stack overflow (possible infinite recursion)

[xieby1]

Minimal test case test.nix:

let
  pkgs = import <nixpkgs> {};
in {
  test-hello = {
    expr = pkgs.hello;
    expected = pkgs.hello;
  };
}

nix-unit test.nix throws error:

...
evaluation warning: Use `stdenv.tests` instead. `passthru` is a `mkDerivation` detail.
evaluation warning: Use `stdenv.tests` instead. `passthru` is a `mkDerivation` detail.
evaluation warning: Use `stdenv.tests` instead. `passthru` is a `mkDerivation` detail.
error: stack overflow (possible infinite recursion)