diff --git a/tests/php/Extensions/FolderFormFactoryExtensionTest.php b/tests/php/Extensions/FolderFormFactoryExtensionTest.php
new file mode 100644
index 00000000..ebb55740
--- /dev/null
+++ b/tests/php/Extensions/FolderFormFactoryExtensionTest.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace SilverStripe\Subsites\Tests\Extensions;
+
+use SilverStripe\AssetAdmin\Forms\FolderFormFactory;
+use SilverStripe\Assets\Folder;
+use SilverStripe\Dev\SapphireTest;
+use SilverStripe\Forms\Form;
+use SilverStripe\Forms\FormFactory;
+
+class FolderFormFactoryExtensionTest extends SapphireTest
+{
+    protected static $fixture_file = 'FolderFormFactoryExtensionTest.yml';
+
+    public function testSubsitesFolderDropdown()
+    {
+        $this->logInWithPermission('ADMIN');
+
+        /** @var Folder $folder */
+        $folder = $this->objFromFixture(Folder::class, 'folder_a');
+
+        /** @var Form $folderForm */
+        $folderForm = FolderFormFactory::create()->getForm(null, FormFactory::DEFAULT_NAME, [
+            'Record' => $folder
+        ]);
+
+        $source = array_values($folderForm->Fields()->fieldByName('SubsiteID')->getSource());
+        $result = array_values($source);
+
+        $this->assertContains('Main site', $result);
+        $this->assertContains('Subsite A', $result);
+        $this->assertContains('Subsite B', $result);
+    }
+}
diff --git a/tests/php/Extensions/FolderFormFactoryExtensionTest.yml b/tests/php/Extensions/FolderFormFactoryExtensionTest.yml
new file mode 100644
index 00000000..369c1994
--- /dev/null
+++ b/tests/php/Extensions/FolderFormFactoryExtensionTest.yml
@@ -0,0 +1,11 @@
+SilverStripe\Subsites\Model\Subsite:
+  main:
+    Title: Template
+  subsite_a:
+    Title: Subsite A
+  subsite_b:
+    Title: Subsite B
+
+SilverStripe\Assets\Folder:
+  folder_a:
+    Title: Folder A
diff --git a/tests/php/FileSubsitesTest.php b/tests/php/FileSubsitesTest.php
index c59839e5..b3484faf 100644
--- a/tests/php/FileSubsitesTest.php
+++ b/tests/php/FileSubsitesTest.php
@@ -12,15 +12,6 @@ class FileSubsitesTest extends BaseSubsiteTest
 {
     protected static $fixture_file = 'SubsiteTest.yml';
 
-    /**
-     * Disable other file extensions
-     *
-     * @var array
-     */
-    protected static $illegal_extensions = [
-        SiteTree::class => ['Translatable'], // @todo implement namespace for Translatable
-    ];
-
     public function testTrivialFeatures()
     {
         $this->assertTrue(is_array(singleton(FileSubsites::class)->extraStatics()));
@@ -73,27 +64,4 @@ public function testWritingSubsiteID()
         $file->onAfterUpload();
         $this->assertEquals($folder->SubsiteID, $file->SubsiteID);
     }
-
-    public function testSubsitesFolderDropdown()
-    {
-        $this->logInAs('admin');
-
-        $file = new Folder();
-
-        $source = array_values($file->getCMSFields()->dataFieldByName('SubsiteID')->getSource());
-        asort($source);
-
-        $this->assertEquals([
-            'Main site',
-            'Subsite1 Template',
-            'Subsite2 Template',
-            'Template',
-            'Test 1',
-            'Test 2',
-            'Test 3',
-            'Test Non-SSL',
-            'Test SSL',
-            'Test Vagrant VM on port 8080'
-        ], array_values($source));
-    }
 }