Docs: add testing guide + newsfragment 1727.docs.rst

docs/guide/testing.rst

@@ -0,0 +1,88 @@
+Testing your bot (pytest)
+=========================
+
+This guide shows how to test your handlers **without using the real Telegram API**.
+We will use `pytest` and `pytest-asyncio`.
+
+Installation::
+
+   pip install -U pytest pytest-asyncio
+
+Simple echo handler
+-------------------
+
+**Handler:**
+
+.. code-block:: python
+
+   # app/bot.py
+   from aiogram.types import Message
+
+   async def echo_handler(message: Message):
+       await message.answer(message.text)
+
+**Test:**
+
+.. code-block:: python
+
+   # tests/test_echo.py
+   import pytest
+   from app.bot import echo_handler
+
+   @pytest.mark.asyncio
+   async def test_echo_handler():
+       sent = []
+
+       class DummyMessage:
+           def __init__(self, text):
+               self.text = text
+           async def answer(self, text):
+               sent.append(text)
+
+       msg = DummyMessage("hello")
+       await echo_handler(msg)
+
+       assert sent == ["hello"]
+
+Callback query example
+----------------------
+
+**Handler:**
+
+.. code-block:: python
+
+   # app/callbacks.py
+   from aiogram.types import CallbackQuery
+
+   async def ping_pong(cb: CallbackQuery):
+       if cb.data == "ping":
+           await cb.message.edit_text("pong")
+           await cb.answer()
+
+**Test:**
+
+.. code-block:: python
+
+   # tests/test_callbacks.py
+   import pytest
+   from app.callbacks import ping_pong
+
+   @pytest.mark.asyncio
+   async def test_ping_pong():
+       calls = {"edited": None, "answered": False}
+
+       class DummyMsg:
+           async def edit_text(self, text):
+               calls["edited"] = text
+
+       class DummyCb:
+           data = "ping"
+           message = DummyMsg()
+           async def answer(self):
+               calls["answered"] = True
+
+       cb = DummyCb()
+       await ping_pong(cb)
+
+       assert calls["edited"] == "pong"
+       assert calls["answered"] is True

docs/index.rst

@@ -27,3 +27,4 @@ Contents
     utils/index
     changelog
     contributing
+    guide/testing