{ lib, crate2nix }:
let
  featureMap = {
    default = [ "tls" ];
    resolvable = [ "feature1" "tls/extra_feature" ];
    feature1 = [ ];
    extra = [ ];
  };
  dependencies = [
    {
      name = "tls";
      packageId = "pkgid_tls";
    }
    {
      name = "extra";
      packageId = "pkgid_extra";
    }
    {
      name = "with_target";
      target_cfg = true;
      optional = false;
      with_defaults = false;
      packageId = "pkgid_target";
    }
  ];
in
{
  testEmpty = {
    expr = crate2nix.expandFeatures featureMap [ ];
    expected = [ ];
  };
  testDefault = {
    expr = crate2nix.expandFeatures featureMap [ "default" ];
    expected = [ "default" "tls" ];
  };
  testDefaultPlus = {
    expr = crate2nix.expandFeatures featureMap [ "default" "resolvable" ];
    expected = [ "default" "feature1" "resolvable" "tls" "tls/extra_feature" ];
  };
}