rename App.fxml to Calc.fxml

src/main/java/app/CalcApp.java

@@ -15,7 +15,7 @@ public class CalcApp extends Application {
 
     @Override
     public void start(Stage stage) throws IOException {
-        FXMLLoader fxmlLoader = new FXMLLoader(this.getClass().getResource("App.fxml"));
+        FXMLLoader fxmlLoader = new FXMLLoader(this.getClass().getResource("Calc.fxml"));
         Parent parent = fxmlLoader.load();
         stage.setScene(new Scene(parent));
         stage.show();

src/test/java/app/AppTest.java

@@ -29,7 +29,7 @@ public class AppTest extends ApplicationTest {
 
     @Override
     public void start(Stage stage) throws IOException {
-        FXMLLoader fxmlLoader = new FXMLLoader(this.getClass().getResource("App.fxml"));
+        FXMLLoader fxmlLoader = new FXMLLoader(this.getClass().getResource("Calc.fxml"));
         root = fxmlLoader.load();
         controller = fxmlLoader.getController();
         stage.setScene(new Scene(root));