src/TestSessionEnvironment.php

@@ -80,6 +80,7 @@ class TestSessionEnvironment
 
     public function __construct($id = null)
     {
+        $this->constructExtensions();
         if ($id) {
             $this->id = $id;
         }

src/TestSessionHTTPMiddleware.php

@@ -69,7 +69,7 @@ class TestSessionHTTPMiddleware implements HTTPMiddleware
             $mailer = $testState->mailer;
             Injector::inst()->registerService(new $mailer(), Mailer::class);
             Email::config()->set("send_all_emails_to", null);
-            Email::config()->set('admin_email', 'no-reply@example.com');
+            Email::config()->update('admin_email', 'no-reply@example.com');
         }
 
         // Connect to the test session database