{ self, ... }: {
  imports = [
    ./impure/flake-module.nix
    ./backups/flake-module.nix
  ];
  perSystem = { pkgs, lib, self', ... }: {
    checks =
      let
        nixosTestArgs = {
          # reference to nixpkgs for the current system
          inherit pkgs;
          # this gives us a reference to our flake but also all flake inputs
          inherit self;
        };
        nixosTests = lib.optionalAttrs (pkgs.stdenv.isLinux) {
          # import our test
          secrets = import ./secrets nixosTestArgs;
          container = import ./container nixosTestArgs;
          deltachat = import ./deltachat nixosTestArgs;
          meshnamed = import ./meshnamed nixosTestArgs;
          borgbackup = import ./borgbackup nixosTestArgs;
          syncthing = import ./syncthing nixosTestArgs;
          wayland-proxy-virtwl = import ./wayland-proxy-virtwl nixosTestArgs;
        };
        schemaTests = pkgs.callPackages ./schemas.nix {
          inherit self;
        };

        flakeOutputs = lib.mapAttrs' (name: config: lib.nameValuePair "nixos-${name}" config.config.system.build.toplevel) self.nixosConfigurations
          // lib.mapAttrs' (n: lib.nameValuePair "package-${n}") self'.packages
          // lib.mapAttrs' (n: lib.nameValuePair "devShell-${n}") self'.devShells
          // lib.mapAttrs' (name: config: lib.nameValuePair "home-manager-${name}" config.activation-script) (self'.legacyPackages.homeConfigurations or { });
      in
      nixosTests // schemaTests // flakeOutputs;
    legacyPackages = {
      nixosTests =
        let
          nixosTestArgs = {
            # reference to nixpkgs for the current system
            inherit pkgs;
            # this gives us a reference to our flake but also all flake inputs
            inherit self;
          };
        in
        lib.optionalAttrs (pkgs.stdenv.isLinux) {
          # import our test
          secrets = import ./secrets nixosTestArgs;
          container = import ./container nixosTestArgs;
        };
    };
  };
}