1 files changed, 22 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/String/prototype/at/index-non-numeric-argument-tointeger-invalid.js b/js/src/tests/test262/built-ins/String/prototype/at/index-non-numeric-argument-tointeger-invalid.js
new file mode 100644
index 0000000000..64a31c0120
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/at/index-non-numeric-argument-tointeger-invalid.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.at
+description: >
+  Property type and descriptor.
+info: |
+  String.prototype.at( index )
+
+  Let relativeIndex be ? ToInteger(index).
+
+features: [String.prototype.at]
+---*/
+assert.sameValue(typeof String.prototype.at, 'function');
+
+let s = "01";
+
+assert.throws(TypeError, () => {
+  s.at(Symbol());
+}, '`s.at(Symbol())` throws TypeError');
+
+reportCompare(0, 0);