pythonPackages.python-subtesthack: Move to own file

pkgs/development/python-modules/pytest-subtesthack/default.nix

···
+{ stdenv, buildPythonPackage, fetchPypi, pytest }:
+
+buildPythonPackage rec {
+  pname = "pytest-subtesthack";
+  version = "0.1.1";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "15kzcr5pchf3id4ikdvlv752rc0j4d912n589l4rifp8qsj19l1x";
+  };
+
+  buildInputs = [ pytest ];
+
+  # no upstream test
+  doCheck = false;
+
+  meta = with stdenv.lib; {
+    description = "Terrible plugin to set up and tear down fixtures within the test function itself";
+    homepage = https://github.com/untitaker/pytest-subtesthack;
+    license = licenses.publicDomain;
+  };
+}

pkgs/top-level/python-packages.nix

···
 
   pytest-localserver = callPackage ../development/python-modules/pytest-localserver { };
 
-  pytest-subtesthack = buildPythonPackage rec {
-    name = "pytest-subtesthack-${version}";
-    version = "0.1.1";
-
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/p/pytest-subtesthack/${name}.tar.gz";
-      sha256 = "15kzcr5pchf3id4ikdvlv752rc0j4d912n589l4rifp8qsj19l1x";
-    };
-
-    buildInputs = with self; [ pytest ];
-
-    # no upstream test
-    doCheck = false;
-
-    meta = {
-      description = "Terrible plugin to set up and tear down fixtures within the test function itself";
-      homepage = https://github.com/untitaker/pytest-subtesthack;
-      license = licenses.publicDomain;
-    };
-  };
+  pytest-subtesthack = callPackage ../development/python-modules/pytest-subtesthack { };
 
   pytest-sugar = callPackage ../development/python-modules/pytest-sugar { };