fast/editing/document-leak-altered-text-field.html is flaky

https://bugs.webkit.org/show_bug.cgi?id=258289

Reviewed by Ryosuke Niwa.

Our GC is conservative so instead of constructing one document and naming sure
it gets GC'd, we now construct 30 and make sure at least one of them gets GC'd.

* LayoutTests/fast/editing/document-leak-altered-text-field-expected.txt:
* LayoutTests/fast/editing/document-leak-altered-text-field.html:

Canonical link: https://commits.webkit.org/265339@main

LayoutTests/fast/editing/document-leak-altered-text-field-expected.txt

@@ -3,7 +3,6 @@ Make sure that the document doesn't leak if it contains a modified text input fi
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
-PASS w.document.getElementById('textField').value is "test"
 PASS The Document didn't leak
 PASS successfullyParsed is true
 

LayoutTests/fast/editing/document-leak-altered-text-field.html

@@ -6,40 +6,52 @@
 description("Make sure that the document doesn't leak if it contains a modified text input field.");
 jsTestIsAsync = true;
 
-onload = () => {
-    w = open("resources/document-leak-altered-text-field-popup.html");
-    w.onload = () => {
-        // The navigation needs to happen outside the load event in order to create a history item and put the
-        // page in the back/forward cache.
-        setTimeout(async () => {
-            documentIdentifier = internals.documentIdentifier(w.document);
-            // Type in the input field.
-            w.document.getElementById("textField").focus();
-            w.document.execCommand("InsertText", false, "test");
-            shouldBeEqualToString("w.document.getElementById('textField').value", "test");
-
-            // Submit the form, which will navigate the page.
-            w.document.getElementById("submitButton").click();
+let documentIdentifiers = [];
+const popupCount = 30;
 
-            w = null;
-            handle = setInterval(() => {
-                internals.clearBackForwardCache();
-                gc();
+function checkForLeaks()
+{
+     handle = setInterval(() => {
+         internals.clearBackForwardCache();
+         gc();
+         for (let documentIdentifier of documentIdentifiers) {
                 if (!internals.isDocumentAlive(documentIdentifier)) {
                     clearInterval(handle);
                     clearTimeout(timeoutHandle);
                     testPassed("The Document didn't leak");
                     finishJSTest();
                     return;
                 }
-            }, 50);
-            timeoutHandle = setTimeout(() => {
-                testFailed("The document leaked");
-                clearInterval(handle);
-                finishJSTest();
-            }, 10000);
-        }, 0);
-    };
+        }
+    }, 50);
+    timeoutHandle = setTimeout(() => {
+        testFailed("The document leaked");
+        clearInterval(handle);
+        finishJSTest();
+    }, 10000);
+}
+
+onload = () => {
+    for (let i = 0; i < popupCount; i++) {
+        let w = open("resources/document-leak-altered-text-field-popup.html");
+        w.onload = () => {
+            // The navigation needs to happen outside the load event in order to create a history item and put the
+            // page in the back/forward cache.
+            setTimeout(async () => {
+                documentIdentifiers.push(internals.documentIdentifier(w.document));
+
+                // Type in the input field.
+                w.document.getElementById("textField").focus();
+                w.document.execCommand("InsertText", false, "test");
+
+                // Submit the form, which will navigate the page.
+                w.document.getElementById("submitButton").click();
+
+                if (documentIdentifiers.length == popupCount)
+                    checkForLeaks();
+            }, 0);
+        };
+    }
 };
 </script>
 </body>