diff --git a/tests/CSSList/AtRuleBlockListTest.php b/tests/CSSList/AtRuleBlockListTest.php
index 73e6c38b..676b908a 100644
--- a/tests/CSSList/AtRuleBlockListTest.php
+++ b/tests/CSSList/AtRuleBlockListTest.php
@@ -5,10 +5,7 @@
 namespace Sabberworm\CSS\Tests\CSSList;
 
 use PHPUnit\Framework\TestCase;
-use Sabberworm\CSS\Comment\Commentable;
-use Sabberworm\CSS\CSSList\AtRuleBlockList;
 use Sabberworm\CSS\Parser;
-use Sabberworm\CSS\Renderable;
 use Sabberworm\CSS\Settings;
 
 /**
@@ -51,36 +48,6 @@ public static function provideSyntacticallyCorrectAtRule(): array
         ];
     }
 
-    /**
-     * @test
-     */
-    public function implementsAtRule(): void
-    {
-        $subject = new AtRuleBlockList('');
-
-        self::assertInstanceOf(AtRuleBlockList::class, $subject);
-    }
-
-    /**
-     * @test
-     */
-    public function implementsRenderable(): void
-    {
-        $subject = new AtRuleBlockList('');
-
-        self::assertInstanceOf(Renderable::class, $subject);
-    }
-
-    /**
-     * @test
-     */
-    public function implementsCommentable(): void
-    {
-        $subject = new AtRuleBlockList('');
-
-        self::assertInstanceOf(Commentable::class, $subject);
-    }
-
     /**
      * @test
      *
diff --git a/tests/Unit/CSSList/AtRuleBlockListTest.php b/tests/Unit/CSSList/AtRuleBlockListTest.php
new file mode 100644
index 00000000..b57e0525
--- /dev/null
+++ b/tests/Unit/CSSList/AtRuleBlockListTest.php
@@ -0,0 +1,46 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Sabberworm\CSS\Tests\Unit\CSSList;
+
+use PHPUnit\Framework\TestCase;
+use Sabberworm\CSS\Comment\Commentable;
+use Sabberworm\CSS\CSSList\AtRuleBlockList;
+use Sabberworm\CSS\Renderable;
+
+/**
+ * @covers \Sabberworm\CSS\CSSList\AtRuleBlockList
+ */
+final class AtRuleBlockListTest extends TestCase
+{
+    /**
+     * @test
+     */
+    public function implementsAtRule(): void
+    {
+        $subject = new AtRuleBlockList('');
+
+        self::assertInstanceOf(AtRuleBlockList::class, $subject);
+    }
+
+    /**
+     * @test
+     */
+    public function implementsRenderable(): void
+    {
+        $subject = new AtRuleBlockList('');
+
+        self::assertInstanceOf(Renderable::class, $subject);
+    }
+
+    /**
+     * @test
+     */
+    public function implementsCommentable(): void
+    {
+        $subject = new AtRuleBlockList('');
+
+        self::assertInstanceOf(Commentable::class, $subject);
+    }
+}