class BlockHookOperationTest

class BlockHookOperationTest extends BrowserTestBase {
  
  /**
   * {@inheritdoc}
   */
  protected static $modules = [
    'block',
    'entity_test',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $permissions = [
      'administer blocks',
    ];
    // Create and log in user.
    $admin_user = $this->drupalCreateUser($permissions);
    $this->drupalLogin($admin_user);
  }
  
  /**
   * Tests the block list to see if the test_operation link is added.
   */
  public function testBlockOperationAlter() : void {
    // Add a test block, any block will do.
    // Set the machine name so the test_operation link can be built later.
    $block_id = $this->randomMachineName(16);
    $this->drupalPlaceBlock('system_powered_by_block', [
      'id' => $block_id,
    ]);
    // Get the Block listing.
    $this->drupalGet('admin/structure/block');
    $test_operation_link = 'admin/structure/block/manage/' . $block_id . '/test_operation';
    // Test if the test_operation link is on the page.
    $this->assertSession()
      ->linkByHrefExists($test_operation_link);
  }

}