python3Packages.python-daemon: fix build & refactor

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

@@ -1,9 +1,12 @@
-{ lib, buildPythonPackage, fetchPypi
+{ lib
+, buildPythonPackage
+, fetchPypi
 , docutils
 , lockfile
 , mock
 , pytest_4
 , testscenarios
+, testtools
 , twine
 }:
 
@@ -16,13 +19,31 @@ buildPythonPackage rec {
     sha256 = "bda993f1623b1197699716d68d983bb580043cf2b8a66a01274d9b8297b0aeaf";
   };
 
-  nativeBuildInputs = [ twine ];
-  propagatedBuildInputs = [ docutils lockfile ];
+  nativeBuildInputs = [
+    twine
+  ];
 
-  checkInputs = [ pytest_4 mock testscenarios ];
+  propagatedBuildInputs = [
+    docutils
+    lockfile
+  ];
+
+  checkInputs = [
+    pytest_4
+    mock
+    testscenarios
+    testtools
+  ];
+
+  # tests disabled due to incompatibilities with testtools>=2.5.0
   checkPhase = ''
-    pytest -k 'not detaches_process_context \
-                and not standard_stream_file_descriptors'
+    runHook preCheck
+    pytest -k ' \
+      not detaches_process_context and \
+      not standard_stream_file_descriptors and \
+      not test_module_has_attribute and \
+      not test_module_attribute_has_duck_type'
+    runHook postCheck
   '';
 
   pythonImportsCheck = [
@@ -35,6 +56,10 @@ buildPythonPackage rec {
   meta = with lib; {
     description = "Library to implement a well-behaved Unix daemon process";
     homepage = "https://pagure.io/python-daemon/";
-    license = [ licenses.gpl3Plus licenses.asl20 ];
+    license = with licenses; [
+      gpl3Plus
+      asl20
+    ];
+    maintainers = with maintainers; [ ];
   };
 }