since several students already had issues: Do NOT use the Kate editor installed in the VM for editing files in the project, especially not
.ref files. Beware
Kate is the text editor used by default for opening all kinds of text files. Yes, you should not use the default editor.
The reason is that this editor tries to be clever by stripping of trailing spaces and newlines at the end of file. However, the
.ref files need an extra space at the end. Kate just deletes this every time you safe, and then you no longer pass the tests.
Instead, use VSCode or