Repository: canjs/can-zone (js)

Issue:
The ended hook should only ever be called once
Currently it's possible for it to be called multiple times, such as when an error occurs within the initial "run" task.

Pull request description:
Ensure that ended is only called once.
In case waits are added and removed after the Zone's run promise is
complete, never call the "ended" hook again. Fixes #118

Patch:
diff --git a/lib/zone.js b/lib/zone.js
index a7f3d78..eea3710 100644
--- a/lib/zone.js
+++ b/lib/zone.js
@@ -249,7 +249,9 @@ Zone.prototype.wrap = function(fn, catchErrors){
 };
 
 Zone.prototype.end = function(){
-	this.execHook("ended");
+	if(!this.isResolved) {
+		this.execHook("ended");
+	}
 	var dfd = this.deferred;
 	if(this.errors.length) {
 		var error = this.errors[0];


Test patch:
diff --git a/test/test.js b/test/test.js
index c76e9ea..db7da1c 100644
--- a/test/test.js
+++ b/test/test.js
@@ -209,6 +209,23 @@ describe("new Zone", function(){
 			done();
 		});
 	});
+
+	it("the ended hook is only called once", function(done){
+		var count = 0;
+		new Zone({
+			ended: function() { count++; }
+		}).run(function(){
+			setTimeout(function(){}, 0);
+
+			throw new Error("some error");
+		})
+		.catch(function(){
+			setTimeout(function(){
+				assert.equal(count, 1, "Endeded called once");
+				done();
+			}, 10);
+		});
+	});
 });
 
 describe("Reusing zones", function(){