Add MockedEmptyHandlersServer fuzz target

fuzzing/MockedEmptyHandlersServer.cpp

@@ -0,0 +1,36 @@
+#include "App.h"
+
+#include "helpers.h"
+
+/* This function pushes data to the uSockets mock */
+extern "C" void us_loop_read_mocked_data(struct us_loop *loop, char *data, unsigned int size);
+
+uWS::TemplatedApp<false> *app;
+us_listen_socket_t *listenSocket;
+
+extern "C" int LLVMFuzzerInitialize(int *argc, char ***argv) {
+
+    app = new uWS::App();
+
+    struct PerSocketData {
+        int nothing;
+    };
+
+    app->ws<PerSocketData>("/*", {
+        /* Having no handlers here should not crash */
+    }).listen(9001, [](us_listen_socket_t *listenSocket) {
+        if (listenSocket) {
+            std::cout << "Listening on port " << 9001 << std::endl;
+            ::listenSocket = listenSocket;
+        }
+    });
+
+    return 0;
+}
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+
+    us_loop_read_mocked_data((struct us_loop *) uWS::Loop::get(), (char *) makePadded(data, size), size);
+
+    return 0;
+}