home-manager/tests/modules/services/i3/i3-null-config.nix

{
  imports = [ ./i3-stubs.nix ];

  xsession.windowManager.i3 = {
    enable = true;
    config = null;
  };

  nmt.script = ''
    assertFileExists home-files/.config/i3/config
    assertFileContent home-files/.config/i3/config \
      ${builtins.toFile "expected" ""}
  '';
}