diff --git a/composer.json b/composer.json
index 1fd85f1..d205bb8 100644
--- a/composer.json
+++ b/composer.json
@@ -34,4 +34,4 @@
         "phpcsfixer": "vendor/bin/php-cs-fixer fix",
         "rector": "vendor/bin/rector"
     }
-}
+}
\ No newline at end of file
diff --git a/tests/ComposerReaderTestCase.php b/tests/ComposerReaderTestCase.php
index 6a1eeda..2c37997 100644
--- a/tests/ComposerReaderTestCase.php
+++ b/tests/ComposerReaderTestCase.php
@@ -1,9 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Nadar\PhpComposerReader\Tests;
 
 use PHPUnit\Framework\TestCase;
 
+error_reporting(E_ALL);
+
 class ComposerReaderTestCase extends TestCase
 {
     protected function getValidJson()