pythonPackages.lektor: use pytestCheckHook

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

@@ -12,8 +12,8 @@
 , flask
 , pyopenssl
 , ndg-httpsclient
-, pytest
-, pytestcov
+, pytestCheckHook
+, pytest-cov
 , pytest-mock
 , pytest-pylint
 , pytest-click
@@ -39,13 +39,9 @@ buildPythonPackage rec {
   ] ++ lib.optionals isPy27 [ functools32 ];
 
   checkInputs = [
-    pytest pytestcov pytest-mock pytest-pylint pytest-click
+    pytestCheckHook pytest-cov pytest-mock pytest-pylint pytest-click
   ];
 
-  checkPhase = ''
-    pytest
-  '';
-
   # many errors -- tests assume inside of git repo, linting errors 13/317 fail
   doCheck = false;