1 files changed, 26 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/expressions/optional-chaining/optional-chain-async-square-brackets.js b/js/src/tests/test262/language/expressions/optional-chaining/optional-chain-async-square-brackets.js
new file mode 100644
index 0000000000..361b324295
--- /dev/null
+++ b/js/src/tests/test262/language/expressions/optional-chaining/optional-chain-async-square-brackets.js
@@ -0,0 +1,26 @@
+// |reftest| async
+// Copyright 2019 Google, Inc.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: prod-OptionalExpression
+description: >
+  optional chain expansions in an async context
+info: |
+  Left-Hand-Side Expressions
+    OptionalExpression
+      MemberExpression [PrimaryExpression Identifier] OptionalChain
+        OptionalChain ?.[Expression]
+features: [optional-chaining]
+flags: [async]
+includes: [asyncHelpers.js]
+---*/
+
+async function checkAssertions() {
+  assert.sameValue(await [11]?.[0], 11);
+  assert.sameValue([22, 33]?.[await Promise.resolve(1)], 33);
+  assert.sameValue([44, await Promise.resolve(55)]?.[1], 55);
+  assert.sameValue(undefined?.[
+    await Promise.reject(new Error('unreachable'))
+  ], undefined);
+}
+asyncTest(checkAssertions);