Assert results after parallel execution is done at suite level

I have 5 tests in 1 suite. All the tests are the same except few minor differences. I run the suite in parallel. Now 1 out of 5 (don't know which one of the 5 tests) tests should give response code of 200 and rest 4 response code of 480. 

How do i assert this after the parallel execution of the suite?

Assertion logic:

Iterate through the response of specific test step in each of 5 test cases.

Increase respective counters of 200 and 480 status codes

assert count of 200 == 1

assert count of 480 == 4

I tried putting the assertion logic it is tear down script however ReadyAPI hangs when assertion fails. I believe putting assertions in teardown script is known issue. 

How and where do i put my assertions?