python3Packages.sgmllib3k: disable failing test on Python 3.10

pkgs/development/python-modules/sgmllib3k/default.nix

@@ -2,14 +2,17 @@
 , buildPythonPackage
 , fetchFromGitHub
 , isPy27
+, pytestCheckHook
+, pythonAtLeast
 }:
 
 buildPythonPackage rec {
   pname = "sgmllib3k";
   version = "1.0.0";
+  format = "setuptools";
+
   disabled = isPy27;
 
-  # fetchFromGitHub instead of fetchPypi to run tests.
   src = fetchFromGitHub {
     owner = "hsoft";
     repo = "sgmllib";
@@ -17,6 +20,18 @@ buildPythonPackage rec {
     sha256 = "0bzf6pv85dzfxfysm6zbj8m40hp0xzr9h8qlk4hp3nmy88rznqvr";
   };
 
+  checkInputs = [
+    pytestCheckHook
+  ];
+
+  disabledTests = lib.optionals (pythonAtLeast "3.10") [
+    "test_declaration_junk_chars"
+  ];
+
+  pythonImportsCheck = [
+    "sgmllib"
+  ];
+
   meta = with lib; {
     homepage = "https://pypi.org/project/sgmllib3k/";
     description = "Python 3 port of sgmllib";