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Test Info:
- Manifest: services/common/tests/unit/xpcshell.toml
/* Any copyright is dedicated to the Public Domain.
const { Async } = ChromeUtils.importESModule(
);
const { sinon } = ChromeUtils.importESModule(
);
function makeArray(length) {
// Start at 1 so that we can just divide by yieldEvery to get the expected
// call count. (we exp)
return Array.from({ length }, (v, i) => i + 1);
}
// Adjust if we ever change the default.
const DEFAULT_YIELD_EVERY = 50;
add_task(async function testYields() {
let spy = sinon.spy(Async, "promiseYield");
try {
await Async.yieldingForEach(makeArray(DEFAULT_YIELD_EVERY * 2), element => {
// The yield will happen *after* this function is ran.
Assert.equal(
spy.callCount,
Math.floor((element - 1) / DEFAULT_YIELD_EVERY)
);
});
} finally {
spy.restore();
}
});
add_task(async function testExistingYieldState() {
const yieldState = Async.yieldState(DEFAULT_YIELD_EVERY);
for (let i = 0; i < 15; i++) {
Assert.equal(yieldState.shouldYield(), false);
}
let spy = sinon.spy(Async, "promiseYield");
try {
await Async.yieldingForEach(
makeArray(DEFAULT_YIELD_EVERY * 2),
element => {
Assert.equal(
spy.callCount,
Math.floor((element + 15 - 1) / DEFAULT_YIELD_EVERY)
);
},
yieldState
);
} finally {
spy.restore();
}
});
add_task(async function testEarlyReturn() {
let lastElement = 0;
await Async.yieldingForEach(makeArray(DEFAULT_YIELD_EVERY), element => {
lastElement = element;
return element === 10;
});
Assert.equal(lastElement, 10);
});
add_task(async function testEaryReturnAsync() {
let lastElement = 0;
await Async.yieldingForEach(makeArray(DEFAULT_YIELD_EVERY), async element => {
lastElement = element;
return element === 10;
});
Assert.equal(lastElement, 10);
});
add_task(async function testEarlyReturnPromise() {
let lastElement = 0;
await Async.yieldingForEach(makeArray(DEFAULT_YIELD_EVERY), element => {
lastElement = element;
return new Promise(resolve => resolve(element === 10));
});
Assert.equal(lastElement, 10);
});