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"use strict";
/**
* WHOA THERE: We should never be adding new things to EXPECTED_REFLOWS.
* Instead of adding reflows to the list, you should be modifying your code to
* avoid the reflow.
*
* See https://firefox-source-docs.mozilla.org/performance/bestpractices.html
* for tips on how to do that.
*/
const EXPECTED_REFLOWS = [
/**
* Nothing here! Please don't add anything new!
*/
];
/**
* This test ensures that there are no unexpected
* uninterruptible reflows when closing windows. When the
* window is closed, the test waits until the original window
* has activated.
*/
add_task(async function () {
// Ensure that this browser window starts focused. This seems to be
// necessary to avoid intermittent failures when running this test
// on repeat.
await new Promise(resolve => {
waitForFocus(resolve, window);
});
let win = await BrowserTestUtils.openNewBrowserWindow();
await new Promise(resolve => {
waitForFocus(resolve, win);
});
// At the time of writing, there are no reflows on window closing.
// Mochitest will fail if we have no assertions, so we add one here
// to make sure nobody adds any new ones.
Assert.equal(
EXPECTED_REFLOWS.length,
0,
"We shouldn't have added any new expected reflows for window close."
);
await withPerfObserver(
async function () {
let promiseOrigBrowserFocused = TestUtils.waitForCondition(() => {
return Services.focus.activeWindow == window;
});
await BrowserTestUtils.closeWindow(win);
await promiseOrigBrowserFocused;
},
{
expectedReflows: EXPECTED_REFLOWS,
},
win
);
});
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