michael@0: /* Any copyright is dedicated to the Public Domain.
michael@0:  * http://creativecommons.org/publicdomain/zero/1.0/ */
michael@0: 
michael@0: Cu.import("resource://services-common/async.js");
michael@0: 
michael@0: function run_test() {
michael@0:   _("Chain a few async methods, making sure the 'this' object is correct.");
michael@0: 
michael@0:   let methods = {
michael@0:     save: function(x, callback) {
michael@0:       this.x = x;
michael@0:       callback(x);
michael@0:     },
michael@0:     addX: function(x, callback) {
michael@0:       callback(x + this.x);
michael@0:     },
michael@0:     double: function(x, callback) {
michael@0:       callback(x * 2);
michael@0:     },
michael@0:     neg: function(x, callback) {
michael@0:       callback(-x);
michael@0:     }
michael@0:   };
michael@0:   methods.chain = Async.chain;
michael@0: 
michael@0:   // ((1 + 1 + 1) * (-1) + 1) * 2 + 1 = -3
michael@0:   methods.chain(methods.save, methods.addX, methods.addX, methods.neg,
michael@0:                 methods.addX, methods.double, methods.addX, methods.save)(1);
michael@0:   do_check_eq(methods.x, -3);
michael@0: }