| <!DOCTYPE html> <!-- webkit-test-runner [ internal:UndoManagerAPIEnabled=true ] --> |
| <html> |
| <meta charset="utf8"> |
| <head> |
| <script src="../../resources/js-test.js"></script> |
| <script src="../editing.js"></script> |
| <script> |
| jsTestIsAsync = true; |
| |
| function objectCountAfterSimulatingMemoryPressureAndGarbageCollection() { |
| internals.beginSimulatedMemoryPressure(); |
| internals.endSimulatedMemoryPressure(); |
| GCController.collect(); |
| return GCController.getJSObjectCount(); |
| } |
| |
| async function runTest() { |
| description("Verifies that JSUndoItems are deleted when they are no longer needed by the platform clipboard. This test requires WebKitTestRunner."); |
| |
| if (!window.GCController) |
| return; |
| |
| editor = document.getElementById("editor"); |
| editor.focus(); |
| |
| const undoItemCount = 200; |
| |
| for (let i = 0; i < undoItemCount; ++i) { |
| document.undoManager.addItem(new UndoItem({ |
| label: "", |
| undo: () => { }, |
| redo: () => { } |
| })); |
| } |
| |
| for (let i = 0; i < undoItemCount; ++i) |
| document.execCommand("Undo"); |
| |
| objectCountBeforeClearingUndoStack = objectCountAfterSimulatingMemoryPressureAndGarbageCollection(); |
| |
| selectAllCommand(); |
| typeCharacterCommand("E"); |
| |
| // Wait until almost all of the wrappers are collected. For each UndoItem, we expect a total of 3 wrappers: |
| // one each for the undo and redo handlers, and one for the UndoItem itself. However, we also give ourselves |
| // some wiggle room for additional wrappers created when calling some testing helper functions. This is |
| // still a useful test, since it will time out in the case where either our undo items or their undo/redo |
| // handlers are not properly relinquished once they're no longer needed. |
| const minimumNumberOfWrappersToCollectBeforePassing = 3 * undoItemCount - 20; |
| objectCountAfterClearingUndoStack = objectCountBeforeClearingUndoStack; |
| while (objectCountBeforeClearingUndoStack - objectCountAfterClearingUndoStack < minimumNumberOfWrappersToCollectBeforePassing) { |
| await new Promise(resolve => setTimeout(resolve, 100)); |
| objectCountAfterClearingUndoStack = objectCountAfterSimulatingMemoryPressureAndGarbageCollection(); |
| } |
| |
| shouldBeGreaterThanOrEqual("objectCountBeforeClearingUndoStack - objectCountAfterClearingUndoStack", `${minimumNumberOfWrappersToCollectBeforePassing}`); |
| finishJSTest(); |
| } |
| </script> |
| </head> |
| <body onload="runTest()"> |
| <div contenteditable id="editor"></div> |
| <pre id="description"></pre> |
| <pre id="console"></pre> |
| </body> |
| </html> |
