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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /workers/worker_timer_nesting_level.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<title>Worker: Timer Nesting Level</title>
<Script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
'use strict'
/**
* This test includes following four test stages.
* 1. CheckInitialValue: Checking the initial value of worker's current timer
* nesting level after the worker's top level script is loaded. The result
* is expected as 0.
* 2. TestSetInterval: Checking the worker's current timer nesting level with
* setInterval with following steps
* 1. call setInterval(callback, 0) to create a repeating timer.
* 2. checking the current timer nesting level in the callback. The value
* should increase every time executing the callback until it reaches the
* maximun nesting level(5).
* 3. Checking the worker's current timer nesting level with immediately
* resolved promise.
* 4. Checking the the time duration between two callback launching.
* 3. TestSetTimeout: Checking the worker's current timer nesting level with
* setTimeout. This stage has similar test steps with TestSetInterval.
* The difference is this stage using the recursive setTimeout to accumulate
* the timer nesting level.
* 4. CheckNoTimer: Checking the situation which the worker has no pending
* timer. The result is expected as 0.
*/
let testStages = ["CheckInitialValue",
"TestSetInterval",
"TestSetTimeout",
"CheckNoTimer"];
promise_test(async function(t) {
let result = await new Promise( (resolve, reject) => {
let worker = new Worker("resources/worker.js");
worker.onmessage = (e) => {
if (e.data.status === "FAIL") {
resolve(e.data);
return;
}
if (testStages.length !== 0) {
worker.postMessage(testStages.shift());
} else {
resolve({status: "PASS", msg: "Timer nesting level for workers"});
}
};
});
assert_true(result.status === "PASS", result.msg);
}, 'Worker timer nesting level');
</script>