diff --git a/tests/unit/API/Endpoints/NewslettersTest.php b/tests/unit/API/Endpoints/NewslettersTest.php
index 690727f8d8..59d6b2aca3 100644
--- a/tests/unit/API/Endpoints/NewslettersTest.php
+++ b/tests/unit/API/Endpoints/NewslettersTest.php
@@ -8,6 +8,8 @@ use MailPoet\Models\NewsletterOptionField;
 use MailPoet\Models\NewsletterSegment;
 use MailPoet\Models\Segment;
 use MailPoet\Newsletter\Scheduler\Scheduler;
+use MailPoet\Newsletter\Url;
+use MailPoet\Router\Router;
 
 class NewslettersTest extends MailPoetTest {
   function _before() {
@@ -29,7 +31,7 @@ class NewslettersTest extends MailPoetTest {
   function testItCanGetANewsletter() {
     $router = new Newsletters();
 
-    $response = $router->get(/* missing id */);
+    $response = $router->get(); // missing id
     expect($response->status)->equals(APIResponse::STATUS_NOT_FOUND);
     expect($response->errors[0]['message'])
       ->equals('This newsletter does not exist.');
@@ -517,7 +519,7 @@ class NewslettersTest extends MailPoetTest {
     expect($response->status)->equals(APIResponse::STATUS_OK);
   }
 
-  function testItReturnsMaillerErrorWhenSendingFailed() {
+  function testItReturnsMailerErrorWhenSendingFailed() {
     $subscriber = 'test@subscriber.com';
     $data = array(
       'subscriber' => $subscriber,
@@ -542,6 +544,18 @@ class NewslettersTest extends MailPoetTest {
     expect($response->errors[0]['message'])->equals('The email could not be sent: failed');
   }
 
+  function testItGeneratesPreviewLinksWithNewsletterHashAndNoSubscriberData() {
+    $router = new Newsletters();
+    $response = $router->listing();
+    $preview_link = $response->data[0]['preview_url'];
+    parse_str(parse_url($preview_link, PHP_URL_QUERY), $preview_link_data);
+    $preview_link_data = Url::transformUrlDataObject(Router::decodeRequestData($preview_link_data['data']));
+    expect($preview_link_data['newsletter_hash'])->notEmpty();
+    expect($preview_link_data['subscriber_id'])->false();
+    expect($preview_link_data['subscriber_token'])->false();
+    expect((boolean)$preview_link_data['preview'])->true();
+  }
+
   function _after() {
     Newsletter::deleteMany();
     NewsletterSegment::deleteMany();
diff --git a/tests/unit/Router/Endpoints/ViewInBrowserTest.php b/tests/unit/Router/Endpoints/ViewInBrowserTest.php
index a6cb5da8be..1484887cc2 100644
--- a/tests/unit/Router/Endpoints/ViewInBrowserTest.php
+++ b/tests/unit/Router/Endpoints/ViewInBrowserTest.php
@@ -143,6 +143,21 @@ class ViewInBrowserRouterTest extends MailPoetTest {
     expect($this->view_in_browser->_validateBrowserPreviewData($data))->equals($data);
   }
 
+  function testItSetsSubscriberToLoggedInWPUserWhenPreviewIsEnabled() {
+    $data = (object)array_merge(
+      $this->browser_preview_data,
+      array(
+        'queue' => $this->queue,
+        'subscriber' => null,
+        'newsletter' => $this->newsletter
+      )
+    );
+    $data->preview = true;
+    wp_set_current_user(1);
+    $result = $this->view_in_browser->_validateBrowserPreviewData($data);
+    expect($result->subscriber->id)->equals(1);
+  }
+
   function testItProcessesBrowserPreviewData() {
     $processed_data = $this->view_in_browser->_processBrowserPreviewData($this->browser_preview_data);
     expect($processed_data->queue->id)->equals($this->queue->id);