Testing problem

I have a todo CLI app with the following structure

 sh

    
tree .
.
|-- cmd
|   `-- todo
|       |-- main.go
|       `-- main_test.go
|-- go.mod
|-- todo.go
|-- todo.json
`-- todo_test.go

  

In the main.go, I have a function called expand, it expand range string like in the cut command When I call the expand function from main_test.go, I get the following error

    
cmd/todo/main_test.go:141:12: undefined: expand
FAIL  PACKAGE_URI/todo/cmd/todo [build failed]
FAIL

  

I tried to change the function visibility, but this doesn't help either. I replicated the dir structure on a dummy project, and it did work!!

codeberg.org repo

edit: Add repo uri