test for arity shows more bugs

ljharb · Jun 7, 2011 · da698d6 · da698d6
1 parent 3d5057a
commit da698d6
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/index.js b/index.js
@@ -49,6 +49,12 @@ Traverse.prototype.reduce = function (cb, init) {
 };
 
 Traverse.prototype.deepEqual = function (obj) {
+    if (arguments.length !== 1) {
+        throw new Error(
+            'deepEqual requires exactly one object to compare against'
+        );
+    }
+
     var equal = true;
     var node = obj;