ashb commented on a change in pull request #4238: [AIRFLOW-987] pass kerberos 
cli args keytab and principal to kerberos…
URL: https://github.com/apache/incubator-airflow/pull/4238#discussion_r236360636
 
 

 ##########
 File path: tests/security/test_kerberos.py
 ##########
 @@ -32,13 +33,26 @@ def setUp(self):
 
         if not configuration.conf.has_section("kerberos"):
             configuration.conf.add_section("kerberos")
-
-        configuration.conf.set("kerberos",
-                               "keytab",
+        configuration.conf.set("kerberos", "keytab",
                                os.environ['KRB5_KTNAME'])
+        keytab_from_cfg = configuration.conf.get("kerberos", "keytab")
+        self.args = Namespace(keytab=keytab_from_cfg, principal=None, pid=None,
+                              daemon=None, stdout=None, stderr=None, 
log_file=None)
 
     def test_renew_from_kt(self):
         """
         We expect no result, but a successful run. No more TypeError
         """
-        self.assertIsNone(renew_from_kt())
+        self.assertIsNone(renew_from_kt(args=self.args))
+
+    def test_args_from_cli(self):
+        """
+        We expect no result, but a run with sys.exit(1) because keytab not 
exist.
+        """
+        configuration.conf.set("kerberos", "keytab", "")
+        self.args.keytab = "test_keytab"
+
+        with self.assertRaises(SystemExit) as se:
+            renew_from_kt(args=self.args)
 
 Review comment:
   What error is this hitting? Could you add some assertion of what error is 
logged too? (Probably use 
https://docs.python.org/3.6/library/unittest.html#unittest.TestCase.assertLogs 
via the backported `unittest2` which is already a dependency)

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