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/core/modules/system/src/Tests/Mail/HtmlToTextTest.php

http://github.com/drupal/drupal
PHP | 387 lines | 263 code | 20 blank | 104 comment | 3 complexity | cfd46e52104a6ee12c09a36c6eee3f86 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.1 
    

  1. <?php
    2. 

  2. 

  3. namespace Drupal\system\Tests\Mail;
    4. 

  4. 

  5. use Drupal\Component\Utility\Html;
    6. 

  6. use Drupal\Component\Utility\Unicode;
    7. 

  7. use Drupal\Core\Mail\MailFormatHelper;
    8. 

  8. use Drupal\Core\Site\Settings;
    9. 

  9. use Drupal\simpletest\WebTestBase;
    10. 

  10. 

  11. /**
    12. 

  12.  * Tests for \Drupal\Core\Mail\MailFormatHelper::htmlToText().
    13. 

  13.  *
    14. 

  14.  * @group Mail
    15. 

  15.  */
    16. 

  16. class HtmlToTextTest extends WebTestBase {
    17. 

  17.   /**
    18. 

  18.    * Converts a string to its PHP source equivalent for display in test messages.
    19. 

  19.    *
    20. 

  20.    * @param $text
    21. 

  21.    *   The text string to convert.
    22. 

  22.    *
    23. 

  23.    * @return
    24. 

  24.    *   An HTML representation of the text string that, when displayed in a
    25. 

  25.    *   browser, represents the PHP source code equivalent of $text.
    26. 

  26.    */
    27. 

  27.   protected function stringToHtml($text) {
    28. 

  28.     return '"' .
    29. 

  29.       str_replace(
    30. 

  30.         array("\n", ' '),
    31. 

  31.         array('\n', '&nbsp;'),
    32. 

  32.         Html::escape($text)
    33. 

  33.       ) . '"';
    34. 

  34.   }
    35. 

  35. 

  36.   /**
    37. 

  37.    * Helper function to test \Drupal\Core\Mail\MailFormatHelper::htmlToText().
    38. 

  38.    *
    39. 

  39.    * @param $html
    40. 

  40.    *   The source HTML string to be converted.
    41. 

  41.    * @param $text
    42. 

  42.    *   The expected result of converting $html to text.
    43. 

  43.    * @param $message
    44. 

  44.    *   A text message to display in the assertion message.
    45. 

  45.    * @param $allowed_tags
    46. 

  46.    *   (optional) An array of allowed tags, or NULL to default to the full
    47. 

  47.    *   set of tags supported by
    48. 

  48.    *   \Drupal\Core\Mail\MailFormatHelper::htmlToText().
    49. 

  49.    */
    50. 

  50.   protected function assertHtmlToText($html, $text, $message, $allowed_tags = NULL) {
    51. 

  51.     preg_match_all('/<([a-z0-6]+)/', Unicode::strtolower($html), $matches);
    52. 

  52.     $tested_tags = implode(', ', array_unique($matches[1]));
    53. 

  53.     $message .= ' (' . $tested_tags . ')';
    54. 

  54.     $result = MailFormatHelper::htmlToText($html, $allowed_tags);
    55. 

  55.     $pass = $this->assertEqual($result, $text, Html::escape($message));
    56. 

  56.     $verbose = 'html = <pre>' . $this->stringToHtml($html)
    57. 

  57.       . '</pre><br />' . 'result = <pre>' . $this->stringToHtml($result)
    58. 

  58.       . '</pre><br />' . 'expected = <pre>' . $this->stringToHtml($text)
    59. 

  59.       . '</pre>';
    60. 

  60.     $this->verbose($verbose);
    61. 

  61.     if (!$pass) {
    62. 

  62.       $this->pass("Previous test verbose info:<br />$verbose");
    63. 

  63.     }
    64. 

  64.   }
    65. 

  65. 

  66.   /**
    67. 

  67.    * Test supported tags of \Drupal\Core\Mail\MailFormatHelper::htmlToText().
    68. 

  68.    */
    69. 

  69.   public function testTags() {
    70. 

  70.     global $base_path, $base_url;
    71. 

