fix jshint error

bekzod · bekzod · commit 6308c5f51df6 · 2017-06-05T10:37:43.000+05:00
diff --git a/test/.jshintrc b/test/.jshintrc
@@ -1,5 +1,6 @@
 {
   "mocha": true,
   "esnext": true,
-  "node": true
+  "node": true,
+  "expr": true
 }
