How to create a phpUnit test for images? - php

Question

I have a simple fileupload (image upload) which resizes this image to a smaller one. To create a phpUnit test for this resize function I need a mock object which represents an image.
Is the best practice to use a 'testimage' or is there a better way??

Answer 1

<?php
namespace tests\control;
use SebastianBergmann\CodeCoverage\TestCase;
class FileHandlerTest extends TestCase
{
/**
* #var array
*/
private $files = [];
/**
* Put your temp image into your filesystem.
* (Not good as unit tests must work with any system,
* but my research about mocking resources gave me nothing)
*/
protected function setUp()
{
if (file_exists(dirname(__FILE__) . '/testImage.jpg')) {
try {
rmdir(dirname(__FILE__) . '/testImage.jpg');
} catch (\Exception $e) {
throw new \Exception('You have no permission to delete files in this directory:' . $e);
}
} else {
$image = imagecreate(500, 500);
try {
imagejpeg($image, dirname(__FILE__) . '/testImage.jpg');
} catch (\Exception $e) {
throw new \Exception('You have no permission to create files in this directory:' . $e);
}
}
$this->files[] = '/testImage.jpg';
}
public function testOperation()
{
$example = new \FileHandler($this->files, dirname(__FILE__));
/**
* Set here all the variable inside your file,
* your code isn't working at this moment.
* Properties to set: uploadFolder, files
*/
$example->process();
/**
* Get you new image from test dir here.
* It's yours TODO :p
*/
/** #var resource $newPicture */
$size = getimagesize($newPicture);
/**
* also count it yourself, as I can't reproduce your code
*/
$this->assertEquals('200', $size[0]);
$this->assertEquals('200', $size[1]);
}
/**
* Deleting of test images. No try/catch here as it would fire on setup
*/
protected function tearDown()
{
if (file_exists(dirname(__FILE__) . '/testImage.jpeg')) {
rmdir(dirname(__FILE__) . '/testImage.jpeg');
}
if (file_exists(dirname(__FILE__) . '/newImage.jpeg')) {
rmdir(dirname(__FILE__) . '/newImage.jpeg');
}
}
}
You still have to make some work about it. And I'd prefer not to test such things. SetUp-method's comment is about it.