I'm new to Rails (it's my 2nd day reading the *Agile development with Rails
*book) and I'm kinda confused with the tests.
So let me get this straight: With* unit* testing, we see if our model is
working as it should (as our app's specifications demands) and Rails
provides us with all the unit testing features just to make our lifes
easier, so we don't have to manually enter values to see if they're
accepted or not. Is that right? And we're doing these tests to save
ourself from future work for fixing bugs in our code etc. With unit testing
we can pre-emptively fix our code's possible bugs, right from the beggining.
Unit testing seems clear, but Functional testing is a little confusing to
me: Why are we doing this? Where does it helps us? I know that we're
testing for example if there are certain elements in our rendered views,
for example: assert_select '#columns #side a', minimum: 4 but how could we
*not* have these elements in our views? Why are these kinds of test useful
and not just extra-code to write? To me it seems more like a
security-measure (checking if certain links appear on a page) more than a
test to see if something is wrong. However, judging from the file names,
functional testing is about the controller, right?
Thanks in advance :)
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