diff --git a/test/index.js b/test/index.js
index 553a01a..30d2d4b 100644
--- a/test/index.js
+++ b/test/index.js
@@ -40,3 +40,14 @@ test ('copy object', (t) => {
   t.is (copy.foo, 'baz');
   t.is (obj.foo, 'bar');
 });
+
+test ('run regex', (t) => {
+  const data = 'foobarfoo';
+  const regex = /foo/gu;
+  let count = 0;
+  util.run_regex(regex,data,(res)=>{
+    t.is(res[0], 'foo');
+    count++;
+  })
+  t.is(count, 2);
+});