> A BitcoinTestFramework child class which can be imported by an external user or
> project. TestShell.setup() initiates an underlying BitcoinTestFramework object
> with bitcoind subprocesses, rpc interfaces and test logging.
> TestShell.shutdown() safely tears down the BitcoinTestFramework object.
This is a backport of Core PR17288 [6/7]
https://github.com/bitcoin/bitcoin/pull/17288/commits/f5112369cf91451d2d0bf574a9bfdaea04696939
Depends on D8245