1 files changed, 59 insertions, 0 deletions
diff --git a/js/src/tests/test262/intl402/DisplayNames/options-fallback-invalid-throws.js b/js/src/tests/test262/intl402/DisplayNames/options-fallback-invalid-throws.js
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index 0000000000..c1d6c5ae21
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+++ b/js/src/tests/test262/intl402/DisplayNames/options-fallback-invalid-throws.js
@@ -0,0 +1,59 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-Intl.DisplayNames
+description: >
+  Return abrupt completion from an invalid fallback option
+info: |
+  Intl.DisplayNames ( locales , options )
+
+  1. If NewTarget is undefined, throw a TypeError exception.
+  2. Let displayNames be ? OrdinaryCreateFromConstructor(NewTarget, "%DisplayNamesPrototype%",
+    « [[InitializedDisplayNames]], [[Locale]], [[Style]], [[Type]], [[Fallback]], [[Fields]] »).
+  ...
+  4. Let options be ? ToObject(options).
+  ...
+  8. Let matcher be ? GetOption(options, "localeMatcher", "string", « "lookup", "best fit" », "best fit").
+  ...
+  12. Let type be ? GetOption(options, "type", "string", « "language", "region", "script", "currency" », "language").
+  13. If type is undefined, throw a TypeError exception.
+  ...
+  15. Let fallback be ? GetOption(options, "fallback", "string", « "code", "none" », "code").
+  ...
+
+  GetOption ( options, property, type, values, fallback )
+
+  1. Let value be ? Get(options, property).
+  2. If value is not undefined, then
+    ...
+    c. If type is "string", then
+      i. Let value be ? ToString(value).
+    d. If values is not undefined, then
+      i. If values does not contain an element equal to value, throw a RangeError exception.
+  ...
+features: [Intl.DisplayNames]
+locale: [en]
+---*/
+
+assert.throws(RangeError, () => {
+  new Intl.DisplayNames('en', {fallback: 'err', type: 'language'});
+}, 'err');
+
+assert.throws(RangeError, () => {
+  new Intl.DisplayNames('en', {fallback: 'non', type: 'language'});
+}, 'non, not none');
+
+assert.throws(RangeError, () => {
+  new Intl.DisplayNames('en', {fallback: null, type: 'language'});
+}, 'null');
+
+assert.throws(RangeError, () => {
+  new Intl.DisplayNames('en', {fallback: '', type: 'language'});
+}, 'the empty string');
+
+assert.throws(RangeError, () => {
+  new Intl.DisplayNames('en', {fallback: ['code', 'none'], type: 'language'});
+}, 'an array with the valid options is not necessarily valid');
+
+reportCompare(0, 0);