1 files changed, 45 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/optional-chaining/iteration-statement-for.js b/js/src/tests/test262/language/optional-chaining/iteration-statement-for.js
new file mode 100644
index 0000000000..cb884d486e
--- /dev/null
+++ b/js/src/tests/test262/language/optional-chaining/iteration-statement-for.js
@@ -0,0 +1,45 @@
+// Copyright 2019 Google, LLC.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: prod-OptionalExpression
+description: >
+  optional chain in init/test/update of for statement
+info: |
+  IterationStatement
+    for (Expression; Expression; Expression) Statement
+features: [optional-chaining]
+---*/
+
+// OptionalExpression in test.
+let count;
+const obj = {a: true};
+for (count = 0; obj?.a; count++) {
+  if (count > 0) break;
+}
+assert.sameValue(count, 1);
+
+// OptionalExpression in init/test/update.
+let count2 = 0;
+const obj2 = undefined;
+
+for (obj?.a; obj2?.a; obj?.a) { count2++; }
+assert.sameValue(count2, 0);
+
+for (obj?.a; undefined?.a; obj?.a) { count2++; }
+assert.sameValue(count2, 0);
+
+// Short-circuiting
+let touched = 0;
+const obj3 = {
+  get a() {
+    count++;
+    return undefined; // explicit for clarity
+  }
+};
+for (count = 0; true; obj3?.a?.[touched++]) {
+  if (count > 0) { break; }
+}
+assert.sameValue(count, 1);
+assert.sameValue(touched, 0);
+
+reportCompare(0, 0);