| <!DOCTYPE HTML> |
| <html> |
| <head> |
| <script src="../resources/js-test-pre.js"></script> |
| </head> |
| <body> |
| <script> |
| description("Test PerformanceObserver mutating itself while in its callback."); |
| window.jsTestIsAsync = true; |
| |
| function assert(assertion) |
| { |
| if (!assertion()) |
| console.log(`Assertion "${assertion}" failed`); |
| } |
| |
| function wait() { |
| let now = performance.now(); |
| while (now === performance.now()) |
| continue; |
| assert(() => now < performance.now()); |
| } |
| |
| let observer = new PerformanceObserver((list) => { |
| testPassed("PerformanceObserver callback fired"); |
| |
| window.list = list; |
| window.sorted = true; |
| |
| let entries = list.getEntries(); |
| let lastStartTime = entries[0].startTime; |
| for (let i = 0; i < entries.length; ++i) { |
| let currentStartTime = entries[i].startTime; |
| if (lastStartTime > currentStartTime) { |
| sorted = false; |
| break; |
| } |
| lastStartTime = currentStartTime; |
| } |
| |
| shouldBe(`list.getEntries().length`, `8`); |
| shouldBeTrue(`sorted`); |
| |
| // Regardless of how identical start time elements are sorted, |
| // the first three values should be measures1,2,3 with 0 start time, |
| // followed by mark1. The last entry will be mark3. |
| shouldBeEqualToString(`list.getEntries()[0].entryType`, "measure"); |
| shouldBeEqualToString(`list.getEntries()[1].entryType`, "measure"); |
| shouldBeEqualToString(`list.getEntries()[2].entryType`, "measure"); |
| shouldBeEqualToString(`list.getEntries()[3].entryType`, "mark"); |
| shouldBeEqualToString(`list.getEntries()[3].name`, "mark1"); |
| shouldBeEqualToString(`list.getEntries()[7].entryType`, "mark"); |
| shouldBeEqualToString(`list.getEntries()[7].name`, "mark3"); |
| |
| // WebKit wants a stable sort based matching user expectations. |
| // The spec is currently imprecise here. |
| // <https://github.com/w3c/performance-timeline/issues/67> |
| shouldBeEqualToString(`list.getEntries()[0].name`, "measure1"); |
| shouldBeEqualToString(`list.getEntries()[1].name`, "measure2"); |
| shouldBeEqualToString(`list.getEntries()[2].name`, "measure3"); |
| shouldBeEqualToString(`list.getEntries()[3].name`, "mark1"); |
| shouldBeEqualToString(`list.getEntries()[4].name`, "mark2"); |
| shouldBeEqualToString(`list.getEntries()[5].name`, "measure-matching-mark2-1"); |
| shouldBeEqualToString(`list.getEntries()[6].name`, "measure-matching-mark2-2"); |
| shouldBeEqualToString(`list.getEntries()[7].name`, "mark3"); |
| |
| const mark2 = list.getEntries().find((entry) => entry.name == 'mark2'); |
| const mark3 = list.getEntries().find((entry) => entry.name == 'mark3'); |
| assert(() => mark2.startTime <= mark2Time); |
| assert(() => mark3Time <= mark3.startTime); |
| assert(() => mark2.startTime < mark3.startTime); |
| |
| finishJSTest(); |
| }); |
| |
| observer.observe({entryTypes: ["mark", "measure"]}); |
| |
| performance.mark("mark1"); |
| performance.measure("measure1"); |
| wait(); // Ensure mark1 !== mark2 startTime by making sure performance.now advances. |
| performance.mark("mark2"); |
| const mark2Time = performance.now(); |
| performance.measure("measure2"); |
| performance.measure("measure-matching-mark2-1", "mark2"); |
| wait(); // Ensure mark2 !== mark3 startTime by making sure performance.now advances. |
| const mark3Time = performance.now(); |
| performance.mark("mark3"); |
| assert(() => mark3Time >= mark2Time); |
| assert(() => mark3Time > mark2Time); |
| performance.measure("measure3"); |
| performance.measure("measure-matching-mark2-2", "mark2"); |
| </script> |
| <script src="../resources/js-test-post.js"></script> |
| </body> |
| </html> |
