1 files changed, 7 insertions, 1 deletions
diff --git a/test/src/mbgl/test/stub_file_source.hpp b/test/src/mbgl/test/stub_file_source.hpp
index 85118e1a77..6cee8377c6 100644
--- a/test/src/mbgl/test/stub_file_source.hpp
+++ b/test/src/mbgl/test/stub_file_source.hpp
@@ -9,7 +9,12 @@ namespace mbgl {
 
 class StubFileSource : public FileSource {
 public:
-    StubFileSource();
+    enum class ResponseType {
+        Asynchronous = 0,
+        Synchronous
+    };
+
+    StubFileSource(ResponseType = ResponseType::Asynchronous);
     ~StubFileSource() override;
 
     std::unique_ptr<AsyncRequest> request(const Resource&, Callback) override;
@@ -36,6 +41,7 @@ private:
     optional<Response> defaultResponse(const Resource&);
 
     std::unordered_map<AsyncRequest*, std::tuple<Resource, ResponseFunction, Callback>> pending;
+    ResponseType type;
     util::Timer timer;
 };