Class AssertNotPrints

IPython/testing/tools.py:387–409

Context manager for checking that certain output *isn't* produced. Counterpart of AssertPrints

"""

class AssertNotPrints(AssertPrints):
    """Context manager for checking that certain output *isn't* produced.

    Counterpart of AssertPrints"""
    def __exit__(self, etype, value, traceback):
        try:
            if value is not None:
                # If an error was raised, don't check anything else
                self.tee.close()
                return False
            self.tee.flush()
            setattr(sys, self.channel, self.orig_stream)
            printed = self.buffer.getvalue()
            for s in self.s:
                if isinstance(s, _re_type):
                    assert not s.search(printed),printed_msg.format(
                        s.pattern, self.channel, printed)
                else:
                    assert s not in printed, printed_msg.format(
                        s, self.channel, printed)
            return False
        finally:
            self.tee.close()

@contextmanager
def mute_warn():