Test non-property key throws

test/built-ins/Array/prototype/group/invalid-property-key.js

@@ -0,0 +1,28 @@
+// Copyright (c) 2021 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-array.prototype.group
+description: Array.prototype.group errors when return value cannot be converted to a property key.
+info: |
+  22.1.3.14 Array.prototype.group ( callbackfn [ , thisArg ] )
+
+  ...
+
+  6. Repeat, while k < len
+    c. Let propertyKey be ? ToPropertyKey(? Call(callbackfn, thisArg, « kValue, 𝔽(k), O »)).
+
+  ...
+features: [array-grouping]
+---*/
+
+assert.throws(Test262Error, function() {
+  const array = [1];
+  array.group(function() {
+    return {
+      toString() {
+        throw new Test262Error('not a property key');
+      }
+    };
+  })
+});