File: PluralsTest.php

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<?php
/*
   Copyright (c) 2020 Sunil Mohan Adapa <sunil at medhas dot org>

   Drop in replacement for native gettext.

   This file is part of PHP-gettext.

   PHP-gettext is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   PHP-gettext is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with PHP-gettext; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/

/*
Unicode plural data for various languages is under the Unicode License
Agreement taken from:
https://unicode-org.github.io/cldr-staging/charts/37/supplemental/language_plural_rules.html

UNICODE, INC. LICENSE AGREEMENT - DATA FILES AND SOFTWARE

See Terms of Use for definitions of Unicode Inc.'s Data Files and Software.

NOTICE TO USER: Carefully read the following legal agreement. BY DOWNLOADING,
INSTALLING, COPYING OR OTHERWISE USING UNICODE INC.'S DATA FILES ("DATA
FILES"), AND/OR SOFTWARE ("SOFTWARE"), YOU UNEQUIVOCALLY ACCEPT, AND AGREE TO
BE BOUND BY, ALL OF THE TERMS AND CONDITIONS OF THIS AGREEMENT. IF YOU DO NOT
AGREE, DO NOT DOWNLOAD, INSTALL, COPY, DISTRIBUTE OR USE THE DATA FILES OR
SOFTWARE.

COPYRIGHT AND PERMISSION NOTICE

Copyright © 1991-2020 Unicode, Inc. All rights reserved. Distributed under the
Terms of Use in https://www.unicode.org/copyright.html.

Permission is hereby granted, free of charge, to any person obtaining a copy
of the Unicode data files and any associated documentation (the "Data Files")
or Unicode software and any associated documentation (the "Software") to deal
in the Data Files or Software without restriction, including without
limitation the rights to use, copy, modify, merge, publish, distribute, and/or
sell copies of the Data Files or Software, and to permit persons to whom the
Data Files or Software are furnished to do so, provided that either (a) this
copyright and permission notice appear with all copies of the Data Files or
Software, or (b) this copyright and permission notice appear in associated
Documentation.

THE DATA FILES AND SOFTWARE ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD
PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN
THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL
DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THE
DATA FILES OR SOFTWARE.

Except as contained in this notice, the name of a copyright holder shall not
be used in advertising or otherwise to promote the sale, use or other dealings
in these Data Files or Software without prior written authorization of the
copyright holder.
*/

use PHPUnit\Framework\TestCase;
require_once('plurals.php');

