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Unit testing with gtest

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with reference to



Error: (E546) sc_start called after sc_stop has been called

seems to be logical. Can it have side effects, should (can) it be suppressed, or can the system be re-initialized, or is a better way for unit testing?

A related question: in a testing environment it would be advantageous for me, to use some SystemC-handled functions as normal C++ function (I mean to make some unit tests). I guess BEFORE calling sc_start, I can do so. Am I right, or they may have side effects? Is it safe to make unit tests together with SystemC-style testing, or which are the limitations?

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Once sc_stop() has been called, you are not allowed to call sc_start() anymore (cf. to clause 4.5.3 in IEEE Std 1666-2011). For each unit test involving a sc_start() and sc_stop() sequence, you will have to start an own process to ensure that the SystemC kernel is properly initialized. Testing frameworks, which link together individual unit test into one big executable containing the test runner are to my knowledge not suitable for unit testing SystemC applications. The reason is that the simulation kernel of the SystemC PoC simulator can currently not be restarted due to some implementation constraints. However, you can use script-based test runner approaches, e.g., provided by CMake/CTest.

Once you link to libsystemc, you will also have to provide a sc_main() function. Most SystemC functions will only properly work in the context of sc_main(), especially if they manipulate to design hierarchy (anything related to sc_object or control elaboration/simulation), You can check the SystemC regression test suite for examples on how to do unit testing in the SystemC context.

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