testsuite: add Python job_list* constraint tests

Problem: None of the Python tests ensure the job_list and
job_list_inactive optional constraint parameters work.

Add a couple simple tests to t0013-job-list.py that ensure the
constraint parameters to these functions do something.

Author: grondo

t/python/t0013-job-list.py

@@ -320,6 +320,18 @@ def test_18_list_id_fail(self):
         with self.assertRaises(FileNotFoundError):
             rpc_handle.get_jobinfo()
 
+    def test_19_list_inactive_constraints(self):
+        for job in flux.job.job_list_inactive(
+            self.fh, constraint={"name": ["sleep"]}
+        ).get_jobinfos():
+            self.assertEqual(job.name, "sleep")
+
+    def test_20_list_constraints(self):
+        for job in flux.job.job_list(
+            self.fh, constraint={"name": ["sleep"]}
+        ).get_jobinfos():
+            self.assertEqual(job.name, "sleep")
+
 
 if __name__ == "__main__":
     from subflux import rerun_under_flux