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/* Any copyright is dedicated to the Public Domain.
* http://creativecommons.org/publicdomain/zero/1.0/ */
const { Async } = ChromeUtils.importESModule(
"resource://services-common/async.sys.mjs"
);
function run_test() {
_("Chain a few async methods, making sure the 'this' object is correct.");
let methods = {
save(x, callback) {
this.x = x;
callback(x);
},
addX(x, callback) {
callback(x + this.x);
},
double(x, callback) {
callback(x * 2);
},
neg(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);
Assert.equal(methods.x, -3);
}
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