diff --git a/test/core/definitions/serialization_test.dart b/test/core/definitions/serialization_test.dart
index 212aec3b..ce6516a5 100644
--- a/test/core/definitions/serialization_test.dart
+++ b/test/core/definitions/serialization_test.dart
@@ -328,5 +328,27 @@ void main() {
         pskSecurityScheme.toJson(),
       );
     });
+
+    test("ComboSecurityScheme", () async {
+      for (final comboVariantKey in ["allOf", "oneOf"]) {
+        final comboSecuritySchemeJson = {
+          "scheme": "combo",
+          comboVariantKey: ["foo", "bar"],
+        };
+
+        final parsedFields = {"scheme"};
+
+        final comboSecurityScheme = ComboSecurityScheme.fromJson(
+          comboSecuritySchemeJson,
+          PrefixMapping(),
+          parsedFields,
+        );
+
+        expect(
+          comboSecuritySchemeJson,
+          comboSecurityScheme.toJson(),
+        );
+      }
+    });
   });
 }