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-rw-r--r--js/src/jit-test/tests/collections/Set-iterator-add-remove.js13
1 files changed, 13 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/collections/Set-iterator-add-remove.js b/js/src/jit-test/tests/collections/Set-iterator-add-remove.js
new file mode 100644
index 000000000..b0d3518da
--- /dev/null
+++ b/js/src/jit-test/tests/collections/Set-iterator-add-remove.js
@@ -0,0 +1,13 @@
+// Removing and re-adding entries while an iterator is live causes the iterator to visit them again.
+
+var set = new Set(['a']);
+var n = 5;
+for (let v of set) {
+ assertEq(v, 'a');
+ if (n === 0)
+ break;
+ set.delete('a');
+ set.add('a');
+ n--;
+}
+assertEq(n, 0);