Re: establishing logical test order?

Tony wrote:

> This is a very good example of why dependency injection is so useful.
When

David wrote:

>Are you implying that you mock our EVERY object outside the
object-in-test?
>so it is always only YOUR code you are testing?

In theory, yes, that is what one "should" do, but in practice, you have
to be a bit pragmatic at times.
I would say "it depends" (no pun intended!) on the situation, you may
make a judgement call that it is over engineering your solution, or that
it is just not worth doing simply so you can mock it out in a test (eg
because the effort to mock it is greater than the perceived benefit).

There are many places where DI can be very useful - eg when different
people are working independently on different "layers" of an
application, or where there are multiple implementations of something
which can be swapped in/out, or where you are testing and don't want to
use "expensive resources" (eg database calls) every time you run your
test.

Not everyone is aware of DI - I just thought I'd point it out as an
option to consider.

>DI is a good tool, but it is not the right tool for every dependency in
every situation.

Agreed. As with anything in life, over use can be just as bad as under
use :)


Cheers,

Tony
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