  71.     $tests = array(
    72. 

  72.       // @todo Trailing linefeeds should be trimmed.
    73. 

  73.       '<a href = "https://www.drupal.org">Drupal.org</a>' => "Drupal.org [1]\n\n[1] https://www.drupal.org\n",
    74. 

  74.       // @todo Footer URLs should be absolute.
    75. 

  75.       "<a href = \"$base_path\">Homepage</a>" => "Homepage [1]\n\n[1] $base_url/\n",
    76. 

  76.       '<address>Drupal</address>' => "Drupal\n",
    77. 

  77.       // @todo The <address> tag is currently not supported.
    78. 

  78.       '<address>Drupal</address><address>Drupal</address>' => "DrupalDrupal\n",
    79. 

  79.       '<b>Drupal</b>' => "*Drupal*\n",
    80. 

  80.       // @todo There should be a space between the '>' and the text.
    81. 

  81.       '<blockquote>Drupal</blockquote>' => ">Drupal\n",
    82. 

  82.       '<blockquote>Drupal</blockquote><blockquote>Drupal</blockquote>' => ">Drupal\n>Drupal\n",
    83. 

  83.       '<br />Drupal<br />Drupal<br /><br />Drupal' => "Drupal\nDrupal\nDrupal\n",
    84. 

  84.       '<br/>Drupal<br/>Drupal<br/><br/>Drupal' => "Drupal\nDrupal\nDrupal\n",
    85. 

  85.       // @todo There should be two line breaks before the paragraph.
    86. 

  86.       '<br/>Drupal<br/>Drupal<br/><br/>Drupal<p>Drupal</p>' => "Drupal\nDrupal\nDrupal\nDrupal\n\n",
    87. 

  87.       '<div>Drupal</div>' => "Drupal\n",
    88. 

  88.       // @todo The <div> tag is currently not supported.
    89. 

  89.       '<div>Drupal</div><div>Drupal</div>' => "DrupalDrupal\n",
    90. 

  90.       '<em>Drupal</em>' => "/Drupal/\n",
    91. 

  91.       '<h1>Drupal</h1>' => "======== DRUPAL ==============================================================\n\n",
    92. 

  92.       '<h1>Drupal</h1><p>Drupal</p>' => "======== DRUPAL ==============================================================\n\nDrupal\n\n",
    93. 

  93.       '<h2>Drupal</h2>' => "-------- DRUPAL --------------------------------------------------------------\n\n",
    94. 

  94.       '<h2>Drupal</h2><p>Drupal</p>' => "-------- DRUPAL --------------------------------------------------------------\n\nDrupal\n\n",
    95. 

  95.       '<h3>Drupal</h3>' => ".... Drupal\n\n",
    96. 

  96.       '<h3>Drupal</h3><p>Drupal</p>' => ".... Drupal\n\nDrupal\n\n",
    97. 

  97.       '<h4>Drupal</h4>' => ".. Drupal\n\n",
    98. 

  98.       '<h4>Drupal</h4><p>Drupal</p>' => ".. Drupal\n\nDrupal\n\n",
    99. 

  99.       '<h5>Drupal</h5>' => "Drupal\n\n",
    100. 

  100.       '<h5>Drupal</h5><p>Drupal</p>' => "Drupal\n\nDrupal\n\n",
    101. 

  101.       '<h6>Drupal</h6>' => "Drupal\n\n",
    102. 

  102.       '<h6>Drupal</h6><p>Drupal</p>' => "Drupal\n\nDrupal\n\n",
    103. 

  103.       '<hr />Drupal<hr />' => "------------------------------------------------------------------------------\nDrupal\n------------------------------------------------------------------------------\n",
    104. 

  104.       '<hr/>Drupal<hr/>' => "------------------------------------------------------------------------------\nDrupal\n------------------------------------------------------------------------------\n",
    105. 

  105.       '<hr/>Drupal<hr/><p>Drupal</p>' => "------------------------------------------------------------------------------\nDrupal\n------------------------------------------------------------------------------\nDrupal\n\n",
    106. 

