imagick_smartcrop.test in Imagick 7

Tests for the smartcrop module.

File

imagick_smartcrop/imagick_smartcrop.test

<?php

/**
 * @file
 * Tests for the smartcrop module.
 */
class SmartcropImagickTestCase extends DrupalWebTestCase {
  protected $admin_user;
  public static function getInfo() {
    return array(
      'name' => t('Smartcrop Imagick test'),
      'description' => t('Test Smartcrop Imagick.'),
      'group' => t('Image'),
    );
  }
  function setUp() {
    parent::setUp();
    module_enable(array(
      'smartcrop',
    ));
  }

  /**
   * Verify the entropy calculation with a known image.
   */
  function testEntropy() {

    // Create a test image with 3 red, 3 green, and 3 blue pixels.
    $im = new Imagick();
    $im
      ->newImage(3, 1, '#ff0000');
    $im
      ->newImage(3, 1, '#00ff00');
    $im
      ->newImage(3, 1, '#0000ff');
    $im
      ->resetIterator();
    $image = new stdClass();
    $image->resource = $im
      ->appendImages(true);

    // Calculate the expected values.
    // There are 9 bins in the histogram, 3 colors * 3 channels.
    $expected_entroy = (1 / 3 * log(1 / 9, 2) + 2 / 3 * log(2 / 9, 2)) * -1;
    $image_entropy = _smartcrop_imagick_entropy_slice($image, 0, 0, 3, 3);
    $this
      ->assertTrue($image_entropy - $expected_entroy < 0.001, t('Entropy value is correct.'));
  }

}

Classes

Name	Description
SmartcropImagickTestCase	@file Tests for the smartcrop module.