diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 76318df..2c6d6f4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,14 +1,14 @@
 name: build
 
-on: [push, pull_request]
+on: [ push, pull_request ]
 
 jobs:
   run:
     runs-on: ${{ matrix.operating-system }}
     strategy:
       matrix:
-        operating-system: [ubuntu-latest]
-        php-versions: ['7.4', '8.0', '8.1', '8.2']
+        operating-system: [ ubuntu-latest ]
+        php-versions: [ '7.4', '8.0', '8.1', '8.2' ]
     name: PHP ${{ matrix.php-versions }} Test on ${{ matrix.operating-system }}
 
     steps:
@@ -28,4 +28,7 @@ jobs:
       - name: Static analysis
         run: |
           composer require --dev phpstan/phpstan
-          vendor/bin/phpstan analyse -l 4 src tests
+          vendor/bin/phpstan analyse -l 6 src tests
+
+      - name: Run PHPUnit
+        run: vendor/bin/phpunit --verbose --colors=always tests
\ No newline at end of file
diff --git a/src/Models/VideoInfo.php b/src/Models/VideoInfo.php
index 36f74db..c1ad3e3 100644
--- a/src/Models/VideoInfo.php
+++ b/src/Models/VideoInfo.php
@@ -8,7 +8,7 @@
 class VideoInfo
 {
     // uniquely identifies this video
-    public ?string $id;
+    public ?string $id = null;
 
     public ?string $channelId = null;
     public ?string $channelTitle = null;
@@ -19,13 +19,13 @@ class VideoInfo
 
     public ?string $category;
 
-    public ?int $viewCount;
-    public ?int $commentCount;
-    public ?int $likeCount;
-    public ?int $dislikeCount;
+    public ?int $viewCount = null;
+    public ?int $commentCount = null;
+    public ?int $likeCount = null;
+    public ?int $dislikeCount = null;
 
     // in seconds
-    public ?int $durationSeconds;
+    public ?int $durationSeconds = null;
 
     // tags?
     public array $keywords = [];
diff --git a/src/Utils/Utils.php b/src/Utils/Utils.php
index 57a9e63..c793313 100644
--- a/src/Utils/Utils.php
+++ b/src/Utils/Utils.php
@@ -52,7 +52,7 @@ public static function extractChannel(string $url): ?string
      * @param mixed $default
      * @return mixed|null
      */
-    public static function arrayGet($array, string $key, $default = null)
+    public static function arrayGet(array $array, string $key, $default = null)
     {
         foreach (explode('.', $key) as $segment) {