Issue #3218647 by luisrhaas, DamienMcKenna, Anybody: Remove line breaks from meta tag output.

   *   The meta tag value after processing.

   */

  protected function tidy($value) {

    $value = str_replace(["\r\n", "\n", "\r", "\t"], ' ', $value);

    $value = preg_replace('/\s+/', ' ', $value);

    return trim($value);

  }

<?php

namespace Drupal\metatag\Unit;

use Drupal\metatag\Plugin\metatag\Tag\MetaNameBase;

use Drupal\Tests\UnitTestCase;

/**

 * This class provides methods for testing the MetaNameBase class.

 *

 * @group metatag

 */

class MetaNameBaseTest extends UnitTestCase {

  /**

   * The MetaNameBase Mocked Object.

   *

   * @var \Drupal\metatag\Plugin\metatag\Tag\MetaNameBase|\PHPUnit\Framework\MockObject\MockObject

   */

  protected $metaNameBase;

  /**

   * {@inheritDoc}

   */

  protected function setUp(): void {

    parent::setUp();

    // Mocking cause it's an abstract class.

    $this->metaNameBase = $this->getMockBuilder(MetaNameBase::class)

      ->setConstructorArgs([[], 'test', []])

      ->disableOriginalConstructor()

      ->getMockForAbstractClass();

  }

  /**

   * Tests the tidy method.

   */

  public function testTidy() {

    $method = "tidy";

    $class = new \ReflectionClass(get_class($this->metaNameBase));

    $method = $class->getMethod($method);

    // Set the protected method tidy to be accessible.

    $method->setAccessible(TRUE);

    $filterResult1 = $method->invoke($this->metaNameBase, "  Test   123  ");

    $this->assertEquals('Test 123', $filterResult1);

    $filterResult2 = $method->invoke($this->metaNameBase, '  Test   123    Test');

    $this->assertEquals('Test 123 Test', $filterResult2);

    $filterResult3 = $method->invoke(

          $this->metaNameBase,

          "Test \n\n123\n  Test  \n  "

      );

    $this->assertEquals('Test 123 Test', $filterResult3);

    $filterResult4 = $method->invoke(

          $this->metaNameBase,

          "Test \r\n\r\n 123  \r\n "

      );

    $this->assertEquals('Test 123', $filterResult4);

    $filterResult5 = $method->invoke(

          $this->metaNameBase,

          "Test \t\t123  \tTest"

      );

    $this->assertEquals('Test 123 Test', $filterResult5);

  }

}