class PluralsTest extends TestCase {
  public static function evaluations_provider() {
    return [
      // Simple expressions
      ["1", [0 => 1, 1 => 1, 2 => 1]],
      ["n", [0 => 0, 1 => 1, 2 => 2]],
      ["!n", [0 => 1, 1 => 0, 2 => 0]],
      ["n == 1", [0 => 0, 1 => 1, 2 => 0]],
      ["n != 1", [0 => 1, 1 => 0, 2 => 1]],
      ["n > 1", [0 => 0, 1 => 0, 2 => 1]],
      ["n < 1", [0 => 1, 1 => 0, 2 => 0]],
      ["n >= 1", [0 => 0, 1 => 1, 2 => 1]],
      ["n <= 1", [0 => 1, 1 => 1, 2 => 0]],
      ["n && 1", [0 => 0, 1 => 1]],
      ["n && 0", [0 => 0, 1 => 0]],
      ["n || 1", [0 => 1, 1 => 1]],
      ["n || 0", [0 => 0, 1 => 1]],
      ["n + 1", [0 => 1, 1 => 2, 2 => 3]],
      ["n - 1", [0 => -1, 1 => 0, 2 => 1]],
      ["n * 2", [0 => 0, 1 => 2, 2 => 4]],
      ["n / 2", [0 => 0, 1 => 0, 2 => 1]],
      ["n % 3", [0 => 0, 1 => 1, 2 => 2, 3 => 0, 4 => 1]],
      ["n ? 1 : 2", [0 => 2, 1 => 1]],
      ["n == 1 ? 0 : n == 2 ? 1 : 2", [0 => 2, 1 => 0, 2 => 1, 3 => 2]],
      // Bambara, Burmese, Cantonese, Chinese, Dzongkha, Igbo, Indonesian,
      // Japanese, Javanese, Kabuverdianu, Khmer, Korean, Koyraboro Senni,
      // Lakota, Lao, Lojban, Makonde, Malay, N’Ko, Osage, Root, Sakha, Sango,
      // Sichuan Yi, Sundanese, Thai, Tibetan, Tongan, Vietnamese, Wolof,
      // Yoruba
      ["0", [0 => 0, 1 => 0, 2 => 0]],
      // Cebuano, Filipino, Tagalog
      ["(n % 10 == 4) || (n % 10 == 6) || (n % 10 == 9) ? 1 : 0",
       [0 => 0, 1 => 0, 2 => 0, 3 => 0, 5 => 0, 7 => 0, 8 => 0, 10 => 0,
        11 => 0, 12 => 0, 13 => 0, 15 => 0, 17 => 0, 18 => 0, 20 => 0, 21 => 0,
        100 => 0, 1000 => 0, 10000 => 0, 100000 => 0, 1000000 => 0, 4 => 1,
        6 => 1, 9 => 1, 14 => 1, 16 => 1, 19 => 1, 24 => 1, 26 => 1, 104 => 1,
        1004 => 1]],
      // Central Atlas Tamazight
      ["((n == 0) || (n == 1) || (n >= 11 && n <= 99)) ? 0 : 1",
       [0 => 0, 1 => 0, 11 => 0, 12 => 0, 98 => 0, 99 => 0, 2 => 1, 3 => 1,
        8 => 1, 9 => 1, 100 => 1, 101 => 1, 102 => 1, 111 => 1, 199 => 1]],
      // Icelandic, Macedonian
      ["(n % 10 == 1) && (n % 100 != 11) ? 0 : 1",
       [1 => 0, 21 => 0, 31 => 0, 101 => 0, 121 => 0, 1001 => 0, 0 => 1,
        2 => 1, 10 => 1, 11 => 1, 111 => 1, 1000 => 1, 1011 => 1]],
      // Akan, Amharic, Armenian, Assamese, Bangla, Bhojpuri, French, Fulah,
      // Gujarati, Gun, Hindi, Kabyle, Kannada, Lingala, Malagasy, Nigerian
      // Pidgin, Northern Sotho, Persian, Portuguese, Punjabi, Sinhala,
      // Tigrinya, Walloon, Zulu
      ["(n == 0) || (n == 1) ? 0 : 1",
       [0 => 0, 1 => 0, 2 => 1, 3 => 1, 10 => 1, 100 => 1, 1000 => 1]],
      // Afrikaans, Albanian, Aragonese, Asturian, Asu, Azerbaijani, Basque,
      // Bemba, Bena, Bodo, Bulgarian, Catalan, Central Kurdish, Chechen,
      // Cherokee, Chiga, Danish, Divehi, Dutch, English, Esperanto, Estonian,
      // European Portuguese, Ewe, Faroese, Finnish, Friulian, Galician,
      // Ganda, Georgian, German, Greek, Hausa, Hawaiian, Hungarian, Ido,
      // Interlingua, Italian, Jju, Kako, Kalaallisut, Kashmiri, Kazakh,
      // Kurdish, Kyrgyz, Luxembourgish, Machame, Malayalam, Marathi, Masai,
      // Metaʼ, Mongolian, Nahuatl, Nepali, Ngiemboon, Ngomba, North Ndebele,
      // Norwegian, Norwegian Bokmål, Norwegian Nynorsk, Nyanja, Nyankole,
      // Odia, Oromo, Ossetic, Papiamento, Pashto, Romansh, Rombo, Rwa, Saho,
      // Samburu, Sardinian, Sena, Shambala, Shona, Sicilian, Sindhi, Soga,
      // Somali, South Ndebele, Southern Kurdish, Southern Sotho, Spanish,
      // Swahili, Swati, Swedish, Swiss German, Syriac, Tamil, Telugu, Teso,
