[coldbox-3.5.1] BaseModelTest doesn't know getWireBox()


i’ve already tried to post this request, but i think it didn’ work, so i try again.

i’m quite new to coldbox. i have written a model using property name=“wbP” inject=“wirebox:populator”;
when i’m in the test-class (extending coldbox.system.testing.BaseModelTest) belonging to this class, i have to provide a value for this property. i tried to do that in the setup-function like so:
model.$property( “wbP”, “variables”, getWireBox().getObjectPopulator() );

unfortunately i now get the error, that the method getWireBox() was not found, but that should be included in BaseModelTest, or what did i do wrong?

thanks in advance