Tiled Map wont render

No errors, but its not rendering anywhere. plz halp.

public class GameScreen implements Screen {
	
	OTDCore otdCore;
	private TiledMap testMap;
	private TiledMapRenderer mapRenderer;
	private OrthographicCamera camera;
	private StretchViewport viewport;

	public GameScreen(OTDCore otdCore){
		this.otdCore = otdCore;
	}
	
	@Override
	public void show() {
		camera = new OrthographicCamera(1280, 720);
		camera.position.set(0, 0, 0);
		viewport = new StretchViewport(320, 240, camera);
		viewport.apply();
		testMap = new TmxMapLoader().load("Testing.tmx");
		mapRenderer = new OrthogonalTiledMapRenderer(testMap);
	

		

		}

	@Override
	public void render(float delta) {
		camera.update();
		mapRenderer.setView(camera);
		mapRenderer.render();
		}

	@Override
	public void resize(int width, int height) {
		viewport.update(width, height);
		}