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75 lines
2.4 KiB
Python
75 lines
2.4 KiB
Python
import sys
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from testfixtures.comparison import compare
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from testfixtures.compat import StringIO
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class OutputCapture(object):
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"""
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A context manager for capturing output to the
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:attr:`sys.stdout` and :attr:`sys.stderr` streams.
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:param separate: If ``True``, ``stdout`` and ``stderr`` will be captured
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separately and their expected values must be passed to
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:meth:`~OutputCapture.compare`.
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.. note:: If ``separate`` is passed as ``True``,
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:attr:`OutputCapture.captured` will be an empty string.
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"""
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original_stdout = None
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original_stderr = None
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def __init__(self, separate=False):
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self.separate = separate
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def __enter__(self):
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self.output = StringIO()
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self.stdout = StringIO()
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self.stderr = StringIO()
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self.enable()
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return self
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def __exit__(self, *args):
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self.disable()
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def disable(self):
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"Disable the output capture if it is enabled."
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sys.stdout = self.original_stdout
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sys.stderr = self.original_stderr
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def enable(self):
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"Enable the output capture if it is disabled."
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if self.original_stdout is None:
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self.original_stdout = sys.stdout
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self.original_stderr = sys.stderr
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if self.separate:
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sys.stdout = self.stdout
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sys.stderr = self.stderr
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else:
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sys.stdout = sys.stderr = self.output
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@property
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def captured(self):
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"A property containing any output that has been captured so far."
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return self.output.getvalue()
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def compare(self, expected='', stdout='', stderr=''):
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"""
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Compare the captured output to that expected. If the output is
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not the same, an :class:`AssertionError` will be raised.
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:param expected: A string containing the expected combined output
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of ``stdout`` and ``stderr``.
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:param stdout: A string containing the expected output to ``stdout``.
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:param stderr: A string containing the expected output to ``stderr``.
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"""
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for prefix, _expected, captured in (
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(None, expected, self.captured),
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('stdout', stdout, self.stdout.getvalue()),
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('stderr', stderr, self.stderr.getvalue()),
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):
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compare(_expected.strip(), actual=captured.strip(), prefix=prefix)
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