What do you do with a developer who does not test his code? [closed]

Question

One of our developers is continually writing code and putting it into version control without testing it. The quality of our code is suffering as a result.

Besides getting rid of the developer, how can I solve this problem?

EDIT

I have talked to him about it number of times and even given him written warning

Answer 1

If you can do code reviews -- that's a perfect place to catch it.

We require reviews prior to merging to iteration trunk, so typically everything is caught then.