Fix and test Resources arginfo (#328)

xref: #325

---------

Signed-off-by: Jinzhe Zeng <jinzhe.zeng@rutgers.edu>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

dpdispatcher/slurm.py

@@ -364,7 +364,7 @@ def resources_subfields(cls) -> List[Argument]:
         """
         doc_slurm_job_size = "Number of tasks in a Slurm job"
         arg = super().resources_subfields()[0]
-        arg["kwargs"].extend_subfields(
+        arg.extend_subfields(
             [
                 Argument(
                     "slurm_job_size",

tests/test_class_resources.py

@@ -42,6 +42,9 @@ def test_resources_json(self):
         self.assertTrue(resources_json_dict, self.resources_dict)
         self.assertTrue(resources_json_dict, self.resources.serialize())
 
+    def test_arginfo(self):
+        self.resources.arginfo()
+
     def test_load_from_json(self):
         resources = Resources.load_from_json("jsons/resources.json")
         self.assertTrue(resources, self.resources)