From 9428f40422c3e4dde5f20326d76975826faef52e Mon Sep 17 00:00:00 2001
From: Kevin Mehall <kevin@zulip.com>
Date: Tue, 3 Sep 2013 16:11:55 -0400
Subject: [PATCH] Add a `.expectOne` method to jQuery objects.

It asserts that the result set is exactly one element.

(imported from commit c78ff131deb4a13c65c2a68e4b8e09279ece3ea0)
---
 static/js/util.js | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/static/js/util.js b/static/js/util.js
index 91038e0872..05e29a9bc0 100644
--- a/static/js/util.js
+++ b/static/js/util.js
@@ -315,6 +315,15 @@ exports.enforce_arity = function util_enforce_arity(func) {
     };
 };
 
+if (typeof $ !== 'undefined') {
+    $.fn.expectOne = function () {
+        if (blueslip && this.length !== 1) {
+            blueslip.error("Expected one element in jQuery set, " + this.length + " found");
+        }
+        return this;
+    };
+}
+
 return exports;
 }());
 if (typeof module !== 'undefined') {