add tests for signature without timeout

test/index.js

@@ -107,6 +107,16 @@ test ('verify_signature', (t) => {
   t.deepEqual (obj, dec);
 });
 
+test ('do not fail verification if timeout unspecified', async (t) => {
+  const obj = { foo: 'bar' };
+  const str = crypto.sign_object (obj, 'baz');
+  await new Promise ((res) => {
+    setTimeout (res, 10);
+  });
+  const dec = crypto.verify_signature (str, 'baz');
+  t.deepEqual (obj, dec);
+});
+
 test ('reject tampered signatures', (t) => {
   const obj = { foo: 'bar' };
   const str = crypto.sign_object (obj, 'baz');