pythonPackages.keyrings-alt: disable tests

They heavily rely on the keyring package test suite

pkgs/development/python-modules/keyrings-alt/default.nix

@@ -21,10 +21,16 @@ buildPythonPackage rec {
 
   checkInputs = [ pytest keyring ] ++ stdenv.lib.optional (pythonOlder "3.3") backports_unittest-mock;
 
+  # heavily relies on importing tests from keyring package
+  doCheck = false;
   checkPhase = ''
     py.test
   '';
 
+  pythonImportsCheck = [
+    "keyrings.alt"
+  ];
+
   meta = with stdenv.lib; {
     license = licenses.mit;
     description = "Alternate keyring implementations";