main: Add more tests for donor_import

Throw a CommandError when the path is not found, similar to what
reporead does and add a test for decode_subject.

main/management/commands/donor_import.py

@@ -23,7 +23,7 @@
 from parse import parse
 
 from django.db.utils import Error as DBError
-from django.core.management.base import BaseCommand
+from django.core.management.base import BaseCommand, CommandError
 from main.models import Donor
 
 
@@ -91,8 +91,7 @@ def handle(self, *args, **options):
             directory = options['maildir']
             maildir = mailbox.Maildir(directory, create=False)
         except mailbox.Error:
-            logger.error(u"Failed to open maildir: '%s'", directory)
-            return 0
+            raise CommandError(u"Failed to open maildir")
 
         for msg in maildir:
             subject = msg.get('subject', '')

main/tests/test_donor_import.py

+# -*- coding: utf-8 -*-
+
+from email.header import Header
+
 from django.test import SimpleTestCase
+from django.core.management import call_command
+from django.core.management.base import CommandError
 
 
 from main.management.commands.donor_import import Command
@@ -20,9 +26,23 @@ def test_parse_subject(self):
         output = self.command.parse_subject(valid)
         self.assertEqual(output, u'John Doe')
 
-
     def test_parse_name(self):
         self.assertEqual(self.command.sanitize_name(u'1244'), u'')
         self.assertEqual(self.command.sanitize_name(u'John Doe'), u'John Doe')
         self.assertEqual(self.command.sanitize_name(u' John Doe '), u'John Doe')
         self.assertEqual(self.command.sanitize_name(u'John Doe 23'), u'John Doe')
+
+    def test_decode_subject(self):
+        text = u'メイル'
+        subject = str(Header(text, 'utf-8'))
+        self.assertEqual(self.command.decode_subject(subject), text)
+
+    def test_invalid_args(self):
+        with self.assertRaises(CommandError) as e:
+            call_command('donor_import')
+        self.assertIn('Error: too few arguments', str(e.exception))
+
+    def test_invalid_path(self):
+        with self.assertRaises(CommandError) as e:
+            call_command('donor_import', '/tmp/non-existant')
+        self.assertIn('Failed to open maildir', str(e.exception))