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I was watching this talk linked from Clean Architecure blog
It is a very interesting talk IMO. It does evangelizes BDD, but not completely. The talk does not advocate the whole outside-in BDD styled testing process.
But what is more interesting is - Ian says, unit testing as we do it - is wrong.
For example - the usual wisdom is, you think of a method and you write test for it and then
you implement the method. If you are not doing TDD, the process is reversed - i.e you implement
the method and you write test for it. But what Ian argues is, this entire approach is wrong.
The idea that, if you have a user.rb then there is a user_spec.rb is wrong.
He argues that even unit tests should be behaviour based. For example - there should be a
create_user_spec.rb and specifies behaviour of when a user is created. If while
implementing create method, you require another method - there is no need to unit test
that method separately because behaviour of user creation should cover it.