// 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');