diff --git a/test/create-test-server.js b/test/create-test-server.js
index 39f587f..bb1655a 100644
--- a/test/create-test-server.js
+++ b/test/create-test-server.js
@@ -15,6 +15,8 @@ test('server instance exposes useful properties', async t => {
 
 	t.true(typeof server.url === 'string');
 	t.true(typeof server.sslUrl === 'string');
+	t.true(typeof server.port === 'number');
+	t.true(typeof server.sslPort === 'number');
 	t.true(typeof server.caCert === 'string');
 	t.true(typeof server.listen === 'function');
 	t.true(typeof server.close === 'function');