forked from mirrors/gecko-dev
67 lines
1.8 KiB
JavaScript
67 lines
1.8 KiB
JavaScript
"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,
|
|
frames: {
|
|
filter(rects, frame, previousFrame) {
|
|
// Ignore the focus-out animation.
|
|
if (isLikelyFocusChange(rects, frame)) {
|
|
return [];
|
|
}
|
|
return rects;
|
|
},
|
|
},
|
|
},
|
|
win
|
|
);
|
|
});
|