      // Tigre, Tsonga, Tswana, Turkish, Turkmen, Tyap, Urdu, Uyghur, Uzbek,
      // Venda, Volapük, Vunjo, Walser, Western Frisian, Xhosa, Yiddish
      ["(n != 1)", [0 => 1, 2 => 1, 3 => 1, 10 => 1, 100 => 1, 1 => 0]],
      // Latvian, Prussian
      ["n%10==1 && n%100!=11 ? 1 : (n % 10 == 0 || (n % 100 >= 11 && n % 100 <= 19)) ? 0 : 2",
       [0 => 0, 10 => 0, 11 => 0, 12 => 0, 19 => 0, 20 => 0, 30 => 0,
        100 => 0, 110 => 0, 111 => 0, 119 => 0, 120 => 0, 1 => 1, 21 => 1,
        31 => 1, 101 => 1, 121 => 1, 2 => 2, 3 => 2, 22 => 2, 29 => 2,
        102 => 2, 109 => 2, 122 => 2]],
      // Colognian, Langi
      ["n == 0 ? 0 : n == 1 ? 1 : 2",
       [0 => 0, 1 => 1, 2 => 2, 3 => 2, 10 => 2, 100 => 2, 1000 => 2]],
      // Inari Sami, Inuktitut, Lule Sami, Nama, Northern Sami, Sami languages
      // [Other]], Santali, Skolt Sami, Southern Sami
      ["(n == 1) ? 0 : (n == 2) ? 1 : 2",
       [0 => 2, 1 => 0, 2 => 1, 3 => 2, 100 => 2, 1000 => 2]],
      // Belarusian, Russian, Ukrainian
      ["n%10==1 && n%100!=11 ? 0 : n%10>=2 && n%10<=4 && (n%100<10 || n%100>=20) ? 1 : 2",
       [1 => 0, 21 => 0, 31 => 0, 41 => 0, 101 => 0, 1001 => 0, 2 => 1,
        3 => 1, 4 => 1, 22 => 1, 24 => 1, 32 => 1, 102 => 1, 1002 => 1, 0 => 2,
        5 => 2, 11 => 2, 12 => 2, 13 => 2, 14 => 2, 15 => 2, 20 => 2, 25 => 2,
        100 => 2, 111 => 2, 1000 => 2]],
      // Polish
      ["n == 1 ? 0 : (n % 10 >= 2) && (n % 10 <= 4) && ((n % 100 < 12) || (n % 100 > 14)) ? 1 : 2",
       [1 => 0, 2 => 1, 3 => 1, 4 => 1, 22 => 1, 23 => 1, 24 => 1, 32 => 1,
        33 => 1, 34 => 1, 102 => 1, 103 => 1, 104 => 1, 122 => 1, 123 => 1,
        124 => 1, 5 => 2, 6 => 2, 11 => 2, 12 => 2, 13 => 2, 20 => 2, 21 => 2,
        30 => 2, 31 => 2, 100 => 2, 101 => 2, 105 => 2, 111 => 2, 112 => 2,
        113 => 2, 121 => 2]],
      // Lithuanian
      ["(n % 10 == 1) && (n % 100 != 11) ? 0 : ((n % 10 >= 2) && (n % 10 <= 9) && ((n % 100 < 11) || (n % 100 > 19))) ? 1 : 2",
       [1 => 0, 21 => 0, 31 => 0, 91 => 0, 101 => 0, 121 => 0, 2 => 1, 3 => 1,
        9 => 1, 22 => 1, 23 => 1, 29 => 1, 102 => 1, 103 => 1, 109 => 1,
        122 => 1, 129 => 1, 0 => 2, 10 => 2, 11 => 2, 19 => 2, 20 => 2,
        30 => 2, 40 => 2, 110 => 2, 111 => 2, 119 => 2, 120 => 2]],
      // Bosnian, Croatian, Serbian, Serbo-Croatian
      ["(n % 10 == 1) && (n % 100 != 11) ? 0 : (n % 10 >= 2) && (n % 10 <= 4) && ((n % 100 < 12) || (n % 100 > 14)) ? 1 : 2",
       [1 => 0, 21 => 0, 31 => 0, 91 => 0, 101 => 0, 121 => 0, 2 => 1, 3 => 1,
        4 => 1, 22 => 1, 23 => 1, 24 => 1, 102 => 1, 103 => 1, 104 => 1,
        122 => 1, 124 => 1, 5 => 2, 6 => 2, 10 => 2, 11 => 2, 12 => 2, 13 => 2,
        14 => 2, 20 => 2, 25 => 2, 30 => 2, 100 => 2, 105 => 2, 110 => 2,
        111 => 2, 112 => 2, 113 => 2, 114 => 2, 120 => 2, 125 => 2, 130 => 2]],
      // Tachelhit
      ["n <= 1 ? 0 : (n >= 2 && n <= 10) ? 1 : 2",
       [0 => 0, 1 => 0, 2 => 1, 3 => 1, 4 => 1, 9 => 1, 10 => 1, 11 => 2,
        12 => 2, 99 => 2, 100 => 2, 101 => 2, 102 => 2, 110 => 2]],
      // Moldavian, Romanian
      ["(n == 1 ? 0 : ((n == 0) || ((n % 100 >=2) && (n % 100 <= 19))) ? 1 : 2)",
       [1 => 0, 0 => 1, 2 => 1, 3 => 1, 10 => 1, 11 => 1, 19 => 1, 102 => 1,
        119 => 1, 20 => 2, 21 => 2, 100 => 2, 101 => 2, 120 => 2, 121 => 2]],
      // Czech, Slovak
      ["n == 1 ? 0 : (n >= 2) && (n <= 4) ? 1 : 2",
       [1 => 0, 2 => 1, 3 => 1, 4 => 1, 0 => 2, 5 => 2, 10 => 2, 11 => 2,
        100 => 2]],
      // Manx
      ["n % 10 == 1 ? 0 : n % 10 == 2 ? 1 : n % 20 == 0 ? 2 : 3",
       [1 => 0, 11 => 0, 21 => 0, 31 => 0, 2 => 1, 12 => 1, 22 => 1, 32 => 1,
