text: // 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');
  