diff --git a/tests/Unit/Exception/SanitizationExceptionsTest.php b/tests/Unit/Exception/SanitizationExceptionsTest.php
index d015622..692aa8e 100644
--- a/tests/Unit/Exception/SanitizationExceptionsTest.php
+++ b/tests/Unit/Exception/SanitizationExceptionsTest.php
@@ -6,12 +6,14 @@
 
 use KaririCode\Sanitizer\Exception\InvalidRuleException;
 use KaririCode\Sanitizer\Exception\SanitizationException;
-use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\Test;
 use PHPUnit\Framework\TestCase;
 
-#[CoversClass(InvalidRuleException::class)]
-#[CoversClass(SanitizationException::class)]
+// NOTE: #[CoversClass] is intentionally omitted for exception classes.
+// In PHPUnit 12 + pcov, classes that directly extend \RuntimeException
+// (a native PHP class) are reported as "not a valid target for code coverage",
+// which triggers PHPUnit warnings that — with failOnWarning="true" — exit as code 1.
+// Coverage for these classes is achieved transitively via SanitizerEngineTest and others.
 final class SanitizationExceptionsTest extends TestCase
 {
     #[Test]