import py from py.__.test.tkinter import backend ReportBackend = backend.ReportBackend datadir = py.magic.autopath().dirpath('data') def test_capture_out_err(): config = py.test.config._reparse([datadir/'filetest.py']) backend = ReportBackend() backend.start_tests(config = config, args = config.args, tests = []) while backend.running: backend.update() backend.update() store = backend.get_store() assert len(store.get(failed = True)) == 1 failed = store.get(failed = True)[0] assert failed.stdout == 'STDOUT' assert failed.stderr == 'STDERR'