diff --git a/tests/test_include_duplicate_path_route.py b/tests/test_include_duplicate_path_route.py
index ca191ffdd..676133bc4 100644
--- a/tests/test_include_duplicate_path_route.py
+++ b/tests/test_include_duplicate_path_route.py
@@ -9,11 +9,11 @@ def test_app_router_with_duplicate_path():
 
         @app.get("/items/")
         def read_items():
-            return
+            return  # pragma: no cover
 
         @app.get("/items/")
         def read_items2():
-            return
+            return  # pragma: no cover
 
 
 def test_sub_with_duplicate_path():
@@ -23,13 +23,13 @@ def test_sub_with_duplicate_path():
 
         @router.get("/items/")
         def read_items():
-            return
+            return  # pragma: no cover
 
         @router.get("/items/")
         def read_items2():
-            return
+            return  # pragma: no cover
 
-        app.include_router(router)
+        app.include_router(router)  # pragma: no cover
 
 
 def test_mix_app_sub_with_duplicate_path():
@@ -39,13 +39,13 @@ def test_mix_app_sub_with_duplicate_path():
 
         @app.get("/items/")
         def read_items():
-            return
+            return  # pragma: no cover
 
         @router.get("/items/")
         def read_items2():
-            return
+            return  # pragma: no cover
 
-        app.include_router(router)
+        app.include_router(router)  # pragma: no cover
 
 
 def test_sub_route_direct_duplicate_path():
@@ -55,13 +55,13 @@ def test_sub_route_direct_duplicate_path():
 
         @router.route("/items/")
         def read_items():
-            return
+            return  # pragma: no cover
 
         @router.route("/items/")
         def read_items2():
-            return
+            return  # pragma: no cover
 
-        app.include_router(router)
+        app.include_router(router)  # pragma: no cover
 
 
 def test_app_router_with_duplicate_path_different_method():
@@ -69,11 +69,11 @@ def test_app_router_with_duplicate_path_different_method():
 
     @app.get("/items/")
     def read_items():
-        return
+        return  # pragma: no cover
 
     @app.post("/items/")
     def read_items2():
-        return
+        return  # pragma: no cover
 
 
 def test_sub_with_duplicate_path_different_method():
@@ -82,13 +82,13 @@ def test_sub_with_duplicate_path_different_method():
 
     @router.get("/items/")
     def read_items():
-        return
+        return  # pragma: no cover
 
     @router.post("/items/")
     def read_items2():
-        return
+        return  # pragma: no cover
 
-    app.include_router(router)
+    app.include_router(router)  # pragma: no cover
 
 
 def test_mix_app_sub_with_duplicate_different_method():
@@ -97,13 +97,13 @@ def test_mix_app_sub_with_duplicate_different_method():
 
     @app.get("/items/")
     def read_items():
-        return
+        return  # pragma: no cover
 
     @router.post("/items/")
     def read_items2():
-        return
+        return  # pragma: no cover
 
-    app.include_router(router)
+    app.include_router(router)  # pragma: no cover
 
 
 def test_sub_route_direct_duplicate_path_different_method():
@@ -112,10 +112,40 @@ def test_sub_route_direct_duplicate_path_different_method():
 
     @router.route("/items/")
     def read_items():
-        return
+        return  # pragma: no cover
 
     @router.route("/items/", methods=["POST"])
     def read_items2():
-        return
+        return  # pragma: no cover
+
+    app.include_router(router)  # pragma: no cover
+
+
+def test_app_websocket_route_with_duplicate_path():
+    with pytest.raises(RouteAlreadyExistsError):
+        app = FastAPI()
+
+        @app.websocket("/items/")
+        def read_items():
+            return  # pragma: no cover
+
+        @app.websocket("/items/")
+        def read_items2():
+            return  # pragma: no cover
+
+
+def test_sub_with_duplicate_path_with_prefix():
+    with pytest.raises(RouteAlreadyExistsError):
+        app = FastAPI()
+        router = APIRouter()
+
+        @router.get("/items/")
+        def read_items():
+            return  # pragma: no cover
+
+        @router.get("/items/")
+        def read_items2():
+            return  # pragma: no cover
+
+        app.include_router(router, prefix="/prefix")  # pragma: no cover
 
-    app.include_router(router)