  106.       '<i>Drupal</i>' => "/Drupal/\n",
    107. 

  107.       '<p>Drupal</p>' => "Drupal\n\n",
    108. 

  108.       '<p>Drupal</p><p>Drupal</p>' => "Drupal\n\nDrupal\n\n",
    109. 

  109.       '<strong>Drupal</strong>' => "*Drupal*\n",
    110. 

  110.       // @todo Tables are currently not supported.
    111. 

  111.       '<table><tr><td>Drupal</td><td>Drupal</td></tr><tr><td>Drupal</td><td>Drupal</td></tr></table>' => "DrupalDrupalDrupalDrupal\n",
    112. 

  112.       '<table><tr><td>Drupal</td></tr></table><p>Drupal</p>' => "Drupal\nDrupal\n\n",
    113. 

  113.       // @todo The <u> tag is currently not supported.
    114. 

  114.       '<u>Drupal</u>' => "Drupal\n",
    115. 

  115.       '<ul><li>Drupal</li></ul>' => " * Drupal\n\n",
    116. 

  116.       '<ul><li>Drupal <em>Drupal</em> Drupal</li></ul>' => " * Drupal /Drupal/ Drupal\n\n",
    117. 

  117.       // @todo Lines containing nothing but spaces should be trimmed.
    118. 

  118.       '<ul><li>Drupal</li><li><ol><li>Drupal</li><li>Drupal</li></ol></li></ul>' => " * Drupal\n *  1) Drupal\n    2) Drupal\n   \n\n",
    119. 

  119.       '<ul><li>Drupal</li><li><ol><li>Drupal</li></ol></li><li>Drupal</li></ul>' => " * Drupal\n *  1) Drupal\n   \n * Drupal\n\n",
    120. 

  120.       '<ul><li>Drupal</li><li>Drupal</li></ul>' => " * Drupal\n * Drupal\n\n",
    121. 

  121.       '<ul><li>Drupal</li></ul><p>Drupal</p>' => " * Drupal\n\nDrupal\n\n",
    122. 

  122.       '<ol><li>Drupal</li></ol>' => " 1) Drupal\n\n",
    123. 

  123.       '<ol><li>Drupal</li><li><ul><li>Drupal</li><li>Drupal</li></ul></li></ol>' => " 1) Drupal\n 2)  * Drupal\n     * Drupal\n    \n\n",
    124. 

  124.       '<ol><li>Drupal</li><li>Drupal</li></ol>' => " 1) Drupal\n 2) Drupal\n\n",
    125. 

  125.       '<ol>Drupal</ol>' => "Drupal\n\n",
    126. 

  126.       '<ol><li>Drupal</li></ol><p>Drupal</p>' => " 1) Drupal\n\nDrupal\n\n",
    127. 

  127.       '<dl><dt>Drupal</dt></dl>' => "Drupal\n\n",
    128. 

  128.       '<dl><dt>Drupal</dt><dd>Drupal</dd></dl>' => "Drupal\n    Drupal\n\n",
    129. 

  129.       '<dl><dt>Drupal</dt><dd>Drupal</dd><dt>Drupal</dt><dd>Drupal</dd></dl>' => "Drupal\n    Drupal\nDrupal\n    Drupal\n\n",
    130. 

  130.       '<dl><dt>Drupal</dt><dd>Drupal</dd></dl><p>Drupal</p>' => "Drupal\n    Drupal\n\nDrupal\n\n",
    131. 

  131.       '<dl><dt>Drupal<dd>Drupal</dl>' => "Drupal\n    Drupal\n\n",
    132. 

  132.       '<dl><dt>Drupal</dt></dl><p>Drupal</p>' => "Drupal\n\nDrupal\n\n",
    133. 

  133.       // @todo Again, lines containing only spaces should be trimmed.
    134. 

  134.       '<ul><li>Drupal</li><li><dl><dt>Drupal</dt><dd>Drupal</dd><dt>Drupal</dt><dd>Drupal</dd></dl></li><li>Drupal</li></ul>' => " * Drupal\n * Drupal\n       Drupal\n   Drupal\n       Drupal\n   \n * Drupal\n\n",
    135. 

