Should support TestNet testing

[RohaanAdvani68]

Issue To Be Solved

The testing library should enable users to not only test the features in the local emulator environment, but also in the TestNet environment. This would enable developers to be more confident in their smart contracts working as expected in a "real" network. Developers should not have to rely on manual testing once deployed to TestNet.

It should be as simple as a switch in environment vars (i.e. network=testnet) to switch between testing environments.