class ColorTest

1. 9.x drupal/core/modules/color/lib/Drupal/color/Tests/ColorTest.php \Drupal\color\Tests\ColorTest
2. 9.x drupal/core/modules/system/lib/Drupal/system/Tests/Common/ColorTest.php \Drupal\system\Tests\Common\ColorTest

class ColorTest extends UnitTestBase {
  public static function getInfo() {
    return array(
      'name' => 'Color conversion',
      'description' => 'Tests Color utility class conversions.',
      'group' => 'Common',
    );
  }

  /**
   * Tests Color::hexToRgb().
   */
  function testHexToRgb() {

    // Any invalid arguments should throw an exception.
    $values = array(
      '',
      '-1',
      '1',
      '12',
      '12345',
      '1234567',
      '123456789',
      '123456789a',
      'foo',
    );

    // Duplicate all invalid value tests with additional '#' prefix.
    // The '#' prefix inherently turns the data type into a string.
    foreach ($values as $value) {
      $values[] = '#' . $value;
    }

    // Add invalid data types (hex value must be a string).
    $values = array_merge($values, array(
      1,
      12,
      1234,
      12345,
      123456,
      1234567,
      12345678,
      123456789,
      123456789,
      -1,
      PHP_INT_MAX,
      PHP_INT_MAX + 1,
      -PHP_INT_MAX,
      0x0,
      0x10,
    ));
    foreach ($values as $test) {
      $this
        ->assertFalse(Color::validateHex($test), var_export($test, TRUE) . ' is invalid.');
      try {
        Color::hexToRgb($test);
        $this
          ->fail('Color::hexToRgb(' . var_export($test, TRUE) . ') did not throw an exception.');
      } catch (\InvalidArgumentException $e) {
        $this
          ->pass('Color::hexToRgb(' . var_export($test, TRUE) . ') threw an exception.');
      }
    }

    // PHP automatically casts a numeric array key into an integer.
    // Since hex values may consist of 0-9 only, they need to be defined as
    // array values.
    $tests = array(
      // Shorthands without alpha.
      array(
        'hex' => '#000',
        'rgb' => array(
          'red' => 0,
          'green' => 0,
          'blue' => 0,
        ),
      ),
      array(
        'hex' => '#fff',
        'rgb' => array(
          'red' => 255,
          'green' => 255,
          'blue' => 255,
        ),
      ),
      array(
        'hex' => '#abc',
        'rgb' => array(
          'red' => 170,
          'green' => 187,
          'blue' => 204,
        ),
      ),
      array(
        'hex' => 'cba',
        'rgb' => array(
          'red' => 204,
          'green' => 187,
          'blue' => 170,
        ),
      ),
      // Full without alpha.
      array(
        'hex' => '#000000',
        'rgb' => array(
          'red' => 0,
          'green' => 0,
          'blue' => 0,
        ),
      ),
      array(
        'hex' => '#ffffff',
        'rgb' => array(
          'red' => 255,
          'green' => 255,
          'blue' => 255,
        ),
      ),
      array(
        'hex' => '#010203',
        'rgb' => array(
          'red' => 1,
          'green' => 2,
          'blue' => 3,
        ),
      ),
    );
    foreach ($tests as $test) {
      $result = Color::hexToRgb($test['hex']);
      $this
        ->assertIdentical($result, $test['rgb']);
    }
  }

  /**
   * Tests Color::rgbToHex().
   */
  function testRgbToHex() {
    $tests = array(
      '#000000' => array(
        'red' => 0,
        'green' => 0,
        'blue' => 0,
      ),
      '#ffffff' => array(
        'red' => 255,
        'green' => 255,
        'blue' => 255,
      ),
      '#777777' => array(
        'red' => 119,
        'green' => 119,
        'blue' => 119,
      ),
      '#010203' => array(
        'red' => 1,
        'green' => 2,
        'blue' => 3,
      ),
    );

    // Input using named RGB array (e.g., as returned by Color::hexToRgb()).
    foreach ($tests as $expected => $rgb) {
      $this
        ->assertIdentical(Color::rgbToHex($rgb), $expected);
    }

    // Input using indexed RGB array (e.g.: array(10, 10, 10)).
    foreach ($tests as $expected => $rgb) {
      $rgb = array_values($rgb);
      $this
        ->assertIdentical(Color::rgbToHex($rgb), $expected);
    }

    // Input using CSS RGB string notation (e.g.: 10, 10, 10).
    foreach ($tests as $expected => $rgb) {
      $rgb = implode(', ', $rgb);
      $this
        ->assertIdentical(Color::rgbToHex($rgb), $expected);
    }
  }

}