class PagerPluginBaseTest

class PagerPluginBaseTest extends UnitTestCase {

  /**
   * The mock pager plugin instance.
   *
   * @var \Drupal\views\Plugin\views\pager\PagerPluginBase|\PHPUnit\Framework\MockObject\MockObject
   */
  protected $pager;

  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $this->pager = $this
      ->getMockBuilder('Drupal\\views\\Plugin\\views\\pager\\PagerPluginBase')
      ->disableOriginalConstructor()
      ->getMockForAbstractClass();
    $view = $this
      ->getMockBuilder('Drupal\\views\\ViewExecutable')
      ->disableOriginalConstructor()
      ->getMock();
    $display = $this
      ->getMockBuilder('Drupal\\views\\Plugin\\views\\display\\DisplayPluginBase')
      ->disableOriginalConstructor()
      ->getMock();
    $options = [
      'items_per_page' => 5,
      'offset' => 1,
    ];
    $this->pager
      ->init($view, $display, $options);
    $this->pager->current_page = 1;
  }

  /**
   * Tests the getItemsPerPage() method.
   *
   * @see \Drupal\views\Plugin\views\pager\PagerPluginBase::getItemsPerPage()
   */
  public function testGetItemsPerPage() {
    $this
      ->assertEquals(5, $this->pager
      ->getItemsPerPage());
  }

  /**
   * Tests the setItemsPerPage() method.
   *
   * @see \Drupal\views\Plugin\views\pager\PagerPluginBase::setItemsPerPage()
   */
  public function testSetItemsPerPage() {
    $this->pager
      ->setItemsPerPage(6);
    $this
      ->assertEquals(6, $this->pager
      ->getItemsPerPage());
  }

  /**
   * Tests the getOffset() method.
   *
   * @see \Drupal\views\Plugin\views\pager\PagerPluginBase::getOffset()
   */
  public function testGetOffset() {
    $this
      ->assertEquals(1, $this->pager
      ->getOffset());
  }

  /**
   * Tests the setOffset() method.
   *
   * @see \Drupal\views\Plugin\views\pager\PagerPluginBase::setOffset()
   */
  public function testSetOffset() {
    $this->pager
      ->setOffset(2);
    $this
      ->assertEquals(2, $this->pager
      ->getOffset());
  }

  /**
   * Tests the getCurrentPage() method.
   *
   * @see \Drupal\views\Plugin\views\pager\PagerPluginBase::getCurrentPage()
   */
  public function testGetCurrentPage() {
    $this
      ->assertEquals(1, $this->pager
      ->getCurrentPage());
  }

  /**
   * Tests the setCurrentPage() method.
   *
   * @see \Drupal\views\Plugin\views\pager\PagerPluginBase::setCurrentPage()
   */
  public function testSetCurrentPage() {
    $this->pager
      ->setCurrentPage(2);
    $this
      ->assertEquals(2, $this->pager
      ->getCurrentPage());

    // A non numeric number or number below 0 should return 0.
    $this->pager
      ->setCurrentPage('two');
    $this
      ->assertEquals(0, $this->pager
      ->getCurrentPage());
    $this->pager
      ->setCurrentPage(-2);
    $this
      ->assertEquals(0, $this->pager
      ->getCurrentPage());
  }

  /**
   * Tests the getTotalItems() method.
   *
   * @see \Drupal\views\Plugin\views\pager\PagerPluginBase::getTotalItems()
   */
  public function testGetTotalItems() {

    // Should return 0 by default.
    $this
      ->assertEquals(0, $this->pager
      ->getTotalItems());
    $this->pager->total_items = 10;
    $this
      ->assertEquals(10, $this->pager
      ->getTotalItems());
  }

  /**
   * Tests the getPagerId() method.
   *
   * @see \Drupal\views\Plugin\views\pager\PagerPluginBase::getPagerId()
   */
  public function testGetPagerId() {

    // Should return 0 if 'id' is not set.
    $this
      ->assertEquals(0, $this->pager
      ->getPagerId());
    $this->pager->options['id'] = 1;
    $this
      ->assertEquals(1, $this->pager
      ->getPagerId());
  }

  /**
   * Tests the usePager() method.
   *
   * @see \Drupal\views\Plugin\views\pager\PagerPluginBase::usePager()
   */
  public function testUsePager() {
    $this
      ->assertTrue($this->pager
      ->usePager());
  }

