dav_base.emails: make coverage happy

dav_base/tests/test_emails.py

@@ -43,4 +43,24 @@ class TestCase(EmailTestMixin, SimpleTestCase):
         self.assertSender(mail)
         self.assertRecipients(mail, [recipient])
         self.assertSubject(mail, '')
-        self.assertBody(mail, 'MAILBODY')
+        self.assertBody(mail, 'MAILBODY\n')
+
+    def test_send_extra_context(self):
+        recipient = 'root@localhost'
+
+        class ConcreteMail(AbstractMail):  # pylint: disable=too-few-public-methods
+            _template_name = MAIL_TEMPLATE
+
+            def _get_recipients(self):
+                return [recipient]
+
+            def _get_body(self, context=None):
+                context = {'var1': 'Here is',
+                           'var2': ' extra context. '}
+                return super()._get_body(context)
+
+        email = ConcreteMail()
+        email.send()
+
+        mail = django_mail.outbox[0]
+        self.assertBody(mail, 'Here is extra context. MAILBODY\n')