python3Packages.cytoolz: fix tests

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

@@ -2,7 +2,7 @@
 , buildPythonPackage
 , fetchPypi
 , isPyPy
-, nose
+, pytestCheckHook
 , toolz
 , python
 , isPy27
@@ -18,13 +18,17 @@ buildPythonPackage rec {
     sha256 = "ea23663153806edddce7e4153d1d407d62357c05120a4e8485bddf1bd5ab22b4";
   };
 
-  checkInputs = [ nose ];
   propagatedBuildInputs = [ toolz ];
 
-  checkPhase = ''
-    nosetests -v $out/${python.sitePackages}
+  # tests are located in cytoolz/tests, however we can't import cytoolz
+  # from $PWD, as it will break relative imports
+  preCheck = ''
+    cd cytoolz
+    export PYTHONPATH=$out/${python.sitePackages}:$PYTHONPATH
   '';
 
+  checkInputs = [ pytestCheckHook ];
+
   meta = {
     homepage = "https://github.com/pytoolz/cytoolz/";
     description = "Cython implementation of Toolz: High performance functional utilities";