[Core] Improvement Proposal: Adding fixed test functions in order to use them for every exchange

[makarid]

Hello, i would like to ask you if you find it good idea the following:

Adding fixed/static test functions that we will use in every exchange in order to test all the exchanges with the same functions. That way we will be sure that all the new exchanges function the same under the TradingService,MarketDataService,AccountService (Streaming also). What do you think?

For example, right now the same code does work for one exchange but on another exchange it doesn't work.