class CategoryAutocompleteTest

class CategoryAutocompleteTest extends UnitTestCase {
  
  /**
   * The autocomplete controller.
   *
   * @var \Drupal\block\Controller\CategoryAutocompleteController
   */
  protected $autocompleteController;
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $block_manager = $this->createMock('Drupal\\Core\\Block\\BlockManagerInterface');
    $block_manager->expects($this->any())
      ->method('getCategories')
      ->willReturn([
      'Comment',
      'Node',
      'None & Such',
      'User',
    ]);
    $this->autocompleteController = new CategoryAutocompleteController($block_manager);
  }
  
  /**
   * Tests the autocomplete method.
   *
   * @param string $string
   *   The string entered into the autocomplete.
   * @param array $suggestions
   *   The array of expected suggestions.
   *
   * @see \Drupal\block\Controller\CategoryAutocompleteController::autocomplete()
   *
   * @dataProvider providerTestAutocompleteSuggestions
   */
  public function testAutocompleteSuggestions($string, $suggestions) : void {
    $suggestions = array_map(function ($suggestion) {
      return [
        'value' => $suggestion,
        'label' => Html::escape($suggestion),
      ];
    }, $suggestions);
    $result = $this->autocompleteController
      ->autocomplete(new Request([
      'q' => $string,
    ]));
    $this->assertSame($suggestions, json_decode($result->getContent(), TRUE));
  }
  
  /**
   * Data provider for testAutocompleteSuggestions().
   *
   * @return array
   */
  public static function providerTestAutocompleteSuggestions() {
    $test_parameters = [];
    $test_parameters[] = [
      'string' => 'Com',
      'suggestions' => [
        'Comment',
      ],
    ];
    $test_parameters[] = [
      'string' => 'No',
      'suggestions' => [
        'Node',
        'None & Such',
      ],
    ];
    $test_parameters[] = [
      'string' => 'us',
      'suggestions' => [
        'User',
      ],
    ];
    $test_parameters[] = [
      'string' => 'Banana',
      'suggestions' => [],
    ];
    return $test_parameters;
  }

}