python3Packages.mezzanine: fix src, enable tests, refactor

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

@@ -6,18 +6,20 @@
   chardet,
   django,
   django-contrib-comments,
-  fetchPypi,
+  fetchFromGitHub,
   filebrowser-safe,
-  future,
   grappelli-safe,
   isPyPy,
-  pep8,
   pillow,
-  pyflakes,
+  pytestCheckHook,
+  pytest-cov-stub,
+  pytest-django,
   pythonOlder,
   pytz,
   requests,
   requests-oauthlib,
+  requirements-parser,
+  setuptools,
   tzlocal,
 }:
 
@@ -28,25 +30,27 @@ buildPythonPackage rec {
 
   disabled = pythonOlder "3.7" || isPyPy;
 
-  src = fetchPypi {
-    pname = "Mezzanine";
-    inherit version;
-    hash = "sha256-RZ/9ltvZUz1eXxeaVqS9ZE69+a9XWt6fxMcss+yTVP4=";
+  src = fetchFromGitHub {
+    owner = "stephenmcd";
+    repo = "mezzanine";
+    tag = "v${version}";
+    hash = "sha256-TdGWlquS4hsnxIM0bhbWR7C0X4wyUcqC+YrBDSShRhg=";
   };
 
-  buildInputs = [
-    pyflakes
-    pep8
+  patches = [
+    # drop git requirement from tests and fake stable branch
+    ./tests-no-git.patch
   ];
 
-  propagatedBuildInputs = [
+  build-system = [ setuptools ];
+
+  dependencies = [
     beautifulsoup4
     bleach
     chardet
     django
     django-contrib-comments
     filebrowser-safe
-    future
     grappelli-safe
     pillow
     pytz
@@ -56,15 +60,12 @@ buildPythonPackage rec {
   ]
   ++ bleach.optional-dependencies.css;
 
-  # Tests Fail Due to Syntax Warning, Fixed for v3.1.11+
-  doCheck = false;
-
-  # sed calls will be unnecessary in v3.1.11+
-  preConfigure = ''
-    sed -i 's/==/>=/' setup.py
-  '';
-
-  LC_ALL = "en_US.UTF-8";
+  nativeCheckInputs = [
+    pytest-django
+    pytest-cov-stub
+    pytestCheckHook
+    requirements-parser
+  ];
 
   meta = with lib; {
     description = "Content management platform built using the Django framework";

pkgs/development/python-modules/mezzanine/tests-no-git.patch

@@ -0,0 +1,17 @@
+diff --git a/tests/test_core.py b/tests/test_core.py
+index 40cd39fe..57abbec0 100644
+--- a/tests/test_core.py
++++ b/tests/test_core.py
+@@ -47,11 +47,7 @@ from mezzanine.utils.sites import current_site_id, override_current_site_id
+ from mezzanine.utils.tests import TestCase
+ from mezzanine.utils.urls import admin_url
+ 
+-BRANCH_NAME = (
+-    subprocess.check_output(["git", "rev-parse", "--abbrev-ref", "HEAD"])
+-    .decode()
+-    .strip()
+-)
++BRANCH_NAME = "stable"
+ VERSION_WARN = (
+     "Unpinned or pre-release dependencies detected in Mezzanine's requirements: {}"
+ )