1 files changed, 30 insertions, 0 deletions
diff --git a/js/src/tests/non262/AsyncIterator/prototype/take-drop-throw-eagerly-on-negative.js b/js/src/tests/non262/AsyncIterator/prototype/take-drop-throw-eagerly-on-negative.js
new file mode 100644
index 0000000000..f21c78e650
--- /dev/null
+++ b/js/src/tests/non262/AsyncIterator/prototype/take-drop-throw-eagerly-on-negative.js
@@ -0,0 +1,30 @@
+// |reftest| skip-if(!this.hasOwnProperty('AsyncIterator'))
+
+//
+//
+/*---
+esid: pending
+description: `take` and `drop` throw eagerly when passed negative numbers, after rounding towards 0.
+info: >
+  Iterator Helpers proposal 2.1.6.4 and 2.1.6.5
+features: [iterator-helpers]
+---*/
+
+async function* gen() {}
+const iter = gen();
+const methods = [
+  value => iter.take(value),
+  value => iter.drop(value),
+];
+
+for (const method of methods) {
+  assertThrowsInstanceOf(() => method(-1), RangeError);
+  assertThrowsInstanceOf(() => method(-Infinity), RangeError);
+
+  // Both -0 and -0.9 round towards 0.
+  method(-0);
+  method(-0.9);
+}
+
+if (typeof reportCompare == 'function')
+  reportCompare(0, 0);