Fix send_message not forwarding some args to send_file

tests/telethon/client/test_messages.py

@@ -0,0 +1,40 @@
+import inspect
+
+import pytest
+
+from telethon import TelegramClient
+
+
+@pytest.mark.asyncio
+async def test_send_message_with_file_forwards_args():
+    arguments = {}
+    sentinel = object()
+
+    for value, name in enumerate(inspect.signature(TelegramClient.send_message).parameters):
+        if name in {'self', 'entity', 'file'}:
+            continue  # positional
+
+        if name in {'message'}:
+            continue  # renamed
+
+        if name in {'link_preview'}:
+            continue  # make no sense in send_file
+
+        arguments[name] = value
+
+    class MockedClient(TelegramClient):
+        # noinspection PyMissingConstructor
+        def __init__(self):
+            pass
+
+        async def send_file(self, entity, file, **kwargs):
+            assert entity == 'a'
+            assert file == 'b'
+            for k, v in arguments.items():
+                assert k in kwargs
+                assert kwargs[k] == v
+
+            return sentinel
+
+    client = MockedClient()
+    assert (await client.send_message('a', file='b', **arguments)) == sentinel