## Test Steps
1. Run gui.Main
2. This shows the window
![](screenshot.png)
3. Click the close button on the left corner.
4. This will close the window and exit the program.
## Test Steps
1. Run gui.Main
2. This shows the window
![](screenshot.png)
3. Click the close button on the left corner.
4. This will close the window and exit the program.