| <!DOCTYPE HTML> |
| <html> |
| <head onload> |
| <meta charset="utf-8" /> |
| <title>This test validates the behavior of read and clear operation in onresourcetimingbufferfull callback of resource timing.</title> |
| <link rel="author" title="Intel" href="http://www.intel.com/" /> |
| <link rel="help" href="http://www.w3.org/TR/resource-timing/#performanceresourcetiming"/> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="resources/buffer-full-utilities.js"></script> |
| </head> |
| <body> |
| <script> |
| const resource_timing_buffer_size = 1; |
| let global_buffer = []; |
| let eventFired = false; |
| |
| setup(() => { |
| clearBufferAndSetSize(resource_timing_buffer_size); |
| let store_and_clear = function() { |
| const entryList = performance.getEntriesByType('resource'); |
| entryList.forEach(function (entry) { |
| global_buffer.push(entry); |
| }); |
| performance.clearResourceTimings(); |
| eventFired = true; |
| } |
| performance.addEventListener('resourcetimingbufferfull', store_and_clear); |
| }); |
| |
| let overflowTheBuffer = () => { |
| return new Promise(resolve => { |
| // This resource overflows the entry buffer, and goes into the secondary buffer. |
| appendScript('resources/empty_script.js', resolve); |
| }); |
| }; |
| |
| let testThatBufferContainsTheRightResources = () => { |
| let entries = performance.getEntriesByType('resource'); |
| assert_equals(entries.length, 1, |
| "Only the last entry should be stored in resource timing buffer since it's cleared once it overflows."); |
| assert_equals(global_buffer.length, 1, '1 resource timing entry should be moved to global buffer.'); |
| assert_true(global_buffer[0].name.includes('empty.js'), "empty.js is in the global buffer"); |
| assert_true(entries[0].name.includes('empty_script.js'), "empty_script.js is in the entries buffer"); |
| }; |
| |
| promise_test(async () => { |
| await fillUpTheBufferWithSingleResource("resources/empty.js"); |
| await overflowTheBuffer(); |
| await waitForEventToFire(); |
| testThatBufferContainsTheRightResources(); |
| }, "Test that entries overflowing the buffer trigger the buffer full event, can be stored, and find themselves in the primary buffer after it's cleared."); |
| </script> |
| </body> |
| </html> |
