diff --git a/packages/config/DittoConfig.test.ts b/packages/config/DittoConfig.test.ts
index fc2e472c..a61a0c77 100644
--- a/packages/config/DittoConfig.test.ts
+++ b/packages/config/DittoConfig.test.ts
@@ -1,4 +1,4 @@
-import { assertEquals } from '@std/assert';
+import { assertEquals, assertThrows } from '@std/assert';
 
 import { DittoConfig } from './DittoConfig.ts';
 
@@ -17,3 +17,16 @@ Deno.test('DittoConfig', async (t) => {
     assertEquals(config.pubkey, '1ba0c5ed1bbbf3b7eb0d7843ba16836a0201ea68a76bafcba507358c45911ff6');
   });
 });
+
+Deno.test('DittoConfig defaults', async (t) => {
+  const env = new Map<string, string>();
+  const config = new DittoConfig(env);
+
+  await t.step('nsec throws', () => {
+    assertThrows(() => config.nsec);
+  });
+
+  await t.step('port', () => {
+    assertEquals(config.port, 4036);
+  });
+});