Added tests for Image classes

module/Common/src/Image/ImageFactory.php

@@ -27,7 +27,7 @@ class ImageFactory implements FactoryInterface
         $config = $container->get('config')['phpwkhtmltopdf'];
         $image = new Image(isset($config['images']) ? $config['images'] : null);
 
-        if (isset($options['url'])) {
+        if (isset($options) && isset($options['url'])) {
             $image->setPage($options['url']);
         }
 

module/Common/test/Image/ImageBuilderFactoryTest.php

@@ -0,0 +1,29 @@
+<?php
+namespace ShlinkioTest\Shlink\Common\Image;
+
+use PHPUnit_Framework_TestCase as TestCase;
+use Shlinkio\Shlink\Common\Image\ImageBuilder;
+use Shlinkio\Shlink\Common\Image\ImageBuilderFactory;
+use Zend\ServiceManager\ServiceManager;
+
+class ImageBuilderFactoryTest extends TestCase
+{
+    /**
+     * @var ImageBuilderFactory
+     */
+    protected $factory;
+
+    public function setUp()
+    {
+        $this->factory = new ImageBuilderFactory();
+    }
+
+    /**
+     * @test
+     */
+    public function serviceIsCreated()
+    {
+        $instance = $this->factory->__invoke(new ServiceManager(), '');
+        $this->assertInstanceOf(ImageBuilder::class, $instance);
+    }
+}

module/Common/test/Image/ImageFactoryTest.php

@@ -0,0 +1,56 @@
+<?php
+namespace ShlinkioTest\Shlink\Common\Image;
+
+use mikehaertl\wkhtmlto\Image;
+use PHPUnit_Framework_TestCase as TestCase;
+use Shlinkio\Shlink\Common\Image\ImageFactory;
+use Zend\ServiceManager\ServiceManager;
+
+class ImageFactoryTest extends TestCase
+{
+    /**
+     * @var ImageFactory
+     */
+    protected $factory;
+
+    public function setUp()
+    {
+        $this->factory = new ImageFactory();
+    }
+
+    /**
+     * @test
+     */
+    public function noPageIsSetWhenOptionsAreNotProvided()
+    {
+        /** @var Image $image */
+        $image = $this->factory->__invoke(new ServiceManager(['services' => [
+            'config' => ['phpwkhtmltopdf' => []],
+        ]]), '');
+        $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' => ['phpwkhtmltopdf' => []],
+        ]]), '', ['url' => $expectedPage]);
+        $this->assertInstanceOf(Image::class, $image);
+
+        $ref = new \ReflectionObject($image);
+        $page = $ref->getProperty('_page');
+        $page->setAccessible(true);
+        $this->assertEquals($expectedPage, $page->getValue($image));
+    }
+}