Created PreviewGenerator module

module/PreviewGenerator/test/Image/ImageBuilderFactoryTest.php

@@ -0,0 +1,27 @@
+<?php
+declare(strict_types=1);
+
+namespace ShlinkioTest\Shlink\PreviewGenerator\Image;
+
+use PHPUnit\Framework\TestCase;
+use Shlinkio\Shlink\PreviewGenerator\Image\ImageBuilder;
+use Shlinkio\Shlink\PreviewGenerator\Image\ImageBuilderFactory;
+use Zend\ServiceManager\ServiceManager;
+
+class ImageBuilderFactoryTest extends TestCase
+{
+    /** @var ImageBuilderFactory */
+    private $factory;
+
+    public function setUp(): void
+    {
+        $this->factory = new ImageBuilderFactory();
+    }
+
+    /** @test */
+    public function serviceIsCreated()
+    {
+        $instance = $this->factory->__invoke(new ServiceManager(), '');
+        $this->assertInstanceOf(ImageBuilder::class, $instance);
+    }
+}

module/PreviewGenerator/test/Image/ImageFactoryTest.php

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+<?php
+declare(strict_types=1);
+
+namespace ShlinkioTest\Shlink\PreviewGenerator\Image;
+
+use mikehaertl\wkhtmlto\Image;
+use PHPUnit\Framework\TestCase;
+use ReflectionObject;
+use Shlinkio\Shlink\PreviewGenerator\Image\ImageFactory;
+use Zend\ServiceManager\ServiceManager;
+
+class ImageFactoryTest extends TestCase
+{
+    /** @var ImageFactory */
+    private $factory;
+
+    public function setUp(): void
+    {
+        $this->factory = new ImageFactory();
+    }
+
+    /** @test */
+    public function noPageIsSetWhenOptionsAreNotProvided()
+    {
+        /** @var Image $image */
+        $image = $this->factory->__invoke(new ServiceManager(['services' => [
+            'config' => ['wkhtmltopdf' => []],
+        ]]), '');
+        $this->assertInstanceOf(Image::class, $image);
+
+        $ref = new ReflectionObject($image);
+        $page = $ref->getProperty('_page');
+        $page->setAccessible(true);
+        $this->assertNull($page->getValue($image));
+    }
+
+    /** @test */
+    public function aPageIsSetWhenOptionsIncludeTheUrl()
+    {
+        $expectedPage = 'foo/bar.html';
+
+        /** @var Image $image */
+        $image = $this->factory->__invoke(new ServiceManager(['services' => [
+            'config' => ['wkhtmltopdf' => []],
+        ]]), '', ['url' => $expectedPage]);
+        $this->assertInstanceOf(Image::class, $image);
+
+        $ref = new ReflectionObject($image);
+        $page = $ref->getProperty('_page');
+        $page->setAccessible(true);
+        $this->assertEquals($expectedPage, $page->getValue($image));
+    }
+}