1 files changed, 25 insertions, 0 deletions
diff --git a/js/src/tests/non262/Iterator/from/return-iterator-if-iterable.js b/js/src/tests/non262/Iterator/from/return-iterator-if-iterable.js
new file mode 100644
index 0000000000..e83e25185d
--- /dev/null
+++ b/js/src/tests/non262/Iterator/from/return-iterator-if-iterable.js
@@ -0,0 +1,25 @@
+// |reftest| skip-if(!this.hasOwnProperty('Iterator')) -- Iterator is not enabled unconditionally
+/*---
+  Iterator.from returns O if it is iterable, an iterator, and an instance of Iterator.
+---*/
+
+class TestIterator extends Iterator {
+  [Symbol.iterator]() {
+    return this;
+  }
+
+  next() {
+    return { done: false, value: this.value++ };
+  }
+
+  value = 0;
+}
+
+const iter = new TestIterator();
+assertEq(iter, Iterator.from(iter));
+
+const arrayIter = [1, 2, 3][Symbol.iterator]();
+assertEq(arrayIter, Iterator.from(arrayIter));
+
+if (typeof reportCompare === 'function')
+  reportCompare(0, 0);