create window on test

src/lib.rs

@@ -42,10 +42,31 @@ pub fn run<C: Callbacks>(config: Config) {
 
 #[cfg(test)]
 mod tests {
-    use super::Config;
+    use super::{Config, Callbacks, Event, Graphics};
+    use crate::run;
+
+    struct TestCallbacks {
+    }
+
+    impl Callbacks for TestCallbacks {
+        fn load_state() -> Self {
+            TestCallbacks{
+            }
+        }
+        //fn preLoop(&mut self){}
+        fn handle_event(&mut self, ev: Event){
+        }
+        fn update(&mut self){
+        }
+        fn draw(&self, graphics: &mut Graphics){
+        }
+        fn clean_up(self){
+        }
+    }
 
     #[test]
     fn it_works() {
-        let _config = Config::default();
+        let config = Config::default();
+        run::<TestCallbacks>(config);
     }
 }