
-      inherit package;
+      package = config.lib.test.mkStubPackage { outPath = "@waybar@"; };
       enable = true;
       systemd.enable = true;
     };

tests/modules/programs/waybar/warnings-tests.nix

@@ -2,12 +2,10 @@
 
 with lib;
 
-let
+{
-  package = pkgs.writeScriptBin "dummy-waybar" "" // { outPath = "@waybar@"; };
-in {
   config = {
     programs.waybar = {
-      inherit package;
+      package = config.lib.test.mkStubPackage { outPath = "@waybar@"; };
       enable = true;
       settings = [{
         modules-left = [ "custom/my-module" ];

tests/modules/programs/xmobar/basic-configuration.nix

@@ -6,7 +6,7 @@ with lib;
   config = {
     programs.xmobar = {
       enable = true;
-      package = pkgs.writeScriptBin "dummy" "";
+      package = config.lib.test.mkStubPackage { };
       extraConfig = ''
         Config
           { font        = "Fira Code"

tests/modules/programs/zplug/modules.nix

@@ -21,16 +21,14 @@ with lib;
       };
     };
 
-    nixpkgs.overlays = [
+    test.stubs = {
-      (self: super: {
+      zplug = { };
-        zsh = pkgs.writeScriptBin "dummy-zsh" "";
+      zsh = { };
-        zplug = pkgs.writeScriptBin "dummy-zplug" "";
+    };
-      })
-    ];
 
     nmt.script = ''
-      assertFileRegex home-files/.zshrc \
+      assertFileContains home-files/.zshrc \
-        '^source ${builtins.storeDir}/.*zplug.*/init\.zsh$'
+        'source @zplug@/init.zsh'
 
       assertFileContains home-files/.zshrc \
         'zplug "plugins/git", from:oh-my-zsh'