Issue #3259090 by Lendude, mr.york, Pandepoulus: Exposed filter equality check...

        }

        if ($this->operator != 'empty' && $this->operator != 'not empty') {

          if ($value == 'All' || $value === []) {

          if ($value == 'All' || $value === 0 || $value === []) {

            return FALSE;

          }

<?php

namespace Drupal\Tests\views\Unit\Plugin\filter;

use Drupal\Tests\UnitTestCase;

use Drupal\views\Plugin\views\filter\FilterPluginBase;

/**

 * @coversDefaultClass \Drupal\views\Plugin\views\filter\FilterPluginBase

 * @group views

 */

class FilterPluginBaseTest extends UnitTestCase {

  /**

   * @covers ::acceptExposedInput

   *

   * @dataProvider acceptExposedInputProvider

   */

  public function testAcceptExposedInput(bool $expected_result, array $options, array $input) {

    $definition = [

      'title' => 'Accept exposed input Test',

      'group' => 'Test',

    ];

    $filter = new FilterPluginBaseStub([], 'stub', $definition);

    $filter->options = $options;

    $this->assertSame($expected_result, $filter->acceptExposedInput($input));

  }

  /**

   * The data provider for testAcceptExposedInput.

   *

   * @return array

   *   The data set.

   */

  public function acceptExposedInputProvider() {

    return [

      'not-exposed' => [TRUE, ['exposed' => FALSE], []],

      'exposed-no-input' => [TRUE, ['exposed' => TRUE], []],

      'exposed-zero-input' => [FALSE, [

        'exposed' => TRUE,

        'is_grouped' => FALSE,

        'expose' => [

          'use_operator' => TRUE,

          'operator_id' => '=',

          'identifier' => 'identifier',

        ],

      ], ['identifier' => 0],

      ],

      'exposed-empty-array-input' => [FALSE, [

        'exposed' => TRUE,

        'is_grouped' => FALSE,

        'expose' => [

          'use_operator' => TRUE,

          'operator_id' => '=',

          'identifier' => 'identifier',

        ],

      ], ['identifier' => []],

      ],

    ];

  }

}

class FilterPluginBaseStub extends FilterPluginBase {}