while reading through Beginning Ruby on Rails E-Commerce, my eyes have
been really opened up to test driven development and how important it
is.
i have a problem though. i don’t think like a test driven developer…
i see these tests, and while they’re very insightful on how to write
test code, what i’m really looking for are testing guidelines. what
should i test? what should i just assume works, because the code i’ve
used 100 times before has always worked?
while going through the book, i’m thinking thins like “i wouldn’t have
that to test and see if the h1 tag was on the page”. or then there are
things that i wouldn’t even know how to test because examples weren’t
given in the book 
i realize that it’s a different mindset, and i also realize that it
won’t happen overnight. but what are things that other developers use
as a rule of thumb in order to decide how their tests should run? what
questions can i ask myself as i’m writing each action that can help me
make decisions or at least help train my mind to start thinking about
my tests.