update_create_fetch_task example

  public function testFetchTasks() {
    $projecta = [
      'name' => 'aaa_update_test',
    ];
    $projectb = [
      'name' => 'bbb_update_test',
    ];
    $queue = \Drupal::queue('update_fetch_tasks');
    $this->assertEquals(0, $queue->numberOfItems(), 'Queue is empty');
    update_create_fetch_task($projecta);
    $this->assertEquals(1, $queue->numberOfItems(), 'Queue contains one item');
    update_create_fetch_task($projectb);
    $this->assertEquals(2, $queue->numberOfItems(), 'Queue contains two items');
    // Try to add a project again.     update_create_fetch_task($projecta);
    $this->assertEquals(2, $queue->numberOfItems(), 'Queue still contains two items');

    // Clear storage and try again.     update_storage_clear();
    update_create_fetch_task($projecta);
    $this->assertEquals(2, $queue->numberOfItems(), 'Queue contains two items');
  }