HWLDFWordAccumulatorTest.php

<?php

namespace Drupal\Tests\Component\Diff\Engine;

use Drupal\Component\Diff\Engine\HWLDFWordAccumulator;
use PHPUnit\Framework\TestCase;

/**
 * Test HWLDFWordAccumulator.
 *
 * @coversDefaultClass \Drupal\Component\Diff\Engine\HWLDFWordAccumulator
 *
 * @group Diff
 */
class HWLDFWordAccumulatorTest extends TestCase {
    
    /**
     * Verify that we only get back a NBSP from an empty accumulator.
     *
     * @covers ::getLines
     *
     * @see Drupal\Component\Diff\Engine\HWLDFWordAccumulator::NBSP
     */
    public function testGetLinesEmpty() {
        $acc = new HWLDFWordAccumulator();
        $this->assertEquals([
            '&#160;',
        ], $acc->getLines());
    }
    
    /**
     * @return array
     *   - Expected array of lines from getLines().
     *   - Array of strings for the $words parameter to addWords().
     *   - String tag for the $tag parameter to addWords().
     */
    public function provideAddWords() {
        return [
            [
                [
                    'wordword2',
                ],
                [
                    'word',
                    'word2',
                ],
                'tag',
            ],
            [
                [
                    'word',
                    'word2',
                ],
                [
                    'word',
                    "\nword2",
                ],
                'tag',
            ],
            [
                [
                    '&#160;',
                    'word2',
                ],
                [
                    '',
                    "\nword2",
                ],
                'tag',
            ],
        ];
    }
    
    /**
     * @covers ::addWords
     * @dataProvider provideAddWords
     */
    public function testAddWords($expected, $words, $tag) {
        $acc = new HWLDFWordAccumulator();
        $acc->addWords($words, $tag);
        $this->assertEquals($expected, $acc->getLines());
    }

}