  135.       // Tests malformed HTML tags.
    136. 

  136.       '<br>Drupal<br>Drupal' => "Drupal\nDrupal\n",
    137. 

  137.       '<hr>Drupal<hr>Drupal' => "------------------------------------------------------------------------------\nDrupal\n------------------------------------------------------------------------------\nDrupal\n",
    138. 

  138.       '<ol><li>Drupal<li>Drupal</ol>' => " 1) Drupal\n 2) Drupal\n\n",
    139. 

  139.       '<ul><li>Drupal <em>Drupal</em> Drupal</ul></ul>' => " * Drupal /Drupal/ Drupal\n\n",
    140. 

  140.       '<ul><li>Drupal<li>Drupal</ol>' => " * Drupal\n * Drupal\n\n",
    141. 

  141.       '<ul><li>Drupal<li>Drupal</ul>' => " * Drupal\n * Drupal\n\n",
    142. 

  142.       '<ul>Drupal</ul>' => "Drupal\n\n",
    143. 

  143.       'Drupal</ul></ol></dl><li>Drupal' => "Drupal\n * Drupal\n",
    144. 

  144.       '<dl>Drupal</dl>' => "Drupal\n\n",
    145. 

  145.       '<dl>Drupal</dl><p>Drupal</p>' => "Drupal\n\nDrupal\n\n",
    146. 

  146.       '<dt>Drupal</dt>' => "Drupal\n",
    147. 

  147.       // Tests some unsupported HTML tags.
    148. 

  148.       '<html>Drupal</html>' => "Drupal\n",
    149. 

  149.       // @todo Perhaps the contents of <script> tags should be dropped.
    150. 

  150.       '<script type="text/javascript">Drupal</script>' => "Drupal\n",
    151. 

  151.       // A couple of tests for Unicode characters.
    152. 

  152.       '<q>I <em>will</em> be back…</q>' => "I /will/ be back…\n",
    153. 

  153.       'FrançAIS is ÜBER-åwesome' => "FrançAIS is ÜBER-åwesome\n",
    154. 

  154.     );
    155. 

  155. 

  156.     foreach ($tests as $html => $text) {
    157. 

  157.       $this->assertHtmlToText($html, $text, 'Supported tags');
    158. 

  158.     }
    159. 

  159.   }
    160. 

  160. 

  161.   /**
    162. 

  162.    * Tests allowing tags in \Drupal\Core\Mail\MailFormatHelper::htmlToText().
    163. 

  163.    */
    164. 

  164.   public function testDrupalHtmlToTextArgs() {
    165. 

  165.     // The second parameter of \Drupal\Core\Mail\MailFormatHelper::htmlToText()
    166. 

  166.     // overrules the allowed tags.
    167. 

  167.     $this->assertHtmlToText(
    168. 

  168.       'Drupal <b>Drupal</b> Drupal',
    169. 

  169.       "Drupal *Drupal* Drupal\n",
    170. 

  170.       'Allowed <b> tag found',
    171. 

  171.       array('b')
    172. 

  172.     );
    173. 

  173.     $this->assertHtmlToText(
    174. 

  174.       'Drupal <h1>Drupal</h1> Drupal',
    175. 

  175.       "Drupal Drupal Drupal\n",
    176. 

  176.       'Disallowed <h1> tag not found',
    177. 

  177.       array('b')
    178. 

  178.     );
    179. 

  179. 

  180.     $this->assertHtmlToText(
    181. 

  181.       'Drupal <p><em><b>Drupal</b></em><p> Drupal',
    182. 

  182.       "Drupal Drupal Drupal\n",
    183. 

  183.       'Disallowed <p>, <em>, and <b> tags not found',
    184. 

  184.       array('a', 'br', 'h1')
    185. 

  185.     );
    186. 

  186. 

  187.     $this->assertHtmlToText(
    188. 

  188.       '<html><body>Drupal</body></html>',
    189. 

  189.       "Drupal\n",
    190. 

  190.       'Unsupported <html> and <body> tags not found',
    191. 

