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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /testing/web-platform/tests/html/webappapis/microtask-queuing/queue-microtask.window.js
parentInitial commit. (diff)
downloadfirefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz
firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'testing/web-platform/tests/html/webappapis/microtask-queuing/queue-microtask.window.js')
-rw-r--r--testing/web-platform/tests/html/webappapis/microtask-queuing/queue-microtask.window.js45
1 files changed, 45 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/webappapis/microtask-queuing/queue-microtask.window.js b/testing/web-platform/tests/html/webappapis/microtask-queuing/queue-microtask.window.js
new file mode 100644
index 0000000000..78cdcfc5d9
--- /dev/null
+++ b/testing/web-platform/tests/html/webappapis/microtask-queuing/queue-microtask.window.js
@@ -0,0 +1,45 @@
+"use strict";
+
+// This does not work as you expect because mutation observer compound microtasks are confusing.
+// Basically you can only use it once per test.
+function queueMicrotaskViaMO(cb) {
+ const observer = new MutationObserver(cb);
+ const node = document.createTextNode("");
+ observer.observe(node, { characterData: true });
+ node.data = "foo";
+}
+
+// Need to use promise_test to get sequential ordering; otherwise the global mutation observer
+// compound microtask business screws us over.
+
+promise_test(() => {
+ return new Promise(resolve => {
+ const happenings = [];
+
+ queueMicrotaskViaMO(() => happenings.push("x"));
+ queueMicrotask(() => happenings.push("a"));
+
+ queueMicrotask(() => {
+ assert_array_equals(happenings, ["x", "a"]);
+ resolve();
+ });
+ });
+}, "It interleaves with MutationObservers as expected");
+
+promise_test(() => {
+ return new Promise(resolve => {
+ const happenings = [];
+
+ queueMicrotask(() => happenings.push("a"));
+ Promise.reject().catch(() => happenings.push("x"));
+ queueMicrotaskViaMO(() => happenings.push(1));
+ Promise.resolve().then(() => happenings.push("y"));
+ queueMicrotask(() => happenings.push("b"));
+ queueMicrotask(() => happenings.push("c"));
+
+ queueMicrotask(() => {
+ assert_array_equals(happenings, ["a", "x", 1, "y", "b", "c"]);
+ resolve();
+ });
+ });
+}, "It interleaves with MutationObservers and promises together as expected");