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Test Info: Warnings
- This test gets skipped with pattern: os == 'windows'
- Manifest: browser/base/content/test/general/browser.toml
/* Any copyright is dedicated to the Public Domain.
/* eslint-disable mozilla/no-arbitrary-setTimeout */
// gBrowser.selectedTab.lastAccessed and Date.now() called from this test can't
// run concurrently, and therefore don't always match exactly.
const CURRENT_TIME_TOLERANCE_MS = 15;
function isCurrent(tab, msg) {
const DIFF = Math.abs(Date.now() - tab.lastAccessed);
Assert.lessOrEqual(
DIFF,
CURRENT_TIME_TOLERANCE_MS,
msg + " (difference: " + DIFF + ")"
);
}
function nextStep(fn) {
setTimeout(fn, CURRENT_TIME_TOLERANCE_MS + 10);
}
var originalTab;
var newTab;
function test() {
waitForExplicitFinish();
// This test assumes that time passes between operations. But if the precision
// is low enough, and the test fast enough, an operation, and a successive call
// to Date.now() will have the same time value.
SpecialPowers.pushPrefEnv(
{ set: [["privacy.reduceTimerPrecision", false]] },
function () {
originalTab = gBrowser.selectedTab;
nextStep(step2);
}
);
}
function step2() {
isCurrent(originalTab, "selected tab has the current timestamp");
newTab = BrowserTestUtils.addTab(gBrowser, "about:blank", {
skipAnimation: true,
});
nextStep(step3);
}
function step3() {
Assert.less(
newTab.lastAccessed,
Date.now(),
"new tab hasn't been selected so far"
);
gBrowser.selectedTab = newTab;
isCurrent(newTab, "new tab has the current timestamp after being selected");
nextStep(step4);
}
function step4() {
Assert.less(
originalTab.lastAccessed,
Date.now(),
"original tab has old timestamp after being deselected"
);
isCurrent(
newTab,
"new tab has the current timestamp since it's still selected"
);
gBrowser.removeTab(newTab);
finish();
}