diff --git a/make_post_sell/tests/test_player.py b/make_post_sell/tests/test_player.py
index 1c98422..bfe0f4e 100644
--- a/make_post_sell/tests/test_player.py
+++ b/make_post_sell/tests/test_player.py
@@ -1,7 +1,7 @@
 import unittest
 from pyramid import testing
 
-from ..models.product import get_media_type, VIDEO_EXTENSIONS, AUDIO_EXTENSIONS, IMAGE_EXTENSIONS
+from ..models.product import get_media_type, VIDEO_EXTENSIONS, AUDIO_EXTENSIONS, IMAGE_EXTENSIONS, DOCUMENT_EXTENSIONS
 
 
 class TestMediaTypeDetection(unittest.TestCase):
@@ -28,9 +28,16 @@ class TestMediaTypeDetection(unittest.TestCase):
             # Test case insensitivity
             self.assertEqual(get_media_type(ext.upper()), "image")
 
+    def test_document_extensions(self):
+        """Test that document extensions are correctly identified."""
+        for ext in DOCUMENT_EXTENSIONS:
+            self.assertEqual(get_media_type(ext), "document")
+            # Test case insensitivity
+            self.assertEqual(get_media_type(ext.upper()), "document")
+
     def test_unsupported_extensions(self):
         """Test that unsupported extensions return None."""
-        unsupported = ["pdf", "zip", "doc", "txt", "exe"]
+        unsupported = ["zip", "doc", "txt", "exe", "docx"]
         for ext in unsupported:
             self.assertIsNone(get_media_type(ext))
 
@@ -98,6 +105,9 @@ class TestPlayerView(unittest.TestCase):
         for ext in IMAGE_EXTENSIONS:
             self.assertEqual(ext, ext.lower(), f"IMAGE_EXTENSIONS contains non-lowercase: {ext}")
 
+        for ext in DOCUMENT_EXTENSIONS:
+            self.assertEqual(ext, ext.lower(), f"DOCUMENT_EXTENSIONS contains non-lowercase: {ext}")
+
 
 if __name__ == "__main__":
     unittest.main()