Re: can we have diffrent execution flow for single test set?
To do what you want you could add the same tests into the test set several times and they will be separately identified by a number representing the instances of that test, like
(1)test_a, (2)test_a. Then you will have a multiples of the 20 tests. each set of tests, (all the ones containing"(1)" can be linked as you chose and all the ones containing "(2)" can be linked differently.
Just an idea.
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