Don't add a CTA if an emails contains a P.S.

Don't automatically add a CTA to a daily email if the email body text
already contains a "P.S.".

modules/opd_daily_emails/tests/src/Functional/CallToActionTest.php

@@ -46,4 +46,17 @@ final class CallToActionTest extends ExistingSiteBase {
     );
   }
 
+  public function test_cta_in_body_prevents_automatically_adding_a_cta(): void {
+    $email = $this->createNode([
+      'body' => [
+        'format' => 'basic_html',
+        'value' => 'P.S. This email already contains a CTA.',
+      ],
+      'field_daily_email_cta' => NULL,
+      'type' => 'daily_email',
+    ]);
+
+    $this->assertEmpty($email->get('field_daily_email_cta'));
+  }
+
 }