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// META: title=PerformanceObserver: takeRecords
// META: script=performanceobservers.js
async_test(function (t) {
const observer = new PerformanceObserver(function (entryList, observer) {
assert_unreached('This callback should not have been called.')
});
let entries = observer.takeRecords();
checkEntries(entries, [], 'No records before observe');
observer.observe({entryTypes: ['mark']});
assert_equals(typeof(observer.takeRecords), 'function');
entries = observer.takeRecords();
checkEntries(entries, [], 'No records just from observe');
performance.mark('a');
performance.mark('b');
entries = observer.takeRecords();
checkEntries(entries, [
{entryType: 'mark', name: 'a'},
{entryType: 'mark', name: 'b'}
]);
performance.mark('c');
performance.mark('d');
performance.mark('e');
entries = observer.takeRecords();
checkEntries(entries, [
{entryType: 'mark', name: 'c'},
{entryType: 'mark', name: 'd'},
{entryType: 'mark', name: 'e'}
]);
entries = observer.takeRecords();
checkEntries(entries, [], 'No entries right after takeRecords');
observer.disconnect();
t.done();
}, "Test PerformanceObserver's takeRecords()");
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