50 lines
2.2 KiB
JavaScript
50 lines
2.2 KiB
JavaScript
/* Any copyright is dedicated to the Public Domain.
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http://creativecommons.org/publicdomain/zero/1.0/ */
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"use strict";
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const LABELS_STARTUP_CACHE_REQUESTS = {
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HitMemory: 0,
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HitDisk: 1,
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Miss: 2,
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};
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add_task(async function () {
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// Turn off tab preloading to avoid issues with RemoteController.js
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await SpecialPowers.pushPrefEnv({
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set: [["browser.newtab.preload", false]],
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});
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Services.obs.notifyObservers(null, "startupcache-invalidate");
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Services.telemetry.getSnapshotForHistograms("main", true);
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let newWin = await BrowserTestUtils.openNewBrowserWindow();
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let snapshot = Services.telemetry.getSnapshotForHistograms("main", true);
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function histValue(label) {
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return snapshot.parent.STARTUP_CACHE_REQUESTS.values[label] || 0;
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}
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Assert.equal(histValue(LABELS_STARTUP_CACHE_REQUESTS.HitMemory), 0);
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Assert.equal(histValue(LABELS_STARTUP_CACHE_REQUESTS.HitDisk), 0);
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Assert.notEqual(histValue(LABELS_STARTUP_CACHE_REQUESTS.Miss), 0);
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await BrowserTestUtils.closeWindow(newWin);
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newWin = await BrowserTestUtils.openNewBrowserWindow();
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snapshot = Services.telemetry.getSnapshotForHistograms("main", true);
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Assert.notEqual(histValue(LABELS_STARTUP_CACHE_REQUESTS.HitMemory), 0);
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Assert.equal(histValue(LABELS_STARTUP_CACHE_REQUESTS.HitDisk), 0);
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// Here and below, 50 is just a nice round number that should be well over
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// what we should observe under normal circumstances, and well under what
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// we should see if something is seriously wrong. It won't catch everything,
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// but it's better than nothing, and better than a test that cries wolf.
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Assert.less(histValue(LABELS_STARTUP_CACHE_REQUESTS.Miss), 50);
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await BrowserTestUtils.closeWindow(newWin);
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Services.obs.notifyObservers(null, "startupcache-invalidate", "memoryOnly");
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newWin = await BrowserTestUtils.openNewBrowserWindow();
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snapshot = Services.telemetry.getSnapshotForHistograms("main", true);
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Assert.less(histValue(LABELS_STARTUP_CACHE_REQUESTS.HitMemory), 50);
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Assert.notEqual(histValue(LABELS_STARTUP_CACHE_REQUESTS.HitDisk), 0);
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// Some misses can come through - just ensure it's a small number
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Assert.less(histValue(LABELS_STARTUP_CACHE_REQUESTS.Miss), 50);
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await BrowserTestUtils.closeWindow(newWin);
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});
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