diff --git a/tests/test_backend.py b/tests/test_backend.py
index ca0f2e8..d2cb08c 100644
--- a/tests/test_backend.py
+++ b/tests/test_backend.py
@@ -4,6 +4,7 @@
 import socket
 from ssl import SSLError
 import tempfile
+from unittest import mock
 import pytest
 
 from pathlib import Path
@@ -75,6 +76,16 @@ def setUpClass(cls):
     def stop_smtp(cls):
         cls.smtp_controller.stop()
 
+    def setUp(self):
+        super().setUp()
+        _, self.tmpKey = tempfile.mkstemp()
+        _, self.tmpCert = tempfile.mkstemp()
+
+    def tearDown(self):
+        super().tearDown()
+        Path(self.tmpKey).unlink()
+        Path(self.tmpCert).unlink()
+
     def test_console_backend(self):
         self.app.extensions['mailman'].backend = 'console'
         msg = EmailMessage(
@@ -344,11 +355,9 @@ def test_email_tls_attempts_starttls(self):
 
     def test_email_ssl_attempts_ssl_connection(self):
         with SmtpdContext(self.app.extensions['mailman']):
-            _, tmpKey = tempfile.mkstemp()
-            _, tmpCert = tempfile.mkstemp()
             self.app.extensions['mailman'].use_ssl = True
-            self.app.extensions['mailman'].ssl_keyfile = tmpKey
-            self.app.extensions['mailman'].ssl_certfile = tmpCert
+            self.app.extensions['mailman'].ssl_keyfile = self.tmpKey
+            self.app.extensions['mailman'].ssl_certfile = self.tmpCert
 
             backend = smtp.EmailBackend()
             self.assertTrue(backend.use_ssl)
@@ -356,8 +365,23 @@ def test_email_ssl_attempts_ssl_connection(self):
                 with backend:
                     pass
 
-            Path(tmpKey).unlink()
-            Path(tmpCert).unlink()
+    @mock.patch("ssl.SSLContext.load_cert_chain", return_value="")
+    def test_email_ssl_cached_context(self, result_mocked):
+        with SmtpdContext(self.app.extensions['mailman']):
+            self.app.extensions['mailman'].use_ssl = True
+
+            backend_one = smtp.EmailBackend()
+            backend_another = smtp.EmailBackend()
+
+            self.assertTrue(backend_one.ssl_context, backend_another.ssl_context)
+
+            self.app.extensions['mailman'].ssl_keyfile = self.tmpKey
+            self.app.extensions['mailman'].ssl_certfile = self.tmpCert
+
+            backend_one = smtp.EmailBackend()
+            backend_another = smtp.EmailBackend()
+
+            self.assertTrue(backend_one.ssl_context, backend_another.ssl_context)
 
     def test_connection_timeout_default(self):
         """The connection's timeout value is None by default."""