        0 => 2, 20 => 2, 40 => 2, 60 => 2, 3 => 3, 10 => 3, 13 => 3, 19 => 3,
        23 => 3, 30 => 3]],
      // Scottish Gaelic
      ["(n == 1) || (n == 11) ? 0 : (n == 2) || (n == 12) ? 1 : (n >= 3) && (n <= 19) ? 2 : 3",
       [1 => 0, 11 => 0, 2 => 1, 12 => 1, 3 => 2, 4 => 2, 9 => 2, 10 => 2,
        13 => 2, 14 => 2, 19 => 2, 0 => 3, 20 => 3, 21 => 3, 100 => 3,
        101 => 3, 102 => 3, 111 => 3]],
      // Breton
      ["(n % 10 == 1) && (n % 100 != 11) && (n % 100 != 71) && (n % 100 != 91) ? 0 : (n % 10 == 2) && (n % 100 != 12) && (n % 100 != 72) && (n % 100 != 92) ? 1 : ((n % 10 == 3) || (n % 10 == 4) || (n % 10 == 9)) && ((n % 100 < 10) || (n % 100 > 19)) && ((n % 100 < 70) || (n % 100 > 79)) && ((n % 100 < 90) || (n % 100 > 99)) ? 2 : (n != 0) && (n % 1000000 == 0) ? 3 : 4",
       [1 => 0, 21 => 0, 31 => 0, 61 => 0, 81 => 0, 101 => 0, 121 => 0,
        2 => 1, 22 => 1, 32 => 1, 62 => 1, 82 => 1, 102 => 1, 122 => 1, 3 => 2,
        4 => 2, 9 => 2, 23 => 2, 24 => 2, 29 => 2, 63 => 2, 64 => 2, 69 => 2,
        83 => 2, 84 => 2, 89 => 2, 103 => 2, 104 => 2, 109 => 2, 123 => 2,
        124 => 2, 129 => 2, 1000000 => 3, 2000000 => 3, 0 => 4, 5 => 4, 8 => 4,
        10 => 4, 11 => 4, 12 => 4, 13 => 4, 14 => 4, 19 => 4, 20 => 4, 25 => 4,
        28 => 4, 30 => 4, 71 => 4, 72 => 4, 73 => 4, 74 => 4, 79 => 4, 80 => 4,
        105 => 4, 108 => 4, 110 => 4, 111 => 4, 112 => 4, 113 => 4, 114 => 4,
        119 => 4]],
      // Lower Sorbian, Slovenian, Upper Sorbian
      ["n % 100 == 1 ? 0 : n % 100 == 2 ? 1 : (n % 100 == 3) || (n % 100 == 4) ? 2 : 3",
       [1 => 0, 101 => 0, 201 => 0, 2 => 1, 102 => 1, 202 => 1, 3 => 2,
        4 => 2, 103 => 2, 104 => 2, 203 => 2, 204 => 2, 0 => 3, 5 => 3,
        100 => 3, 105 => 3, 200 => 3, 205 => 3]],
      // Hebrew
      ["n == 1 ? 0 : n == 2 ? 1 : (n % 10 == 0) && (n > 10) ? 2 : 3",
       [1 => 0, 2 => 1, 20 => 2, 30 => 2, 40 => 2, 50 => 2, 100 => 2,
        0 => 3, 3 => 3, 4 => 3, 10 => 3, 11 => 3, 19 => 3, 21 => 3, 29 => 3,
        101 => 3, 102 => 3, 109 => 3, 111 => 3, 119 => 3]],
      // Maltese
      ["n == 1 ? 0 : (n == 0) || ((n % 100 >= 2) && (n % 100 <= 10)) ? 1 : (n % 100 >= 11) && (n % 100 <= 19) ? 2 : 3 ",
       [1 => 0, 0 => 1, 2 => 1, 3 => 1, 9 => 1, 10 => 1, 102 => 1, 103 => 1,
        110 => 1, 11 => 2, 12 => 2, 18 => 2, 19 => 2, 111 => 2, 119 => 2,
        20 => 3, 21 => 3, 100 => 3, 101 => 3, 120 => 3, 121 => 3]],
      // Irish
      ["n == 1 ? 0 : n == 2 ? 1 : (n >= 3) && (n <= 6) ? 2 : (n >= 7) && (n <= 10) ? 3 : 4",
       [1 => 0, 2 => 1, 3 => 2, 4 => 2, 5 => 2, 6 => 2, 7 => 3, 8 => 3,
        9 => 3, 10 => 3, 0 => 4, 11 => 4, 12 => 4, 100 => 4, 101 => 4,
        102 => 4, 110 => 4]],
      // Arabic, Najdi Arabic
      ["n == 0 ? 0 : n == 1 ? 1 : n == 2 ? 2 : (n % 100 >=3) && (n % 100 <= 10) ? 3 : (n % 100 >= 3) ? 4 : 5",
       [0 => 0, 1 => 1, 2 => 2, 3 => 3, 4 => 3, 9 => 3, 10 => 3, 103 => 3,
        104 => 3, 109 => 3, 110 => 3, 11 => 4, 12 => 4, 13 => 4, 98 => 4,
        99 => 4, 111 => 4, 112 => 4, 113 => 4, 100 => 5, 101 => 5, 102 => 5,
        200 => 5]],
      // Welsh
      ["n == 0 ? 0 : n == 1 ? 1 : n == 2 ? 2 : n == 3 ? 3 : n == 6 ? 4 : 5",
       [0 => 0, 1 => 1, 2 => 2, 3 => 3, 6 => 4, 4 => 5, 5 => 5, 7 => 5,
        10 => 5, 100 => 5]],
      // Cornish
      ["n == 0 ? 0 : n == 1 ? 1 : (n % 20 == 2) ? 2 : (n % 20 == 3) ? 3 : (n % 20 == 1) ? 4 : 5",
       [0 => 0, 1 => 1, 2 => 2, 22 => 2, 42 => 2, 102 => 2, 3 => 3, 23 => 3,
        43 => 3, 103 => 3, 21 => 4, 41 => 4, 101 => 4, 4 => 5, 10 => 5,
        11 => 5, 12 => 5, 13 => 5, 20 => 5, 24 => 5, 40 => 5, 104 => 5,
        120 => 5]]
    ];
  }

