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-rw-r--r--tests/handlers/test_send_email.py57
1 files changed, 56 insertions, 1 deletions
diff --git a/tests/handlers/test_send_email.py b/tests/handlers/test_send_email.py
index 6f77b1237c..da4bf8b582 100644
--- a/tests/handlers/test_send_email.py
+++ b/tests/handlers/test_send_email.py
@@ -23,7 +23,7 @@ from twisted.internet.defer import ensureDeferred
 from twisted.mail import interfaces, smtp
 
 from tests.server import FakeTransport
-from tests.unittest import HomeserverTestCase
+from tests.unittest import HomeserverTestCase, override_config
 
 
 @implementer(interfaces.IMessageDelivery)
@@ -110,3 +110,58 @@ class SendEmailHandlerTestCase(HomeserverTestCase):
         user, msg = message_delivery.messages.pop()
         self.assertEqual(str(user), "foo@bar.com")
         self.assertIn(b"Subject: test subject", msg)
+
+    @override_config(
+        {
+            "email": {
+                "notif_from": "noreply@test",
+                "force_tls": True,
+            },
+        }
+    )
+    def test_send_email_force_tls(self):
+        """Happy-path test that we can send email to an Implicit TLS server."""
+        h = self.hs.get_send_email_handler()
+        d = ensureDeferred(
+            h.send_email(
+                "foo@bar.com", "test subject", "Tests", "HTML content", "Text content"
+            )
+        )
+        # there should be an attempt to connect to localhost:465
+        self.assertEqual(len(self.reactor.sslClients), 1)
+        (
+            host,
+            port,
+            client_factory,
+            contextFactory,
+            _timeout,
+            _bindAddress,
+        ) = self.reactor.sslClients[0]
+        self.assertEqual(host, "localhost")
+        self.assertEqual(port, 465)
+
+        # wire it up to an SMTP server
+        message_delivery = _DummyMessageDelivery()
+        server_protocol = smtp.ESMTP()
+        server_protocol.delivery = message_delivery
+        # make sure that the server uses the test reactor to set timeouts
+        server_protocol.callLater = self.reactor.callLater  # type: ignore[assignment]
+
+        client_protocol = client_factory.buildProtocol(None)
+        client_protocol.makeConnection(FakeTransport(server_protocol, self.reactor))
+        server_protocol.makeConnection(
+            FakeTransport(
+                client_protocol,
+                self.reactor,
+                peer_address=IPv4Address("TCP", "127.0.0.1", 1234),
+            )
+        )
+
+        # the message should now get delivered
+        self.get_success(d, by=0.1)
+
+        # check it arrived
+        self.assertEqual(len(message_delivery.messages), 1)
+        user, msg = message_delivery.messages.pop()
+        self.assertEqual(str(user), "foo@bar.com")
+        self.assertIn(b"Subject: test subject", msg)