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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /js/src/jit-test/tests/promise/debugger-reaction-does-not-resolve.js
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'js/src/jit-test/tests/promise/debugger-reaction-does-not-resolve.js')
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1 files changed, 71 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/promise/debugger-reaction-does-not-resolve.js b/js/src/jit-test/tests/promise/debugger-reaction-does-not-resolve.js
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+++ b/js/src/jit-test/tests/promise/debugger-reaction-does-not-resolve.js
@@ -0,0 +1,71 @@
+// Promise.race(...) may add a dummy PromiseReaction which is only used for the
+// debugger. Ensure that this dummy reaction can't influence the normal Promise
+// resolution behaviour.
+//
+// See BlockOnPromise when called from PerformPromiseRace for when this dummy
+// reaction is created.
+
+function newPromiseCapability() {
+ var resolve, reject, promise = new Promise(function(r1, r2) {
+ resolve = r1;
+ reject = r2;
+ });
+ return {promise, resolve, reject};
+}
+
+function neverCalled() {
+ // Quit with non-zero exit code to ensure a test suite error is shown,
+ // even when this function is called within promise handlers which normally
+ // swallow any exceptions.
+ quit(1);
+}
+
+var c = 0;
+var g_resolve;
+
+var resolvedValues = [];
+
+function resolveCapability(v) {
+ resolvedValues.push(v);
+}
+
+class P extends Promise {
+ constructor(executor) {
+ // Only the very first object created through this constructor gets
+ // special treatment, all other invocations create built-in Promise
+ // objects.
+ if (c++ > 1) {
+ return new Promise(executor);
+ }
+
+ executor(resolveCapability, neverCalled);
+
+ var {promise, resolve} = newPromiseCapability();
+ g_resolve = resolve;
+
+ // Use an async function to create a Promise without resolving functions.
+ var p = async function(){ await promise; return 456; }();
+
+ // Ensure the species constructor is not the built-in Promise constructor
+ // to avoid falling into the fast path.
+ p.constructor = {
+ [Symbol.species]: P
+ };
+
+ return p;
+ }
+}
+
+var {promise: alwaysPending} = newPromiseCapability();
+
+// The promise returned from race() should never be resolved.
+P.race([alwaysPending]).then(neverCalled, neverCalled);
+
+g_resolve(123);
+
+drainJobQueue();
+
+// Check |resolvedValues| to ensure resolving functions were properly called.
+assertEq(resolvedValues.length, 2);
+assertEq(resolvedValues[0], alwaysPending);
+assertEq(resolvedValues[1], 456);