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diff --git a/test/language/expressions/optional-chaining/short-circuiting.js b/test/language/expressions/optional-chaining/short-circuiting.js
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+// Copyright 2019 Google, Inc.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: prod-OptionalExpression
+description: >
+  demonstrate syntax-based short-circuiting.
+info: |
+  If the expression on the LHS of ?. evaluates to null/undefined, the RHS is
+  not evaluated
+features: [optional-chaining]
+---*/
+
+const a = undefined;
+let x = 1;
+
+a?.[++x] // short-circuiting.
+a?.b.c(++x).d; // long short-circuiting.
+
+undefined?.[++x] // short-circuiting.
+undefined?.b.c(++x).d; // long short-circuiting.
+
+assert.sameValue(1, x);