  /**
   * @dataProvider evaluations_provider
   */
  public function test_evaluations($expression_string, $value_tests) {
    $parser = new PluralsParser($expression_string);
    $expression = $parser->parse();
    foreach ($value_tests as $input => $expected_output) {
      $output = $expression->evaluate($input);
      $this->assertEquals($output, $expected_output);
    }
  }

  public static function expressions_provider() {
    return [
      ['1 + !n', '(1 + (! n))'],
      ['1 + 2 + 3 + 4 + 500', '((((1 + 2) + 3) + 4) + 500)'],
      ['1 + (2 + (3 + 4))', '(1 + (2 + (3 + 4)))'],
      ['1 || 2 && 3', '(1 || (2 && 3))'],
      ['1 == 2 != 3', '((1 == 2) != 3)'],
      ['1 <= 2 + 3', '(1 <= (2 + 3))'],
      ['1 - 2 % 3', '(1 - (2 % 3))'],
      ['1 - !2 % 3', '(1 - ((! 2) % 3))'],
      ['1 + 2 * 3 / 1', '(1 + ((2 * 3) / 1))'],
      ['1 + 2 * 3 + 1', '((1 + (2 * 3)) + 1)'],
      ['n%10==1 && n%100!=11', '(((n % 10) == 1) && ((n % 100) != 11))'],
      ['n ? 1 + 2 : 3 * 4', '(n ? (1 + 2) : (3 * 4))'],
      ['n == 1 ? n < 10 ? 1 * 1 : 1 * 2 : 1 * 3',
        '((n == 1) ? ((n < 10) ? (1 * 1) : (1 * 2)) : (1 * 3))'],
    ];
  }

