python.pkgs.pytest-mock: use 2.0.0 for python 2

pkgs/development/python-modules/pytest-mock/2.nix

@@ -0,0 +1,40 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, fetchpatch
+, isPy3k
+, pytest
+, mock
+, setuptools_scm
+}:
+
+buildPythonPackage rec {
+  pname = "pytest-mock";
+  version = "2.0.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "b35eb281e93aafed138db25c8772b95d3756108b601947f89af503f8c629413f";
+  };
+
+  propagatedBuildInputs = lib.optional (!isPy3k) mock;
+
+  nativeBuildInputs = [
+   setuptools_scm
+  ];
+
+  checkInputs = [
+    pytest
+  ];
+
+  checkPhase = ''
+    pytest
+  '';
+
+  meta = with lib; {
+    description = "Thin-wrapper around the mock package for easier use with py.test.";
+    homepage    = "https://github.com/pytest-dev/pytest-mock";
+    license     = licenses.mit;
+    maintainers = with maintainers; [ nand0p ];
+  };
+}

pkgs/top-level/python-packages.nix

@@ -2527,7 +2527,10 @@ in {
 
   pytest-mpl = callPackage ../development/python-modules/pytest-mpl { };
 
-  pytest-mock = callPackage ../development/python-modules/pytest-mock { };
+  pytest-mock = if isPy3k then
+    callPackage ../development/python-modules/pytest-mock { }
+  else
+    callPackage ../development/python-modules/pytest-mock/2.nix { };
 
   pytest-openfiles = callPackage ../development/python-modules/pytest-openfiles { };