void FillMeUp(char* in_string) {'.
            '
  int i = 0;
  while (in_string[i] != \'\0\') {
    in_string[i] = \'X\';
    i++;
  }
'.
            '}

 section are Unicode NBSPs - they may not be displayed in your editor.
        $strconv = << [
                '[edit]',
                [],
                '',
            ],
            'Image alt tag between strings' => [
                'xx[some gif]xx',
                [
                    'dolinks' => false,
                ],
                'xxxx',
            ],
            'core_text integration' => [
                'ŽLUŤOUČKÝ KONÍČEK',
                ['dolinks' => false],
                'Žluťoučký koníček',
            ],
            'No strip slashes in a tag' => [
                '[\edit]',
                [],
                '',
            ],
            'No strip slashes in a string' => [
                '\\magic\\quotes\\are\\\\horrible',
                [],
                '\\magic\\quotes\\are\\\\horrible',
            ],
            'Protect "0"' => [
                '0',
                ['dolinks' => false],
                '0',
            ],
            'Invalid HTML 1' => [
                'Gin & Tonic',
                [],
                'Gin & Tonic',
            ],
            'Invalid HTML 2' => [
                'Gin > Tonic',
                [],
                'Gin > Tonic',
            ],
            'Invalid HTML 3' => [
                'Gin < Tonic',
                [],
                'Gin < Tonic',
            ],
            'Simple test 1' => [
                "_Hello_ WORLD!\n",
                [],
                '
Hello world!
',
            ],
            'Simple test 2' => [
                "All the WORLD’S a stage.\n\n-- William Shakespeare\n",
                [],
                '
All the world’s a stage.
-- William Shakespeare
',
            ],
            'Simple test 3' => [
                "HELLO WORLD!\n\n",
                [],
                '
Hello world!
',
            ],
            'Simple test 4' => [
                "Hello\nworld!",
                [],
                'Hello
world!',
            ],
            'No wrapping when width set to 0' => [
                $long,
                ['width' => 0],
                $long,
            ],
            'Wrapping when width set to default' => [
                $wrapped,
                [],
                $long,
            ],
            'Trailing whitespace removal' => [
                'With trailing whitespace and some more text',
                [],
                "With trailing whitespace   \nand some   more text",
            ],
            'PRE parsing' => [
                $strconv,
                [],
                $strorig,
            ],
            'Strip script tags' => [
                'Interesting text',
                [],
                'Interesting  text',
            ],
            'Trailing spaces before newline or tab' => [
                "Some text with trailing space\n\nAnd some more text\n",
                [],
                '
Some text with trailing space 
 
And some more text
',
            ],
            'Trailing spaces before newline or tab (list)' => [
                "\t* Some text with trailing space\n\t* And some more text\n\n",
                [],
                '
Some text with trailing space 
 
 And some more text 
 
',
            ],
        ];
    }

    /**
     * Test html2text with various examples.
     *
     * @dataProvider examples_provider
     * @param string $expected
     * @param array $options
     * @param string $html
     */
    public function test_runner(
        string $expected,
        array $options,
        string $html,
    ): void {
        $this->assertSame($expected, html_to_text($html, ...$options));
    }

    /**
     * Test the links list enumeration.
     */
    public function test_build_link_list(): void {

        // Note the trailing whitespace left intentionally in the text after first link.
        $text = 'Total of      ' . '
            27 issues and some other
have been fixed last week';

        // Do not collect links.
        $result = html_to_text($text, 5000, false);
        $this->assertSame('Total of 27 ISSUES and some other have been fixed LAST WEEK', $result);

        // Collect and enumerate links.
        $result = html_to_text($text, 5000, true);
        $this->assertSame(0, strpos($result, 'Total of 27 ISSUES [1] and some [2] other have been fixed LAST WEEK [3]'));
        $this->assertSame(false, strpos($result, '[0]'));
        $this->assertSame(1, preg_match('|^'.preg_quote('[1] http://tr.mdl.org/sh.jspa?r=1&j=p+%3D+%22I+d%22+%3D').'$|m', $result));
        $this->assertSame(1, preg_match('|^'.preg_quote('[2] http://another.url/?f=a&b=2').'$|m', $result));
        $this->assertSame(1, preg_match('|^'.preg_quote('[3] http://third.url/view.php').'$|m', $result));
        $this->assertSame(false, strpos($result, '[4]'));

        // Test multiple occurrences of the same URL.
        $text = '
See moodle.org,
            google, univ-lemans
            and google.
            Also try google via HTTPS.';
        $result = html_to_text($text, 5000, true);
        $this->assertSame(0, strpos($result, 'See moodle.org [1], google [2], univ-lemans [3] and google [2]. Also try google via HTTPS [4].'));
        $this->assertSame(false, strpos($result, '[0]'));
        $this->assertSame(1, preg_match('|^'.preg_quote('[1] http://moodle.org').'$|m', $result));
        $this->assertSame(1, preg_match('|^'.preg_quote('[2] http://www.google.fr').'$|m', $result));
        $this->assertSame(1, preg_match('|^'.preg_quote('[3] http://www.univ-lemans.fr').'$|m', $result));
        $this->assertSame(1, preg_match('|^'.preg_quote('[4] https://www.google.fr').'$|m', $result));
        $this->assertSame(false, strpos($result, '[5]'));
    }
}