Tweak recurring email frequency.

britney2/policies/email.py

@@ -28,13 +28,13 @@ BOTS = {
 MESSAGE = """From: Ubuntu Release Team <noreply@canonical.com>
 To: {recipients}
 X-Proposed-Migration: notice
-Subject: [proposed-migration] {source_name} {version} stuck in {series}-proposed for {rounded_age} days.
+Subject: [proposed-migration] {source_name} {version} stuck in {series}-proposed for {rounded_age} day{plural}.
 
 Hi,
 
 {source_name} {version} needs attention.
 
-It has been stuck in {series}-proposed for {rounded_age} days.
+It has been stuck in {series}-proposed for {rounded_age} day{plural}.
 
 You either sponsored or uploaded this package, please investigate why it hasn't been approved for migration.
 
@@ -158,22 +158,24 @@ class EmailPolicy(BasePolicy, Rest):
 
     def apply_policy_impl(self, email_info, suite, source_name, source_data_tdist, source_data_srcdist, excuse):
         """Send email if package is rejected."""
+        max_age = 5 if excuse.is_valid else 1
         series = self.options.series
         version = source_data_srcdist.version
         age = excuse.daysold or 0
         rounded_age = int(age)
+        plural = '' if rounded_age == 1 else 's'
         # an item is stuck if it's
         # - old enough
         # - not blocked
         # - not temporarily rejected (e.g. by the autopkgtest policy when tests
         #   are still running)
-        stuck = age >= 3 and 'block' not in excuse.reason and \
+        stuck = age >= max_age and 'block' not in excuse.reason and \
             excuse.current_policy_verdict != PolicyVerdict.REJECTED_TEMPORARILY
 
         cached = self.cache.get(source_name, {}).get(version)
         try:
             emails, sent_age = cached
-            sent = (age - sent_age) < min(MAX_FREQUENCY, age / 2.0)
+            sent = (age - sent_age) < min(MAX_FREQUENCY, (age / 2.0) + 0.5)
         except TypeError:
             # This exception happens when source_name, version never seen before
             emails = []

tests/test_email.py

@@ -225,8 +225,9 @@ class T(unittest.TestCase):
 
     @patch('britney2.policies.email.EmailPolicy.lp_get_emails')
     @patch('britney2.policies.email.smtplib', autospec=True)
-    def test_smtp_repetition(self, smtp, lp):
+    def smtp_repetition(self, smtp, lp, valid=False, expected=None):
         """Resend mails periodically, with decreasing frequency."""
+        FakeExcuse.is_valid = valid
         lp.return_value = ['email@address.com']
         sendmail = smtp.SMTP().sendmail
         e = EmailPolicy(FakeOptions, None)
@@ -240,9 +241,19 @@ class T(unittest.TestCase):
             if sendmail.call_count > previous:
                 e.initialise(None)  # Refill e.cache from disk
                 called.append(age)
+                name, args, kwargs = sendmail.mock_calls[-1]
+                text = args[2]
+                self.assertNotIn(' 1 days.', text)
+        self.assertSequenceEqual(called, expected)
+
+    def test_smtp_repetition(self):
+        """Confirm that emails are sent at appropriate intervals."""
         # Emails were sent when daysold reached these values:
-        self.assertSequenceEqual(called, [
-            3.0, 6.0, 12.0, 24.0, 48.0, 78.0, 108.0, 138.0, 168.0, 198.0
+        self.smtp_repetition(valid=False, expected=[
+            1.0, 3.0, 7.0, 15.0, 31.0, 61.0, 91.0, 121.0, 151.0, 181.0
+        ])
+        self.smtp_repetition(valid=True, expected=[
+            5.0, 11.0, 23.0, 47.0, 77.0, 107.0, 137.0, 167.0, 197.0
         ])