shlink/module/Common/test/Service/PreviewGeneratorTest.php

<?php
namespace ShlinkioTest\Shlink\Common\Service;

use mikehaertl\wkhtmlto\Image;
use PHPUnit\Framework\TestCase;
use Prophecy\Argument;
use Prophecy\Prophecy\ObjectProphecy;
use Shlinkio\Shlink\Common\Image\ImageBuilder;
use Shlinkio\Shlink\Common\Service\PreviewGenerator;
use Symfony\Component\Filesystem\Filesystem;
use Zend\ServiceManager\ServiceManager;

class PreviewGeneratorTest extends TestCase
{
    /**
     * @var PreviewGenerator
     */
    protected $generator;
    /**
     * @var ObjectProphecy
     */
    protected $image;
    /**
     * @var ObjectProphecy
     */
    protected $filesystem;

    public function setUp()
    {
        $this->image = $this->prophesize(Image::class);
        $this->filesystem = $this->prophesize(Filesystem::class);

        $this->generator = new PreviewGenerator(new ImageBuilder(new ServiceManager(), [
            'factories' => [
                Image::class => function () {
                    return $this->image->reveal();
                },
            ]
        ]), $this->filesystem->reveal(), 'dir');
    }

    /**
     * @test
     */
    public function alreadyProcessedElementsAreNotProcessed()
    {
        $url = 'http://foo.com';
        $this->filesystem->exists(sprintf('dir/preview_%s.png', urlencode($url)))->willReturn(true)
                                                                                 ->shouldBeCalledTimes(1);
        $this->image->saveAs(Argument::cetera())->shouldBeCalledTimes(0);
        $this->assertEquals(sprintf('dir/preview_%s.png', urlencode($url)), $this->generator->generatePreview($url));
    }

    /**
     * @test
     */
    public function nonProcessedElementsAreProcessed()
    {
        $url = 'http://foo.com';
        $cacheId = sprintf('preview_%s.png', urlencode($url));
        $expectedPath = 'dir/' . $cacheId;

        $this->filesystem->exists(sprintf('dir/preview_%s.png', urlencode($url)))->willReturn(false)
                                                                                 ->shouldBeCalledTimes(1);

        $this->image->saveAs($expectedPath)->shouldBeCalledTimes(1);
        $this->image->getError()->willReturn('')->shouldBeCalledTimes(1);
        $this->assertEquals($expectedPath, $this->generator->generatePreview($url));
    }

    /**
     * @test
     * @expectedException \Shlinkio\Shlink\Common\Exception\PreviewGenerationException
     */
    public function errorWhileGeneratingPreviewThrowsException()
    {
        $url = 'http://foo.com';
        $cacheId = sprintf('preview_%s.png', urlencode($url));
        $expectedPath = 'dir/' . $cacheId;

        $this->filesystem->exists(sprintf('dir/preview_%s.png', urlencode($url)))->willReturn(false)
                                                                                 ->shouldBeCalledTimes(1);

        $this->image->saveAs($expectedPath)->shouldBeCalledTimes(1);
        $this->image->getError()->willReturn('Error!!')->shouldBeCalledTimes(1);

        $this->generator->generatePreview($url);
    }
}