Throw specific error if file is found to be empty

src/Twig/Runtime/IconRuntime.php

@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace Pcm\IconBundle\Twig\Runtime;
 
 use Pcm\IconBundle\Exception\ColourNotFound;
+use Pcm\IconBundle\Exception\EmptyFileException;
 use Pcm\IconBundle\Exception\IconNotFound;
 use Twig\Extension\RuntimeExtensionInterface;
 
@@ -44,6 +45,10 @@ final class IconRuntime implements RuntimeExtensionInterface
 
         $svg = $this->getSvg($options['icon']);
 
+        if (empty($svg)) {
+            throw new EmptyFileException(\sprintf("The file %s.svg was found, but it was empty!", $options['icon']));
+        }
+
         $this->sanitiseSvg($svg);
 
         $colourClasses = $this->getColourClasses($options['colour'], $options['hover']);

tests/Twig/Runtime/IconRuntimeTest.php

@@ -6,6 +6,7 @@ namespace Pcm\IconBundle\Tests\Twig\Functions;
 
 use Pcm\IconBundle\DependencyInjection\Configuration;
 use Pcm\IconBundle\Exception\ColourNotFound;
+use Pcm\IconBundle\Exception\EmptyFileException;
 use Pcm\IconBundle\Exception\IconNotFound;
 use Pcm\IconBundle\Twig\Runtime\IconRuntime;
 use PHPUnit\Framework\TestCase;
@@ -50,6 +51,12 @@ class IconRuntimeTest extends TestCase
         $this->icon->renderIcon(['icon' => random_bytes(8)]);
     }
 
+    public function testThrowsIfPassedInAnEmptyFile(): void
+    {
+        $this->expectException(EmptyFileException::class);
+        $this->icon->renderIcon(['icon' => 'empty']);
+    }
+
     public function testNoTitleExistsIfNotPassedIn(): void
     {
         $content = $this->icon->renderIcon(['icon' => self::ICON]);