class BlockTest

class BlockTest extends UnitTestCase {
  
  /**
   * The view executable.
   *
   * @var \Drupal\views\ViewExecutable|\PHPUnit\Framework\MockObject\MockObject
   */
  protected $executable;
  
  /**
   * The views block plugin.
   *
   * @var \Drupal\views\Plugin\Block\ViewsBlock|\PHPUnit\Framework\MockObject\MockObject
   */
  protected $blockPlugin;
  
  /**
   * The tested block display plugin.
   *
   * @var \Drupal\views\Plugin\views\display\Block|\PHPUnit\Framework\MockObject\MockObject
   */
  protected $blockDisplay;
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $this->executable = $this->getMockBuilder('Drupal\\views\\ViewExecutable')
      ->disableOriginalConstructor()
      ->onlyMethods([
      'executeDisplay',
      'setDisplay',
      'setItemsPerPage',
    ])
      ->getMock();
    $this->executable
      ->expects($this->any())
      ->method('setDisplay')
      ->with('block_1')
      ->willReturn(TRUE);
    $this->blockDisplay = $this->executable->display_handler = $this->getMockBuilder('Drupal\\views\\Plugin\\views\\display\\Block')
      ->disableOriginalConstructor()
      ->onlyMethods([])
      ->getMock();
    $this->blockDisplay->view = $this->executable;
    $this->blockPlugin = $this->getMockBuilder('Drupal\\views\\Plugin\\Block\\ViewsBlock')
      ->disableOriginalConstructor()
      ->getMock();
  }
  
  /**
   * Tests the build method with no overriding.
   *
   * @todo Delete the last two cases in https://www.drupal.org/project/drupal/issues/3521221. The last one is `intval('none')`.
   */
  public function testBuildNoOverride($items_per_page_setting) : void {
    $this->executable
      ->expects($this->never())
      ->method('setItemsPerPage');
    $this->blockPlugin
      ->expects($this->once())
      ->method('getConfiguration')
      ->willReturn([
      'items_per_page' => $items_per_page_setting,
    ]);
    $this->blockDisplay
      ->preBlockBuild($this->blockPlugin);
  }
  
  /**
   * Tests the build method with overriding items per page.
   */
  public function testBuildOverride(mixed $input, int $expected) : void {
    $this->executable
      ->expects($this->once())
      ->method('setItemsPerPage')
      ->with($expected);
    $this->blockPlugin
      ->expects($this->once())
      ->method('getConfiguration')
      ->willReturn([
      'items_per_page' => $input,
    ]);
    $this->blockDisplay
      ->preBlockBuild($this->blockPlugin);
  }

}