Beta 3 (#884)

* Rework middlewares, separate management to `MiddlewareManager` class

* Rework middlewares

* Added changes description for redis

* Added changes description for redis

* Fixed tests with Redis // aioredis replacement

* Changed msg.<html/md>_text attributes behaviour

* Added changelog for spoilers

* Added possibility to get command magic result as handler arguments

tests/test_dispatcher/test_event/test_middleware.py

@@ -0,0 +1,42 @@
+from functools import partial
+
+from aiogram.dispatcher.middlewares.manager import MiddlewareManager
+
+
+class TestMiddlewareManager:
+    async def test_register(self):
+        manager = MiddlewareManager()
+
+        @manager
+        async def middleware(handler, event, data):
+            await handler(event, data)
+
+        assert middleware in manager._middlewares
+        manager.unregister(middleware)
+        assert middleware not in manager._middlewares
+
+    async def test_wrap_middlewares(self):
+        manager = MiddlewareManager()
+
+        async def target(*args, **kwargs):
+            kwargs["target"] = True
+            kwargs["stack"].append(-1)
+            return kwargs
+
+        async def middleware1(handler, event, data):
+            data["mw1"] = True
+            data["stack"].append(1)
+            return await handler(event, data)
+
+        async def middleware2(handler, event, data):
+            data["mw2"] = True
+            data["stack"].append(2)
+            return await handler(event, data)
+
+        wrapped = manager.wrap_middlewares([middleware1, middleware2], target)
+
+        assert isinstance(wrapped, partial)
+        assert wrapped.func is middleware1
+
+        result = await wrapped(None, {"stack": []})
+        assert result == {"mw1": True, "mw2": True, "target": True, "stack": [1, 2, -1]}