nixpkgs/nixos/tests/env.nix

import ./make-test.nix ({ pkgs, ...} : {
  name = "environment";
  meta = with pkgs.stdenv.lib.maintainers; {
    maintainers = [ nequissimus ];
  };

  machine = { pkgs, ... }:
    {
      boot.kernelPackages = pkgs.linuxPackages;
      environment.etc."plainFile".text = ''
        Hello World
      '';
      environment.etc."folder/with/file".text = ''
        Foo Bar!
      '';

      environment.sessionVariables = {
        TERMINFO_DIRS = "/run/current-system/sw/share/terminfo";
        NIXCON = "awesome";
      };
    };

  testScript =
    ''
      $machine->succeed('[ -L "/etc/plainFile" ]');
      $machine->succeed('cat "/etc/plainFile" | grep "Hello World"');
      $machine->succeed('[ -d "/etc/folder" ]');
      $machine->succeed('[ -d "/etc/folder/with" ]');
      $machine->succeed('[ -L "/etc/folder/with/file" ]');
      $machine->succeed('cat "/etc/plainFile" | grep "Hello World"');

      $machine->succeed('echo ''${TERMINFO_DIRS} | grep "/run/current-system/sw/share/terminfo"');
      $machine->succeed('echo ''${NIXCON} | grep "awesome"');
    '';
})