diff --git a/tests/bot/exts/filtering/test_extension_filter.py b/tests/bot/exts/filtering/test_extension_filter.py
index 67a503b306..e2a0f70ccb 100644
--- a/tests/bot/exts/filtering/test_extension_filter.py
+++ b/tests/bot/exts/filtering/test_extension_filter.py
@@ -6,7 +6,7 @@
 from bot.constants import Channels
 from bot.exts.filtering._filter_context import Event, FilterContext
 from bot.exts.filtering._filter_lists import extension
-from bot.exts.filtering._filter_lists.extension import ExtensionsList
+from bot.exts.filtering._filter_lists.extension import ExtensionsList, PY_EMBED_DESCRIPTION, TXT_EMBED_DESCRIPTION
 from bot.exts.filtering._filter_lists.filter_list import ListType
 from tests.helpers import MockAttachment, MockBot, MockMember, MockMessage, MockTextChannel
 
@@ -24,9 +24,15 @@ def setUp(self):
         self.whitelist = [".first", ".second", ".third"]
         for i, filter_content in enumerate(self.whitelist, start=1):
             filters.append({
-                "id": i, "content": filter_content, "description": None, "settings": {},
-                "additional_settings": {}, "created_at": now, "updated_at": now
+                "id": i,
+                "content": filter_content,
+                "description": None,
+                "settings": {},
+                "additional_settings": {},
+                "created_at": now,
+                "updated_at": now
             })
+        # Add the ALLOW list (id=1 => ListType.ALLOW)
         self.filter_list.add_list({
             "id": 1,
             "list_type": 1,
@@ -103,3 +109,55 @@ async def test_get_disallowed_extensions(self):
                 ctx = self.ctx.replace(attachments=[MockAttachment(filename=f"filename{ext}") for ext in extensions])
                 result = await self.filter_list.actions_for(ctx)
                 self.assertCountEqual(result[1], expected_disallowed_extensions)
+
+    @patch("bot.instance", BOT)
+    async def test_disallowed_py_extension_sets_py_embed(self):
+        """A .py file that's not in the ALLOW list should trigger PY_EMBED_DESCRIPTION."""
+        attachment = MockAttachment(filename="script.py")
+        ctx = self.ctx.replace(attachments=[attachment])
+
+        actions, blocked_exts, triggered_filters = await self.filter_list.actions_for(ctx)
+
+        self.assertEqual(ctx.dm_embed, PY_EMBED_DESCRIPTION, "Expected the PY_EMBED_DESCRIPTION for disallowed .py")
+        # Typically, disallowed extension -> non-empty blocked_exts, no ALLOW filters triggered
+        self.assertIn("`.py`", blocked_exts, "Blocked extensions should include `.py`")
+        self.assertEqual(triggered_filters[ListType.ALLOW], [], "No ALLOW filters should match a .py extension")
+
+
+    @patch("bot.instance", BOT)
+    async def test_disallowed_txt_extension_sets_txt_embed(self):
+        """A .txt file that's not whitelisted should trigger TXT_EMBED_DESCRIPTION."""
+        attachment = MockAttachment(filename="notes.txt")
+        ctx = self.ctx.replace(attachments=[attachment])
+
+        actions, blocked_exts, triggered_filters = await self.filter_list.actions_for(ctx)
+
+        self.assertEqual(ctx.dm_embed, TXT_EMBED_DESCRIPTION.format(blocked_extension=".txt"),
+                         "Expected the TXT_EMBED_DESCRIPTION for disallowed text-like file")
+        self.assertIn("`.txt`", blocked_exts, "Blocked extensions should include `.txt`")
+        self.assertEqual(triggered_filters[ListType.ALLOW], [], "No ALLOW filters should match .txt if it's unlisted")
+
+    @patch("bot.instance", BOT)
+    async def test_snekbox_textlike_file_not_blocked(self):
+        """
+        In SNEKBOX mode, text-like attachments (e.g., .txt) aren't blocked,
+        so no embed should be set and the result should show no blocked extensions.
+        """
+        attachment = MockAttachment(filename="script.txt")
+        snekbox_ctx = self.ctx.replace(event=Event.SNEKBOX, attachments=[attachment])
+
+        actions, blocked_exts, triggered_filters = await self.filter_list.actions_for(snekbox_ctx)
+
+        self.assertEqual(snekbox_ctx.dm_embed, "", "Should not set a DM embed for text-like file in SNEKBOX mode.")
+        self.assertEqual(actions, None, "No blocking actions for .txt in SNEKBOX.")
+        self.assertEqual(blocked_exts, [], "No blocked extensions in SNEKBOX for text-like files.")
+        self.assertIn(ListType.ALLOW, triggered_filters, "We at least check the allow list, even if empty.")
+
+    @patch("bot.instance", BOT)
+    async def test_no_message_object_returns_early(self):
+        """If ctx.message is None, the function should return (None, [], {}) immediately."""
+        no_msg_ctx = self.ctx.replace(message=None)
+
+        result = await self.filter_list.actions_for(no_msg_ctx)
+
+        self.assertEqual(result, (None, [], {}), "Expected early return if ctx.message is None.")