CakePHP can not find table for model with another dbconfig in tests

I have a chain:

MyControllerTest -> 
testAction(...) -> 
MyController -> 
uses (Model1, Model2) ->
Model1->method(), Model2->method() ....

Model1 has a default dbConfig, but Model2 uses another one:

...
public $useDbConfig = 'ConfigName';
...

On start test, Model2 fails: table %table% not found.

Bypassing the unit-test, directly from browser, it works.

How do I can force valid dbConfig in Model2 in my test?