  /**
   * Tests the useCountQuery() method.
   *
   * @see \Drupal\views\Plugin\views\pager\PagerPluginBase::useCountQuery()
   */
  public function testUseCountQuery() {
    $this
      ->assertTrue($this->pager
      ->useCountQuery());
  }

  /**
   * Tests the usesExposed() method.
   *
   * @see \Drupal\views\Plugin\views\pager\PagerPluginBase::usedExposed()
   */
  public function testUsesExposed() {
    $this
      ->assertFalse($this->pager
      ->usesExposed());
  }

  /**
   * Tests the hasMoreRecords() method.
   *
   * @dataProvider providerTestHasMoreRecords
   *
   * @see \Drupal\views\Plugin\views\pager\PagerPluginBase::hasMoreRecords()
   */
  public function testHasMoreRecords($items_per_page, $total_items, $current_page, $has_more_records) {
    $this->pager
      ->setItemsPerPage($items_per_page);
    $this->pager->total_items = $total_items;
    $this->pager
      ->setCurrentPage($current_page);
    $this
      ->assertEquals($has_more_records, $this->pager
      ->hasMoreRecords());
  }

  /**
   * Provides test data for the hasMoreRecord method test.
   *
   * @see self::testHasMoreRecords
   */
  public static function providerTestHasMoreRecords() {
    return [
      // No items per page, so there can't be more available records.
      [
        0,
        0,
        0,
        FALSE,
      ],
      [
        0,
        10,
        0,
        FALSE,
      ],
      // The amount of total items equals the items per page, so there is no
      // next page available.
      [
        5,
        5,
        0,
        FALSE,
      ],
      // There is one more item, and we are at the first page.
      [
        5,
        6,
        0,
        TRUE,
      ],
      // Now we are on the second page, which has just a single one left.
      [
        5,
        6,
        1,
        FALSE,
      ],
      // Increase the total items, so we have some available on the third page.
      [
        5,
        12,
        1,
        TRUE,
      ],
    ];
  }

  /**
   * Tests the executeCountQuery method without a set offset.
   *
   * @see \Drupal\views\Plugin\views\pager\PagerPluginBase::executeCountQuery()
   */
  public function testExecuteCountQueryWithoutOffset() {
    $statement = $this
      ->createMock('\\Drupal\\Tests\\views\\Unit\\Plugin\\pager\\TestStatementInterface');
    $statement
      ->expects($this
      ->once())
      ->method('fetchField')
      ->willReturn(3);
    $query = $this
      ->getMockBuilder('\\Drupal\\Core\\Database\\Query\\Select')
      ->disableOriginalConstructor()
      ->getMock();
    $query
      ->expects($this
      ->once())
      ->method('execute')
      ->willReturn($statement);
    $this->pager
      ->setOffset(0);
    $this
      ->assertEquals(3, $this->pager
      ->executeCountQuery($query));
  }

  /**
   * Tests the executeCountQuery method with a set offset.
   *
   * @see \Drupal\views\Plugin\views\pager\PagerPluginBase::executeCountQuery()
   */
  public function testExecuteCountQueryWithOffset() {
    $statement = $this
      ->createMock('\\Drupal\\Tests\\views\\Unit\\Plugin\\pager\\TestStatementInterface');
    $statement
      ->expects($this
      ->once())
      ->method('fetchField')
      ->willReturn(3);
    $query = $this
      ->getMockBuilder('\\Drupal\\Core\\Database\\Query\\Select')
      ->disableOriginalConstructor()
      ->getMock();
    $query
      ->expects($this
      ->once())
      ->method('execute')
      ->willReturn($statement);
    $this->pager
      ->setOffset(2);
    $this
      ->assertEquals(1, $this->pager
      ->executeCountQuery($query));
  }

  /**
   * Tests the executeCountQuery method with an offset larger than result count.
   *
   * @see \Drupal\views\Plugin\views\pager\PagerPluginBase::executeCountQuery()
   */
  public function testExecuteCountQueryWithOffsetLargerThanResult() {
    $statement = $this
      ->createMock(TestStatementInterface::class);
    $statement
      ->expects($this
      ->once())
      ->method('fetchField')
      ->willReturn(2);
    $query = $this
      ->getMockBuilder(Select::class)
      ->disableOriginalConstructor()
      ->getMock();
    $query
      ->expects($this
      ->once())
      ->method('execute')
      ->willReturn($statement);
    $this->pager
      ->setOffset(3);
    $this
      ->assertEquals(0, $this->pager
      ->executeCountQuery($query));
  }

}