{
  lib ? pkgs.lib,
  pkgs ? import <nixpkgs> {},
  dream2nix ? import ./src { inherit pkgs; },
}:

let
  lib = pkgs.lib // builtins;

  makeTest =
    {
      name,
      source,
      cmds,
    }:
    let
      outputs = dream2nix.riseAndShine {
        inherit source;
      };
      commandsToRun = cmds outputs;
    in
      pkgs.runCommand "test-${name}" {}
        (lib.concatStringsSep "\n" commandsToRun);

  projects = {
    prettier = {
      source = lib.fetchTarball {
        url = "https://github.com/prettier/prettier/tarball/2.4.1";
        sha256 = "19b37qakhlsnr2n5bgv83aih5npgzbad1d2p2rs3zbq5syqbxdyi";
      };
      cmds = outputs: [
        "${outputs.defaultPackage}/bin/prettier --version | grep -q 2.4.1 && mkdir $out"
      ];
    };
  };

  allTests =
    lib.mapAttrs
      (name: args: makeTest (args // { inherit name; }))
      projects;
  
in
allTests