Can unit testing be successfully added into an existing production project? If so, how and is it worth it?

Question

I\'m strongly considering adding unit testing to an existing project that is in production. It was started 18 months ago before I could really see any benefit of TDD

Answer 1

• yes, it is. when you start adding new functionality it can cause some old code modification and as results it is a source of potential bugs.
• (see the first one) before you start adding new functionality all (or almost) code (ideally) should be covered by unit tests.
• (see the first and second one) :). a new grandiose functionality can "destroy" the old worked code.