Add optional chaining testssnapshot-20180312-3c69133-based

Change-Id: Ia87313a2756dfbc3d90128ac77cd4dc6c8c137df
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
(cherry picked from commit 7d1cf05c547a636495b2731c4fc2842a01849064)
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

1 files changed, 20 insertions, 0 deletions

diff --git a/test/language/expressions/optional-chaining/member-expression-async-this.js b/test/language/expressions/optional-chaining/member-expression-async-this.js
new file mode 100644
index 000000000..988729a78
--- /dev/null
+++ b/test/language/expressions/optional-chaining/member-expression-async-this.js
@@ -0,0 +1,20 @@
+// 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 on member expression in async context
+info: |
+  Left-Hand-Side Expressions
+    OptionalExpression:
+      MemberExpression [PrimaryExpression this] OptionalChain
+features: [optional-chaining]
+flags: [async]
+---*/
+
+async function thisFn() {
+  return await this?.a
+}
+thisFn.call({a: Promise.resolve(33)}).then(function(arg) {
+  assert.sameValue(33, arg);
+}).then($DONE, $DONE);