1 files changed, 9 insertions, 0 deletions
diff --git a/tests/units/Helper/FileHelperText.php b/tests/units/Helper/FileHelperText.php
index 2c6bc6ad..6a1b78a4 100644
--- a/tests/units/Helper/FileHelperText.php
+++ b/tests/units/Helper/FileHelperText.php
@@ -24,4 +24,13 @@ class FileHelperTest extends Base
         $this->assertEquals('image/jpeg', $helper->getImageMimeType('My File.bmp'));
         $this->assertEquals('image/jpeg', $helper->getImageMimeType('My File'));
     }
+
+    public function testGetPreviewType()
+    {
+        $helper = new File($this->container);
+        $this->assertEquals('text', $helper->getPreviewType('test.txt'));
+        $this->assertEquals('markdown', $helper->getPreviewType('test.markdown'));
+        $this->assertEquals('md', $helper->getPreviewType('test.md'));
+        $this->assertEquals(null, $helper->getPreviewType('test.doc'));
+    }
 }