On Thu, Jan 29, 2009 at 11:39:21AM +1100, Graham Cox wrote:
On 29 Jan 2009, at 11:06 am, David H. Silber wrote:
Is there some means of detecting if an instance has been
initialized?
I'm thinking not. Apple's "NSObject Class Reference" says "The init
method defined in the NSObject class does no initialization", and
googling around on the topic has not produced any means of doing
so. I
ask here in case someone has some knowledge I have not been able to
find. Even a definitive "No" would help, as I could stop searching
for
an answer which doesn't exist.
The answer is no, but in order to comply with Cocoa's non-optional
rule on this, if an instance exists, it's initialised. Otherwise
you've made a grave error.
WAYTTD?
I was hoping to be able to write a unit test which would confirm
that an
object had been properly initialized.
I have written unit tests that confirm/validate object initialization.
The ones I have written use accessors to gain then test (via
assertion) the value of properties that should be initialized. When I
have multiple initializers, I unit test them individually. Of course,
if there is a failure in the accessors, these unit tests will indicate
that the object isn't properly initialized, but still, catching bugs
is what unit testing is all about. If you are just looking to ensure
that the object was created at all, you can assert that it is not nil.
You can, for instance, create assertions that invoke methods on the
object (say, if you want to confirm its Class). What specifically
about the object's initialization are you wanting to confirm?
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