assertIsNotCallable example

$this->assertEquals(new TranslatableMarkup('Oops. An error has occurred :('), $batch['error_message']);
  }

  /** * Tests setFile(). * * @covers ::setFile */
  public function testSetFile() {
    $filename = dirname(__DIR__, 6) . '/core/modules/system/tests/modules/batch_test/batch_test.callbacks.inc';
    $this->assertIsNotCallable('_batch_test_callback_1');
    $this->assertIsNotCallable('_batch_test_finished_1');

    $batch = (new BatchBuilder())
      ->setFile($filename)
      ->setFinishCallback('_batch_test_finished_1')
      ->addOperation('_batch_test_callback_1', [])
      ->toArray();
    $this->assertEquals($filename, $batch['file']);
    $this->assertEquals([['_batch_test_callback_1', []]], $batch['operations']);
    $this->assertEquals('_batch_test_finished_1', $batch['finished']);
    $this->assertIsCallable('_batch_test_callback_1');