Issue #3309640 by jsacksick: Sending a test email breaks if the test context is not set.

src/Form/TestEmailForm.php

@@ -4,6 +4,7 @@ namespace Drupal\commerce_email\Form;
 
 use Drupal\commerce_email\EmailSenderInterface;
 use Drupal\commerce_email\Entity\EmailInterface;
+use Drupal\Core\Entity\EntityTypeBundleInfoInterface;
 use Drupal\Core\Entity\EntityTypeManagerInterface;
 use Drupal\Core\Form\FormBase;
 use Drupal\Core\Form\FormStateInterface;
@@ -28,22 +29,31 @@ class TestEmailForm extends FormBase {
    */
   protected $entityTypeManager;
 
+  /**
+   * The entity type bundle info service.
+   *
+   * @var \Drupal\Core\Entity\EntityTypeBundleInfoInterface
+   */
+  protected $entityTypeBundleInfo;
+
   /**
    * {@inheritdoc}
    */
   public static function create(ContainerInterface $container) {
     return new static(
       $container->get('commerce_email.email_sender'),
-      $container->get('entity_type.manager')
+      $container->get('entity_type.manager'),
+      $container->get('entity_type.bundle.info')
     );
   }
 
   /**
    * {@inheritdoc}
    */
-  public function __construct(EmailSenderInterface $email_sender, EntityTypeManagerInterface $entity_type_manager) {
+  public function __construct(EmailSenderInterface $email_sender, EntityTypeManagerInterface $entity_type_manager, EntityTypeBundleInfoInterface $entity_type_bundle_info) {
     $this->emailSender = $email_sender;
     $this->entityTypeManager = $entity_type_manager;
+    $this->entityTypeBundleInfo = $entity_type_bundle_info;
   }
 
   /**
@@ -176,10 +186,18 @@ class TestEmailForm extends FormBase {
     $commerce_email->setSubject($values['subject']);
     $commerce_email->setBody($values['body']);
 
+    $entity_storage = $this->entityTypeManager->getStorage($commerce_email->getTargetEntityTypeId());
+    // If a target entity wasn't specified, generate a sample entity.
+    if (!$form_state->getValue('target_entity')) {
+      $bundle_ids = $this->entityTypeBundleInfo->getBundleInfo($commerce_email->getTargetEntityTypeId());
+      $random_bundle = array_rand($bundle_ids);
+      $entity = $entity_storage->createWithSampleValues($random_bundle);
+    }
+    else {
+      $entity = $entity_storage->load($form_state->getValue('target_entity'));
+    }
     // Send the email using the referenced entity.
-    /** @var \Drupal\Core\Entity\ContentEntityInterface $entity */
-    $entity = $this->entityTypeManager->getStorage($commerce_email->getTargetEntityTypeId())->load($form_state->getValue('target_entity'));
-    $this->emailSender->send($commerce_email, $entity, []);
+    $this->emailSender->send($commerce_email, $entity);
 
     $this->messenger()->addMessage($this->t('Test email sent.'));
   }