symfony
diff --git a/‎src/Symfony/Component/Mailer/Bridge/Sendgrid/Tests/Transport/SendgridApiTransportTest.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Mailer/Bridge/Sendgrid/Tests/Transport/SendgridApiTransportTest.php
+4Lines changed: 4 additions & 0 deletions b/‎src/Symfony/Component/Mailer/Bridge/Sendgrid/Tests/Transport/SendgridApiTransportTest.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Mailer/Bridge/Sendgrid/Tests/Transport/SendgridApiTransportTest.php
+4Lines changed: 4 additions & 0 deletions
@@ -227,6 +227,10 @@ public function testEnvelopeSenderAndRecipients()
 
     public function testTagAndMetadataHeaders()
     {
+        if (!class_exists(TagHeader::class)) {
+            $this->markTestSkipped('This test requires symfony/mailer 5.1 or higher.');
+        }
+
         $email = new Email();
         $email->getHeaders()->add(new TagHeader('category-one'));
         $email->getHeaders()->add(new MetadataHeader('Color', 'blue'));