ABAP Unit: Can one call a method in the setup/teardown methods?

Hi all,
I'm using ABAP Unit test ClasseS (what's with the odd capitalization BTW?) in the class builder on NW7.0.
In my SETUP method I do not want to do a CREATE OBJECT, but want to use a GET_INSTANCE method of my main class to instantiate my object.
When I execute my unit test however the instance methods all fail with CX_REF_NOT_ASSIGNED - meaning there is no instance m_ref.
OK, fair enough methinks, let me debug and see what's going on.
Surprise: When I set a breakpoint in the SETUP method it all runs fine. Instances are instantiated and instance method tests execute successfully.
So now I'm a bit stuck trying to investigate a problem that disappears everytime you look at it, a bit like trying to see if the light is off when the fridge is closed... Any ideas?
Cheers,
Mike
Edit: Just to clarify, here's some code:
method setup.
    m_ref = zcl_myclass=>get_instance( im_key = 'ABC' ).
    " when debugging m_ref is always instantiated and test runs successfully!
endmethod.       "Setup
method get_some_data.
    result = m_ref->get_some_data( ).
    " without breakpoint in the setup method, this fails because m_ref is not assigned
endmethod.
Edited by: Mike Pokraka on Jun 23, 2008 11:57 PM

Never mind, found problem, schoolboy error:
My class_setup method created test data but the update hadn't completed so my GET_INSTANCE failed in normal execution but worked in debug because of the associated delay. 'commit work' needed an 'and wait' and now it's happy.

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