Fix test to allow x-merge-override. (#2032)

Author: jack-edmonds-dd

.generator/conftest.py

@@ -311,6 +311,8 @@ def operation_specs(specs):
     for version, spec in specs.items():
         by_operation[version] = {}
         for path in spec["paths"]:
+            if path == "x-merge-override":
+                continue
             for method, operation in spec["paths"][path].items():
                 by_operation[version][operation["operationId"]] = openapi.Operation(
                     operation["operationId"], operation, method, path