pythonPackages.testtools: clean up dependencies

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

@@ -4,33 +4,26 @@
 , pbr
 , python_mimeparse
 , extras
-, lxml
 , unittest2
 , traceback2
-, isPy3k
-, fixtures
-, pyrsistent
+, testscenarios
 }:
 
-
-
 buildPythonPackage rec {
   pname = "testtools";
   version = "2.3.0";
 
-  # Python 2 only judging from SyntaxError
-#   disabled = isPy3k;
-
   src = fetchPypi {
     inherit pname version;
     sha256 = "5827ec6cf8233e0f29f51025addd713ca010061204fdea77484a2934690a0559";
   };
 
-  propagatedBuildInputs = [ pbr python_mimeparse extras lxml unittest2 pyrsistent ];
+  propagatedBuildInputs = [ pbr python_mimeparse extras unittest2 ];
   buildInputs = [ traceback2 ];
 
-  # No tests in archive
+  # testscenarios has a circular dependency on testtools
   doCheck = false;
+  checkInputs = [ testscenarios ];
 
   # testtools 2.0.0 and up has a circular run-time dependency on futures
   postPatch = ''
@@ -42,4 +35,4 @@ buildPythonPackage rec {
     homepage = https://pypi.python.org/pypi/testtools;
     license = lib.licenses.mit;
   };
-}
+}