Specification use raw spec on clone

connexion/spec.py

@@ -196,7 +196,7 @@ def enforce_string_keys(obj):
         return OpenAPISpecification(spec, base_uri=base_uri)
 
     def clone(self):
-        return type(self)(copy.deepcopy(self._spec))
+        return type(self)(copy.deepcopy(self._raw_spec))
 
     @classmethod
     def load(cls, spec, *, arguments=None):

tests/api/conftest.py

@@ -2,6 +2,7 @@
 
 import pytest
 from connexion.middleware import MiddlewarePosition
+from connexion.options import SwaggerUIOptions
 from starlette.middleware.cors import CORSMiddleware
 from starlette.types import Receive, Scope, Send
 
@@ -22,6 +23,17 @@ def simple_openapi_app(app_class):
     )
 
 
+@pytest.fixture(scope="session")
+def swagger_ui_app(app_class):
+    return build_app_from_fixture(
+        "simple",
+        app_class=app_class,
+        spec_file=OPENAPI3_SPEC,
+        validate_responses=True,
+        swagger_ui_options=SwaggerUIOptions(spec_path="/spec.json"),
+    )
+
+
 @pytest.fixture(scope="session")
 def cors_openapi_app(app_class):
     app = build_app_from_fixture(

tests/api/test_swagger_ui.py

@@ -0,0 +1,4 @@
+def test_simple(swagger_ui_app):
+    app_client = swagger_ui_app.test_client()
+    response = app_client.get("/v1.0/spec.json")
+    assert response.status_code == 200