diff --git a/tests/test_fastapi_extension.py b/tests/test_fastapi_extension.py
index 32225c0..4f2b666 100644
--- a/tests/test_fastapi_extension.py
+++ b/tests/test_fastapi_extension.py
@@ -300,11 +300,19 @@ class TestDecorators(TestSlowapi):
         async def t1(request: Request):
             return PlainTextResponse("test")
 
+        @app.get("/t2")
+        @limiter.limit("50/minute", cost=15)
+        async def t2(request: Request):
+            return PlainTextResponse("test")
+
         client = TestClient(app)
         for i in range(0, 10):
             response = client.get("/t1")
             assert response.status_code == 200 if i < 5 else 429
 
+            response = client.get("/t2")
+            assert response.status_code == 200 if i < 3 else 429
+
     def test_callable_cost(self):
         app, limiter = self.build_fastapi_app(key_func=get_ipaddr)
 
@@ -313,7 +321,17 @@ class TestDecorators(TestSlowapi):
         async def t1(request: Request):
             return PlainTextResponse("test")
 
+        @app.get("/t2")
+        @limiter.limit(
+            "50/minute", cost=lambda request: int(request.headers["foo"]) * 1.5
+        )
+        async def t2(request: Request):
+            return PlainTextResponse("test")
+
         client = TestClient(app)
         for i in range(0, 10):
             response = client.get("/t1", headers={"foo": "10"})
             assert response.status_code == 200 if i < 5 else 429
+
+            response = client.get("/t2", headers={"foo": "5"})
+            assert response.status_code == 200 if i < 6 else 429
diff --git a/tests/test_starlette_extension.py b/tests/test_starlette_extension.py
index c02eb48..39058ad 100644
--- a/tests/test_starlette_extension.py
+++ b/tests/test_starlette_extension.py
@@ -269,12 +269,27 @@ class TestDecorators(TestSlowapi):
 
         app.add_route("/t1", t1)
 
+        @limiter.limit("50/minute", cost=15)
+        async def t2(request: Request):
+            return PlainTextResponse("test")
+
+        app.add_route("/t2", t2)
+
         client = TestClient(app)
         for i in range(0, 10):
             response = client.get("/t1")
             assert response.status_code == 200 if i < 5 else 429
             if i < 5:
                 assert response.text == "test"
+            else:
+                assert "error" in response.json()
+
+            response = client.get("/t2")
+            assert response.status_code == 200 if i < 3 else 429
+            if i < 3:
+                assert response.text == "test"
+            else:
+                assert "error" in response.json()
 
     def test_callable_cost(self):
         app, limiter = self.build_starlette_app(key_func=get_ipaddr)
@@ -285,9 +300,26 @@ class TestDecorators(TestSlowapi):
 
         app.add_route("/t1", t1)
 
+        @limiter.limit(
+            "50/minute", cost=lambda request: int(request.headers["foo"]) * 1.5
+        )
+        async def t2(request: Request):
+            return PlainTextResponse("test")
+
+        app.add_route("/t2", t2)
+
         client = TestClient(app)
         for i in range(0, 10):
             response = client.get("/t1", headers={"foo": "10"})
             assert response.status_code == 200 if i < 5 else 429
             if i < 5:
                 assert response.text == "test"
+            else:
+                assert "error" in response.json()
+
+            response = client.get("/t2", headers={"foo": "5"})
+            assert response.status_code == 200 if i < 6 else 429
+            if i < 6:
+                assert response.text == "test"
+            else:
+                assert "error" in response.json()