add type hint, tests, changes file

CHANGES/1117.feature.rst

@@ -0,0 +1 @@
+Added a method that allows you to compactly register routers

aiogram/dispatcher/router.py

@@ -179,7 +179,7 @@ class Router:
         self._parent_router = router
         router.sub_routers.append(self)
 
-    def include_routers(self, *routers):
+    def include_routers(self, *routers) -> Router:
         if not routers:
             raise ValueError("You must provide routers")
         for router in routers:

tests/test_dispatcher/test_router.py

@@ -33,6 +33,18 @@ class TestRouter:
         assert router3.parent_router is router2
         assert router3.sub_routers == []
 
+    def test_including_many_routers(self):
+        router = Router()
+        router1 = Router()
+        router2 = Router()
+
+        with pytest.raises(ValueError, match="You must provide routers"):
+            router.include_routers()
+
+        router.include_routers(router1, router2)
+
+        assert router.sub_routers == [router1, router2]
+
     def test_include_router_by_string_bad_type(self):
         router = Router()
         with pytest.raises(ValueError, match=r"router should be instance of Router"):