| <!DOCTYPE HTML> |
| <html> |
| <head onload> |
| <meta charset="utf-8" /> |
| <title>This test validates that decreasing the buffer size in onresourcetimingbufferfull callback does not result in extra entries being dropped.</title> |
| <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 = 2; |
| let eventFired = false; |
| setup(() => { |
| // Get the browser into a consistent state. |
| clearBufferAndSetSize(resource_timing_buffer_size); |
| let resize = () => { |
| performance.setResourceTimingBufferSize(resource_timing_buffer_size - 1); |
| eventFired = true; |
| } |
| performance.addEventListener('resourcetimingbufferfull', resize); |
| }); |
| |
| let overflowTheBuffer = () => { |
| return new Promise(resolve => { |
| // This resource overflows the entry buffer, and goes into the secondary buffer. |
| // Since the buffer size doesn't increase, it will eventually be dropped. |
| appendScript('resources/empty_script.js', resolve); |
| }); |
| }; |
| |
| let testThatBufferContainsTheRightResources = () => { |
| let entries = performance.getEntriesByType('resource'); |
| assert_equals(entries.length, 2, |
| 'Both entries should be stored in resource timing buffer since it decreased its limit only after it overflowed.'); |
| assert_true(entries[0].name.includes('empty.js'), "empty.js is in the entries buffer"); |
| assert_true(entries[1].name.includes('empty.js?second'), "empty.js?second is in the entries buffer"); |
| }; |
| |
| promise_test(async () => { |
| await fillUpTheBufferWithTwoResources('resources/empty.js'); |
| await overflowTheBuffer(); |
| await waitForEventToFire(); |
| testThatBufferContainsTheRightResources(); |
| }, "Test that decreasing the buffer limit during the callback does not drop entries"); |
| </script> |
| </body> |
| </html> |
