diff --git a/tests/Unit/CSSList/AtRuleBlockListTest.php b/tests/Unit/CSSList/AtRuleBlockListTest.php
index b57e0525..30a7f305 100644
--- a/tests/Unit/CSSList/AtRuleBlockListTest.php
+++ b/tests/Unit/CSSList/AtRuleBlockListTest.php
@@ -11,6 +11,8 @@
 
 /**
  * @covers \Sabberworm\CSS\CSSList\AtRuleBlockList
+ * @covers \Sabberworm\CSS\CSSList\CSSBlockList
+ * @covers \Sabberworm\CSS\CSSList\CSSList
  */
 final class AtRuleBlockListTest extends TestCase
 {
@@ -43,4 +45,70 @@ public function implementsCommentable(): void
 
         self::assertInstanceOf(Commentable::class, $subject);
     }
+
+    /**
+     * @test
+     */
+    public function atRuleNameReturnsTypeProvidedToConstructor(): void
+    {
+        $type = 'foo';
+
+        $subject = new AtRuleBlockList($type);
+
+        self::assertSame($type, $subject->atRuleName());
+    }
+
+    /**
+     * @test
+     */
+    public function getLineNoByDefaultReturnsZero(): void
+    {
+        $subject = new AtRuleBlockList('');
+
+        self::assertSame(0, $subject->getLineNo());
+    }
+
+    /**
+     * @test
+     */
+    public function atRuleArgsByDefaultReturnsEmptyString(): void
+    {
+        $subject = new AtRuleBlockList('');
+
+        self::assertSame('', $subject->atRuleArgs());
+    }
+
+    /**
+     * @test
+     */
+    public function atRuleArgsReturnsArgumentsProvidedToConstructor(): void
+    {
+        $arguments = 'bar';
+
+        $subject = new AtRuleBlockList('', $arguments);
+
+        self::assertSame($arguments, $subject->atRuleArgs());
+    }
+
+    /**
+     * @test
+     */
+    public function getLineNoReturnsLineNumberProvidedToConstructor(): void
+    {
+        $lineNumber = 42;
+
+        $subject = new AtRuleBlockList('', '', $lineNumber);
+
+        self::assertSame($lineNumber, $subject->getLineNo());
+    }
+
+    /**
+     * @test
+     */
+    public function isRootListAlwaysReturnsFalse(): void
+    {
+        $subject = new AtRuleBlockList('');
+
+        self::assertFalse($subject->isRootList());
+    }
 }