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TTworkbench: Is it always required to use a TSI component even in a simple test case in TTCN-3?

TTworkbench, Windows, Linux, 32/64bit
No, you can omit the TSI definition so it will be created implicit as a mirror of the MTC with already mapped ports. Example:
testcase tc_simplecase() runs on MTCtype { ... }

But handle with care. As there is no handle to this implicit elements, it is not possible to reuse them with parallel components.

Product : TTCN-3 Language