pythonPackages.django_silk: enable tests

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

@@ -1,6 +1,7 @@
 { stdenv
 , buildPythonPackage
-, fetchPypi
+, python
+, fetchFromGitHub
 , django
 , pygments
 , simplejson
@@ -13,18 +14,31 @@
 , pillow
 , mock
 , gprof2dot
+, freezegun
+, contextlib2
+, networkx
+, pydot
+, factory_boy
 }:
 
 buildPythonPackage rec {
   pname = "django-silk";
   version = "3.0.2";
 
-  src = fetchPypi {
-    inherit pname version;
-    sha256 = "8dd5b78531360bd8c3d571384f9f4f82ef03e1764e30dd4621c5638f5c973a1d";
+  # pypi tarball doesn't include test project
+  src = fetchFromGitHub {
+    owner = "jazzband";
+    repo = "django-silk";
+    rev = version;
+    sha256 = "1fbaafc2gx01gscdalp6hj6bz4b0cmq59lgmvsydw7jkds4mps7c";
   };
-
-  doCheck = false;
+  # "test_time_taken" tests aren't suitable for reproducible execution, but django's
+  # test runner doesn't have an easy way to ignore tests - so instead prevent it from picking
+  # them up as tests
+  postPatch = ''
+    substituteInPlace project/tests/test_silky_profiler.py \
+      --replace "def test_time_taken" "def _test_time_taken"
+  '';
 
   buildInputs = [ mock ];
   propagatedBuildInputs = [
@@ -32,6 +46,11 @@ buildPythonPackage rec {
     sqlparse jinja2 autopep8 pytz pillow gprof2dot
   ];
 
+  checkInputs = [ freezegun contextlib2 networkx pydot factory_boy ];
+  checkPhase = ''
+    cd project
+    DB=sqlite3 DB_NAME=db.sqlite3 ${python.interpreter} manage.py test
+  '';
 
   meta = with stdenv.lib; {
     description = "Silky smooth profiling for the Django Framework";