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-rw-r--r--services/common/tests/unit/test_async_chain.js30
1 files changed, 30 insertions, 0 deletions
diff --git a/services/common/tests/unit/test_async_chain.js b/services/common/tests/unit/test_async_chain.js
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index 000000000..c3abef296
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+++ b/services/common/tests/unit/test_async_chain.js
@@ -0,0 +1,30 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+Cu.import("resource://services-common/async.js");
+
+function run_test() {
+ _("Chain a few async methods, making sure the 'this' object is correct.");
+
+ let methods = {
+ save: function(x, callback) {
+ this.x = x;
+ callback(x);
+ },
+ addX: function(x, callback) {
+ callback(x + this.x);
+ },
+ double: function(x, callback) {
+ callback(x * 2);
+ },
+ neg: function(x, callback) {
+ callback(-x);
+ }
+ };
+ methods.chain = Async.chain;
+
+ // ((1 + 1 + 1) * (-1) + 1) * 2 + 1 = -3
+ methods.chain(methods.save, methods.addX, methods.addX, methods.neg,
+ methods.addX, methods.double, methods.addX, methods.save)(1);
+ do_check_eq(methods.x, -3);
+}