class TextfieldTest

class TextfieldTest extends UnitTestCase {
  
  /**
   * @covers ::valueCallback
   *
   * @dataProvider providerTestValueCallback
   */
  public function testValueCallback($expected, $input) {
    $element = [];
    $form_state = $this->prophesize(FormStateInterface::class)
      ->reveal();
    $this->assertSame($expected, Textfield::valueCallback($element, $input, $form_state));
  }
  
  /**
   * Data provider for testValueCallback().
   */
  public function providerTestValueCallback() {
    $data = [];
    $data[] = [
      NULL,
      FALSE,
    ];
    $data[] = [
      NULL,
      NULL,
    ];
    $data[] = [
      '',
      [
        'test',
      ],
    ];
    $data[] = [
      'test',
      'test',
    ];
    $data[] = [
      '123',
      123,
    ];
    $data[] = [
      'testwithnewline',
      "test\nwith\rnewline",
    ];
    return $data;
  }

}