{
  description = "Testing mastodon configurations";

  inputs = {
    nixpkgs.url = "github:radvendii/nixpkgs/nixos_rebuild_tests";
  };

  outputs = { self, nixpkgs }: 
  let
    system = "x86_64-linux";
    pkgs = nixpkgs.legacyPackages.${system};
  in {

    nixosModules = {
      ## Fediversity modules
      garage = import ./fediversity/garage.nix;
      mastodon = import ./fediversity/mastodon.nix;
      peertube = import ./fediversity/peertube.nix;
      pixelfed = import ./fediversity/pixelfed.nix;

      ## VM-specific modules
      interactive-vm = import ./vm/interactive-vm.nix;
      mastodon-vm = import ./vm/mastodon-vm.nix;
      peertube-vm = import ./vm/peertube-vm.nix;
      pixelfed-vm = import ./vm/pixelfed-vm.nix;
    };

    nixosConfigurations = {
      mastodon = nixpkgs.lib.nixosSystem {
        inherit system;
        modules = with self.nixosModules; [ interactive-vm mastodon mastodon-vm garage ];
      };

      peertube = nixpkgs.lib.nixosSystem {
        inherit system;
        modules = with self.nixosModules; [ interactive-vm peertube peertube-vm garage ];
      };

      pixelfed = nixpkgs.lib.nixosSystem {
        inherit system;
        modules = with self.nixosModules; [ interactive-vm pixelfed pixelfed-vm garage ];
      };

      all = nixpkgs.lib.nixosSystem {
        inherit system;
        modules = with self.nixosModules; [
          interactive-vm
          peertube peertube-vm
          pixelfed pixelfed-vm
          mastodon mastodon-vm
          garage
        ];
      };
    };

    checks.${system} = {
      mastodon-garage = import ./tests/mastodon-garage.nix { inherit pkgs self; };
      pixelfed-garage = import ./tests/pixelfed-garage.nix { inherit pkgs self; };
    };

    devShells.${system}.default = pkgs.mkShell {
      inputs = with pkgs; [
        nil
      ];
    };
  };
}