I'm approaching the TDD methodology for software development, reading guides and writing simple applications, because a client of my company wants a software and asked to develop it using TDD methodology.
So I was wondering, besides "trusting" the documentation and reports we'll create, how can one understand and be sure that TDD was followed. I thought that maybe the content of test can be different from the one that would be there if written after coding, but I'm not completely sure.
And even if this was the case, what are the hints I should be searching to understand if the software was developed that way, if I were to look to someone else's project?