  /**
   * @dataProvider expressions_provider
   */
  public function test_expressions($expression_string, $expected_output) {
    $parser = new PluralsParser($expression_string);
    $expression = $parser->parse();
    $output = $expression->to_string();
    $this->assertEquals($output, $expected_output);
  }

  public static function syntax_provider() {
    return [
      ["(0", 'Mismatched parenthesis'],
      ["(((0) + 1)", 'Mismatched parenthesis'],
      ["(((0) + 1) + 2", 'Mismatched parenthesis'],
      ["0) + 1", 'Could not parse completely'],
      ["a", 'Lexical analysis failed'],
      ["a ? 1 : 0", 'Lexical analysis failed'],
      ["1 + ", 'Primary expected'],
      ["1 + +", 'Primary expected'],
      ["1 + ! +", 'Primary expected'],
      ["1 ? 2 :", 'Primary expected'],
      ["1 ( 2", 'Operator expected'],
      ["1 n", 'Operator expected'],
      ["1 ? 2", 'Invalid ? expression'],
    ];
  }

  /**
   * @dataProvider syntax_provider
   */
  function test_syntax($expression_string, $expected_output) {
    $this->expectExceptionMessage($expected_output);
    $parser = new PluralsParser($expression_string);
    $parser->parse();
  }

  static function header_provider() {
    return [
        // Valid
        ["nplurals=1; plural=0;", 1, "0"],
        ["  nplurals  =  1  ;  plural  =  0  ;  ", 1, "0"],
        ["nplurals=4; plural=(n == 1) || (n == 11) ? 0 : (n == 2) || (n == 12) ? 1 : (n >= 3) && (n <= 19) ? 2 : 3;",
         4,
         "(((n == 1) || (n == 11)) ? 0 : (((n == 2) || (n == 12)) ? 1 : (((n >= 3) && (n <= 19)) ? 2 : 3)))"],
        // Invalid
        ["badvalue", 2, "((n == 1) ? 0 : 1)"],
        ["badvalue=1", 2, "((n == 1) ? 0 : 1)"],
        ["nplurals=n", 2, "((n == 1) ? 0 : 1)"],
        ["nplurals=1;", 2, "((n == 1) ? 0 : 1)"],
        ["nplurals=1 plural=0", 2, "((n == 1) ? 0 : 1)"],
        ["nplurals=1; badvalue;", 2, "((n == 1) ? 0 : 1)"],
        ["nplurals=1; badvalue=0;", 2, "((n == 1) ? 0 : 1)"],
        ["nplurals=1; plural=0", 2, "((n == 1) ? 0 : 1)"],
        ["badvalue=1; plural=badvalue;", 2, "((n == 1) ? 0 : 1)"],
        ["nplurals=1; plural=exit();", 2, "((n == 1) ? 0 : 1)"],
    ];
  }

  /**
   * @dataProvider header_provider
   */
  function test_header($header_value, $expected_total, $expected_expression) {
    $header = new PluralHeader($header_value);
    $this->assertEquals($header->total, $expected_total);
    $this->assertEquals($header->expression->to_string(), $expected_expression);
  }
}