  191.       array('html', 'body')
    192. 

  192.     );
    193. 

  193.   }
    194. 

  194. 

  195.   /**
    196. 

  196.    * Test that whitespace is collapsed.
    197. 

  197.    */
    198. 

  198.   public function testDrupalHtmltoTextCollapsesWhitespace() {
    199. 

  199.     $input = "<p>Drupal  Drupal\n\nDrupal<pre>Drupal  Drupal\n\nDrupal</pre>Drupal  Drupal\n\nDrupal</p>";
    200. 

  200.     // @todo The whitespace should be collapsed.
    201. 

  201.     $collapsed = "Drupal  Drupal\n\nDrupalDrupal  Drupal\n\nDrupalDrupal  Drupal\n\nDrupal\n\n";
    202. 

  202.     $this->assertHtmlToText(
    203. 

  203.       $input,
    204. 

  204.       $collapsed,
    205. 

  205.       'Whitespace is collapsed',
    206. 

  206.       array('p')
    207. 

  207.     );
    208. 

  208.   }
    209. 

  209. 

  210.   /**
    211. 

  211.    * Test that text separated by block-level tags in HTML get separated by
    212. 

  212.    * (at least) a newline in the plaintext version.
    213. 

  213.    */
    214. 

  214.   public function testDrupalHtmlToTextBlockTagToNewline() {
    215. 

  215.     $input = '[text]'
    216. 

  216.       . '<blockquote>[blockquote]</blockquote>'
    217. 

  217.       . '<br />[br]'
    218. 

  218.       . '<dl><dt>[dl-dt]</dt>'
    219. 

  219.       . '<dt>[dt]</dt>'
    220. 

  220.       . '<dd>[dd]</dd>'
    221. 

  221.       . '<dd>[dd-dl]</dd></dl>'
    222. 

  222.       . '<h1>[h1]</h1>'
    223. 

  223.       . '<h2>[h2]</h2>'
    224. 

  224.       . '<h3>[h3]</h3>'
    225. 

  225.       . '<h4>[h4]</h4>'
    226. 

  226.       . '<h5>[h5]</h5>'
    227. 

  227.       . '<h6>[h6]</h6>'
    228. 

  228.       . '<hr />[hr]'
    229. 

  229.       . '<ol><li>[ol-li]</li>'
    230. 

  230.       . '<li>[li]</li>'
    231. 

  231.       . '<li>[li-ol]</li></ol>'
    232. 

  232.       . '<p>[p]</p>'
    233. 

  233.       . '<ul><li>[ul-li]</li>'
    234. 

  234.       . '<li>[li-ul]</li></ul>'
    235. 

  235.       . '[text]';
    236. 

  236.     $output = MailFormatHelper::htmlToText($input);
    237. 

  237.     $pass = $this->assertFalse(
    238. 

  238.       preg_match('/\][^\n]*\[/s', $output),
    239. 

  239.       'Block-level HTML tags should force newlines'
    240. 

  240.     );
    241. 

  241.     if (!$pass) {
    242. 

  242.       $this->verbose($this->stringToHtml($output));
    243. 

  243.     }
    244. 

  244.     $output_upper = Unicode::strtoupper($output);
    245. 

  245.     $upper_input = Unicode::strtoupper($input);
    246. 

  246.     $upper_output = MailFormatHelper::htmlToText($upper_input);
    247. 

  247.     $pass = $this->assertEqual(
    248. 

  248.       $upper_output,
    249. 

  249.       $output_upper,
    250. 

  250.       'Tag recognition should be case-insensitive'
    251. 

  251.     );
    252. 

  252.     if (!$pass) {
    253. 

  253.       $this->verbose(
    254. 

  254.         $upper_output
    255. 

  255.         . '<br />should  be equal to <br />'
    256. 

  256.         . $output_upper
    257. 

  257.       );
    258. 

  258.     }
    259. 

  259.   }
    260. 

  260. 

  261.   /**
    262. 

  262.    * Test that headers are properly separated from surrounding text.
    263. 

  263.    */
    264. 

  264.   public function testHeaderSeparation() {
    265. 

