Sooo the LLM codes just like me ?

No; it doesn't care when it gives you incomplete garbage.

You have to tell it to validate its own work by adding to, refactoring, and running the tests before it replies.

Most junior developers do care and would never dump partial solutions on a prompter as though they're sufficient like LLMs.

Every time I remember to get `make test-coverage` working and have myself or the LLM focus on lines that aren't covered by tests.

Junior or Senior, an employee wouldn't turn in such incomplete, not compiling assignments that % of the time; even given inadequate prompts as specifications.