From forum post:

I have created the following build step:

default
: Step type: Fail current step conditionally
: Step necessary condition: var["TESTING"].value!="DONT"
: Description: ------
: Failure condition: 0==0
: Failure message: TRIED TO RUN: [${var["TESTING"]}]

If I run this with the TESTING variable defined thusly:
: TESTING=DO
I get:
: ERROR - Step "default" is failed: TRIED TO RUN: [DO]

And, if I run it with the following:
: TESTING=DONT
I get:
: INFO - Necessary condition not satisfied, skipping step "default".

However, if I define TESTING via another variable:
: TEST_A=DONT
: TESTING=${var["TEST_A"]}
I get:
: ERROR - Step "default" is failed: TRIED TO RUN: [DONT]

In this last case, I am expecting the step not to run. Please confirm.