  265.     $html = 'Drupal<h1>Drupal</h1>Drupal';
    266. 

  266.     // @todo There should be more space above the header than below it.
    267. 

  267.     $text = "Drupal\n======== DRUPAL ==============================================================\n\nDrupal\n";
    268. 

  268.     $this->assertHtmlToText($html, $text,
    269. 

  269.       'Text before and after <h1> tag');
    270. 

  270.     $html = '<p>Drupal</p><h1>Drupal</h1>Drupal';
    271. 

  271.     // @todo There should be more space above the header than below it.
    272. 

  272.     $text = "Drupal\n\n======== DRUPAL ==============================================================\n\nDrupal\n";
    273. 

  273.     $this->assertHtmlToText($html, $text,
    274. 

  274.       'Paragraph before and text after <h1> tag');
    275. 

  275.     $html = 'Drupal<h1>Drupal</h1><p>Drupal</p>';
    276. 

  276.     // @todo There should be more space above the header than below it.
    277. 

  277.     $text = "Drupal\n======== DRUPAL ==============================================================\n\nDrupal\n\n";
    278. 

  278.     $this->assertHtmlToText($html, $text,
    279. 

  279.       'Text before and paragraph after <h1> tag');
    280. 

  280.     $html = '<p>Drupal</p><h1>Drupal</h1><p>Drupal</p>';
    281. 

  281.     $text = "Drupal\n\n======== DRUPAL ==============================================================\n\nDrupal\n\n";
    282. 

  282.     $this->assertHtmlToText($html, $text,
    283. 

  283.       'Paragraph before and after <h1> tag');
    284. 

  284.   }
    285. 

  285. 

  286.   /**
    287. 

  287.    * Test that footnote references are properly generated.
    288. 

  288.    */
    289. 

  289.   public function testFootnoteReferences() {
    290. 

  290.     global $base_path, $base_url;
    291. 

  291.     $source = '<a href="http://www.example.com/node/1">Host and path</a>'
    292. 

  292.       . '<br /><a href="http://www.example.com">Host, no path</a>'
    293. 

  293.       . '<br /><a href="' . $base_path . 'node/1">Path, no host</a>'
    294. 

  294.       . '<br /><a href="node/1">Relative path</a>';
    295. 

  295.     // @todo Footnote URLs should be absolute.
    296. 

  296.     $tt = "Host and path [1]"
    297. 

  297.       . "\nHost, no path [2]"
    298. 

  298.       // @todo The following two references should be combined.
    299. 

  299.       . "\nPath, no host [3]"
    300. 

  300.       . "\nRelative path [4]"
    301. 

  301.       . "\n"
    302. 

  302.       . "\n[1] http://www.example.com/node/1"
    303. 

  303.       . "\n[2] http://www.example.com"
    304. 

  304.       // @todo The following two references should be combined.
    305. 

  305.       . "\n[3] $base_url/node/1"
    306. 

  306.       . "\n[4] node/1\n";
    307. 

  307.     $this->assertHtmlToText($source, $tt, 'Footnotes');
    308. 

  308.   }
    309. 

  309. 

  310.   /**
    311. 

  311.    * Test that combinations of paragraph breaks, line breaks, linefeeds,
    312. 

  312.    * and spaces are properly handled.
    313. 

  313.    */
    314. 

  314.   public function testDrupalHtmlToTextParagraphs() {
    315. 

  315.     $tests = array();
    316. 

  316.     $tests[] = array(
    317. 

  317.         'html' => "<p>line 1<br />\nline 2<br />line 3\n<br />line 4</p><p>paragraph</p>",
    318. 

  318.         // @todo Trailing line breaks should be trimmed.
    319. 

  319.         'text' => "line 1\nline 2\nline 3\nline 4\n\nparagraph\n\n",
    320. 

  320.     );
    321. 

  321.     $tests[] = array(
    322. 

  322.       'html' => "<p>line 1<br /> line 2</p> <p>line 4<br /> line 5</p> <p>0</p>",
    323. 

  323.       // @todo Trailing line breaks should be trimmed.
    324. 

