fixup! Add tests for "Intl NumberFormat v3" proposal

test/intl402/NumberFormat/constructor-options-roundingMode-invalid.js

@@ -0,0 +1,33 @@
+// Copyright 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-initializenumberformat
+description: Abrupt completion from invalid values for `roundingMode`
+features: [Intl.NumberFormat-v3]
+---*/
+
+assert.throws(RangeError, function() {
+  new Intl.NumberFormat('en', {roundingMode: null});
+}, 'null');
+
+assert.throws(RangeError, function() {
+  new Intl.NumberFormat('en', {roundingMode: 3});
+}, 'number');
+
+assert.throws(RangeError, function() {
+  new Intl.NumberFormat('en', {roundingMode: true});
+}, 'boolean');
+
+assert.throws(RangeError, function() {
+  new Intl.NumberFormat('en', {roundingMode: 'HalfExpand'});
+}, 'invalid string');
+
+var symbol = Symbol('halfExpand');
+assert.throws(TypeError, function() {
+  new Intl.NumberFormat('en', {roundingMode: symbol});
+}, 'Symbol');
+
+var brokenToString = { toString: function() { throw new Test262Error(); } };
+assert.throws(Test262Error, function() {
+  new Intl.NumberFormat('en', {roundingMode: brokenToString});
+}, 'broken `toString` implementation');