40 lines
837 B
JavaScript
40 lines
837 B
JavaScript
/* Any copyright is dedicated to the Public Domain.
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* http://creativecommons.org/publicdomain/zero/1.0/ */
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const { Async } = ChromeUtils.importESModule(
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"resource://services-common/async.sys.mjs"
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);
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function run_test() {
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_("Chain a few async methods, making sure the 'this' object is correct.");
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let methods = {
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save(x, callback) {
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this.x = x;
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callback(x);
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},
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addX(x, callback) {
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callback(x + this.x);
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},
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double(x, callback) {
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callback(x * 2);
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},
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neg(x, callback) {
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callback(-x);
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},
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};
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methods.chain = Async.chain;
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// ((1 + 1 + 1) * (-1) + 1) * 2 + 1 = -3
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methods.chain(
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methods.save,
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methods.addX,
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methods.addX,
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methods.neg,
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methods.addX,
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methods.double,
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methods.addX,
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methods.save
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)(1);
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Assert.equal(methods.x, -3);
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}
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