  324.       'text' => "line 1\nline 2\n\nline 4\nline 5\n\n0\n\n",
    325. 

  325.     );
    326. 

  326.     foreach ($tests as $test) {
    327. 

  327.       $this->assertHtmlToText($test['html'], $test['text'], 'Paragraph breaks');
    328. 

  328.     }
    329. 

  329.   }
    330. 

  330. 

  331.   /**
    332. 

  332.    * Tests \Drupal\Core\Mail\MailFormatHelper::htmlToText() wrapping.
    333. 

  333.    *
    334. 

  334.    * RFC 3676 says, "The Text/Plain media type is the lowest common
    335. 

  335.    * denominator of Internet email, with lines of no more than 998 characters."
    336. 

  336.    *
    337. 

  337.    * RFC 2046 says, "SMTP [RFC-821] allows a maximum of 998 octets before the
    338. 

  338.    * next CRLF sequence."
    339. 

  339.    *
    340. 

  340.    * RFC 821 says, "The maximum total length of a text line including the
    341. 

  341.    * <CRLF> is 1000 characters."
    342. 

  342.    */
    343. 

  343.   public function testVeryLongLineWrap() {
    344. 

  344.     $input = 'Drupal<br /><p>' . str_repeat('x', 2100) . '</p><br />Drupal';
    345. 

  345.     $output = MailFormatHelper::htmlToText($input);
    346. 

  346.     $eol = Settings::get('mail_line_endings', PHP_EOL);
    347. 

  347. 

  348.     $maximum_line_length = 0;
    349. 

  349.     foreach (explode($eol, $output) as $line) {
    350. 

  350.       // We must use strlen() rather than Unicode::strlen() in order to count
    351. 

  351.       // octets rather than characters.
    352. 

  352.       $maximum_line_length = max($maximum_line_length, strlen($line . $eol));
    353. 

  353.     }
    354. 

  354.     $verbose = 'Maximum line length found was ' . $maximum_line_length . ' octets.';
    355. 

  355.     $this->assertTrue($maximum_line_length <= 1000, $verbose);
    356. 

  356.   }
    357. 

  357. 

  358.   /**
    359. 

  359.    * Tests that trailing whitespace is removed before newlines.
    360. 

  360.    *
    361. 

  361.    * @see \Drupal\Core\Mail\MailFormatHelper::wrapMail()
    362. 

  362.    */
    363. 

  363.   public function testRemoveTrailingWhitespace() {
    364. 

  364.     $text = "Hi there! \nHerp Derp";
    365. 

  365.     $mail_lines = explode("\n", MailFormatHelper::wrapMail($text));
    366. 

  366.     $this->assertNotEqual(" ", substr($mail_lines[0], -1), 'Trailing whitespace removed.');
    367. 

  367.   }
    368. 

  368. 

  369.   /**
    370. 

  370.    * Tests that trailing whitespace from Usenet style signatures is not removed.
    371. 

  371.    *
    372. 

  372.    * RFC 3676 says, "This is a special case; an (optionally quoted or quoted and
    373. 

  373.    * stuffed) line consisting of DASH DASH SP is neither fixed nor flowed."
    374. 

  374.    *
    375. 

  375.    * @see \Drupal\Core\Mail\MailFormatHelper::wrapMail()
    376. 

  376.    */
    377. 

  377.   public function testUsenetSignature() {
    378. 

  378.     $text = "Hi there!\n-- \nHerp Derp";
    379. 

  379.     $mail_lines = explode("\n", MailFormatHelper::wrapMail($text));
    380. 

  380.     $this->assertEqual("-- ", $mail_lines[1], 'Trailing whitespace not removed for dash-dash-space signatures.');
    381. 

  381. 

  382.     $text = "Hi there!\n--  \nHerp Derp";
    383. 

  383.     $mail_lines = explode("\n", MailFormatHelper::wrapMail($text));
    384. 

  384.     $this->assertEqual("--", $mail_lines[1], 'Trailing whitespace removed for incorrect dash-dash-space signatures.');
    385. 

  385.   }
    386. 

  386. 

  387. }
    388. 

  388.