The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/services/common/tests/unit/test_async_chain.js	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,30 @@
     1.4 +/* Any copyright is dedicated to the Public Domain.
     1.5 + * http://creativecommons.org/publicdomain/zero/1.0/ */
     1.6 +
     1.7 +Cu.import("resource://services-common/async.js");
     1.8 +
     1.9 +function run_test() {
    1.10 +  _("Chain a few async methods, making sure the 'this' object is correct.");
    1.11 +
    1.12 +  let methods = {
    1.13 +    save: function(x, callback) {
    1.14 +      this.x = x;
    1.15 +      callback(x);
    1.16 +    },
    1.17 +    addX: function(x, callback) {
    1.18 +      callback(x + this.x);
    1.19 +    },
    1.20 +    double: function(x, callback) {
    1.21 +      callback(x * 2);
    1.22 +    },
    1.23 +    neg: function(x, callback) {
    1.24 +      callback(-x);
    1.25 +    }
    1.26 +  };
    1.27 +  methods.chain = Async.chain;
    1.28 +
    1.29 +  // ((1 + 1 + 1) * (-1) + 1) * 2 + 1 = -3
    1.30 +  methods.chain(methods.save, methods.addX, methods.addX, methods.neg,
    1.31 +                methods.addX, methods.double, methods.addX, methods.save)(1);
    1.32 +  do_check_eq(methods.x, -3);
    1.33 +}