add test for dateutil alias infinite recursion

tests/all-tests.nix

@@ -2,6 +2,7 @@ let
   mach-nix = import ../. {};
 in
 map (file: import file { inherit mach-nix; }) [
+  ./test_alias_dateutil.nix
   ./test_circular_deps.nix
   ./test_dot_in_name.nix
   ./test_extra_pkgs.nix

tests/test_alias_dateutil.nix

@@ -0,0 +1,12 @@
+# packages with aliases were causing infinite recursions
+{
+  mach-nix ? import ../. {},
+  ...
+}:
+with builtins;
+mach-nix.mkPython {
+  requirements = ''
+    python-dateutil
+  '';
+  providers.python-dateutil = "sdist";
+}