'Output of the spawned process is written to standard output.'

@capture_logging(assertHasMessage, RUN_OUTPUT_MESSAGE, {'line': 'hello:test_runner.py'})
def test_writes_output(self, logger):

    reactor = ProcessCoreReactor()
    run(reactor, ['command', 'and', 'args'])
    [process] = reactor.processes
    process.processProtocol.childDataReceived(1, 'hello:test_runner.py\n')
