1 files changed, 35 insertions, 0 deletions
diff --git a/js/src/tests/non262/AsyncIterator/prototype/lazy-methods-throw-eagerly-on-next-non-callable.js b/js/src/tests/non262/AsyncIterator/prototype/lazy-methods-throw-eagerly-on-next-non-callable.js
new file mode 100644
index 0000000000..489887d020
--- /dev/null
+++ b/js/src/tests/non262/AsyncIterator/prototype/lazy-methods-throw-eagerly-on-next-non-callable.js
@@ -0,0 +1,35 @@
+// |reftest| skip-if(!this.hasOwnProperty('AsyncIterator'))
+
+//
+//
+/*---
+esid: pending
+description: Lazy %AsyncIterator.prototype% methods throw eagerly when `next` is non-callable.
+info: >
+  Iterator Helpers proposal 1.1.1
+features: [iterator-helpers]
+---*/
+
+async function* gen(x) { yield x; }
+const methods = [
+  next => AsyncIterator.prototype.map.bind({next}, x => x),
+  next => AsyncIterator.prototype.filter.bind({next}, x => x),
+  next => AsyncIterator.prototype.take.bind({next}, 1),
+  next => AsyncIterator.prototype.drop.bind({next}, 0),
+  next => AsyncIterator.prototype.asIndexedPairs.bind({next}),
+  next => AsyncIterator.prototype.flatMap.bind({next}, gen),
+];
+
+for (const method of methods) {
+  assertThrowsInstanceOf(method(0), TypeError);
+  assertThrowsInstanceOf(method(false), TypeError);
+  assertThrowsInstanceOf(method(undefined), TypeError);
+  assertThrowsInstanceOf(method(null), TypeError);
+  assertThrowsInstanceOf(method(''), TypeError);
+  assertThrowsInstanceOf(method(Symbol('')), TypeError);
+  assertThrowsInstanceOf(method({}), TypeError);
+  assertThrowsInstanceOf(method([]), TypeError);
+}
+
+if (typeof reportCompare == 'function')
+  reportCompare(0, 0);