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* introduce and Env trait to mock the outside world * make argument parsing unit-testable * add get_stderr to FakeEnv * fakecmd and print errors into the env * change ExitCode::from to into Co-authored-by: Ximon Eighteen <3304436+ximon18@users.noreply.github.com> * update some comments * cargo fmt * document some more of the testing utilities * use exit_code method on clap errors * bump minimal clap version * reexport RealEnv * remove .lock() calls for stdout and stderr * remove args field from FakeCmd * improve docs for Env * cargo fmt * use mutex in FakeStream * improve FmtWriter implementation for a tiny bit more performance * car go ffffffmmmmmmtttttt --------- Co-authored-by: Ximon Eighteen <3304436+ximon18@users.noreply.github.com>