diff --git a/tests/endpoints/__init__.py b/tests/endpoints/__init__.py
deleted file mode 100644
index e69de29bb..000000000
diff --git a/tests/endpoints/a.py b/tests/endpoints/a.py
deleted file mode 100644
index 19a1b18cc..000000000
--- a/tests/endpoints/a.py
+++ /dev/null
@@ -1,13 +0,0 @@
-from fastapi import APIRouter
-
-router = APIRouter()
-
-
-@router.get("/dog")
-def get_a_dog():
-    return "Woof"
-
-
-@router.get("/cat")
-def get_a_cat():
-    return "Meow"
diff --git a/tests/endpoints/b.py b/tests/endpoints/b.py
deleted file mode 100644
index 9105a7144..000000000
--- a/tests/endpoints/b.py
+++ /dev/null
@@ -1,13 +0,0 @@
-from fastapi import APIRouter
-
-router = APIRouter()
-
-
-@router.get("/dog")
-def get_b_dog():
-    return "B Woof"
-
-
-@router.get("/cat")
-def get_b_cat():
-    return "B Meow"
diff --git a/tests/test_application.py b/tests/test_application.py
index e0bf9f11b..55394c19d 100644
--- a/tests/test_application.py
+++ b/tests/test_application.py
@@ -1147,10 +1147,12 @@ def test_get_path(path, expected_status, expected_response):
 def test_swagger_ui():
     response = client.get("/docs")
     assert response.status_code == 200
+    assert response.headers["content-type"] == "text/html; charset=utf-8"
     assert "swagger-ui-dist" in response.text
 
 
 def test_redoc():
     response = client.get("/redoc")
     assert response.status_code == 200
+    assert response.headers["content-type"] == "text/html; charset=utf-8"
     assert "redoc@next" in response.text