[core] Add unit test for Style::Impl::onSpriteLoaded

test/src/mbgl/test/http_server.cpp

@@ -1,6 +1,7 @@
 #include <mbgl/test/util.hpp>
 
 #include <mbgl/util/chrono.hpp>
+#include <mbgl/util/io.hpp>
 #include <mbgl/util/logging.hpp>
 
 // Limit to 4 threads (default is the nbr of CPU cores)
@@ -9,6 +10,8 @@
 
 #include <atomic>
 
+using namespace std::literals::string_literals;
+
 namespace mbgl {
 namespace test {
 
@@ -182,6 +185,13 @@ void runServer(std::unique_ptr<httplib::Server>& server) {
         res.set_content("Request " + std::string(numbers), "text/plain");
     });
 
+    server->Get(R"(/online/(.*))", [](const Request req, Response& res) {
+        res.status = 200;
+        auto file = "test/fixtures/map/online/"s + std::string(req.matches[1]);
+        auto content = util::read_file(file);
+        res.set_content(content, "text/plain");
+    });
+
     server->listen("127.0.0.1", 3000);
 }
 

test/src/mbgl/test/stub_map_observer.hpp

@@ -38,11 +38,18 @@ public:
         }
     }
 
+    void onDidBecomeIdle() final {
+        if (didBecomeIdleCallback) {
+            didBecomeIdleCallback();
+        }
+    }
+
     std::function<void()> willStartLoadingMapCallback;
     std::function<void()> didFinishLoadingMapCallback;
     std::function<void()> didFailLoadingMapCallback;
     std::function<void()> didFinishLoadingStyleCallback;
     std::function<void(RenderFrameStatus)> didFinishRenderingFrameCallback;
+    std::function<void()> didBecomeIdleCallback;
 };