def test_pipe_exception(): "How an exception in a pipe should look like" f = pipe | str | foreach(X.upper()) | foreach(~X.lower() | int) | list with pytest.raises(ValueError) as excinfo: f('adfasfa') assert excinfo.value.message == ( "invalid literal for int() with base 10: 'a'\n" " in pipe | X.lower | X() | int\n" " in pipe | str | foreach(X.upper | X()) | foreach(X.lower | X() | int) | list" )