--- a/bindings/c/libjsonnet_test_file.c
+++ b/bindings/c/libjsonnet_test_file.c
@@ -16,6 +16,23 @@
 
 #include "libjsonnet.h"
 
+typedef struct JsonnetJsonValue* val_t;
+typedef struct JsonnetVm* vm_t;
+
+typedef struct native_ctx_t {
+    vm_t vm
+} native_ctx_t;
+
+val_t native_add(void* nctx, const struct JsonnetJsonValue* const* argv, int* success) {
+    native_ctx_t* ctx = nctx;
+    double a;
+    double b;
+    jsonnet_json_extract_number(ctx->vm, argv[0], &a);
+    jsonnet_json_extract_number(ctx->vm, argv[1], &b);
+    *success = 1;
+    return jsonnet_json_make_number(ctx->vm, a + b);
+}
+
 int main(int argc, const char **argv)
 {
     int error;
@@ -26,6 +43,12 @@
         return EXIT_FAILURE;
     }
     vm = jsonnet_make();
+
+    native_ctx_t* native_ctx = malloc(sizeof(native_ctx_t));
+    native_ctx->vm = vm;
+    const char* params[3] = {"a", "b", NULL};
+    jsonnet_native_callback(vm, "nativeAdd", native_add, native_ctx, params);
+
     output = jsonnet_evaluate_file(vm, argv[1], &error);
     if (error) {
         fprintf(stderr, "%s", output);
@@ -35,6 +58,7 @@
     }
     printf("%s", output);
     jsonnet_realloc(vm, output, 0);
+    free(native_ctx);
     jsonnet_destroy(vm);
     return EXIT_SUCCESS;
 }
--- /dev/null
+++ b/bindings/test.jsonnet
@@ -0,0 +1,5 @@
+{
+	a: 1,
+	b: "hello",
+	c: std.native("nativeAdd")(2, 3),
+}