test.support.captured_stderr()
A context managers that temporarily replaces the named stream with io.StringIO object.
Example use with output streams:
with captured_stdout() as stdout, captured_stderr() as stderr:
print("hello")
print("error", file=sys.stderr)
assert stdout.getvalue() == "hello\n"
assert stderr.getvalue() == "error\n"
Example use with input stream:
with captured_stdin() as stdin:
stdin.write('hello\n')
stdin.seek(0)
# call test code that consumes from sys.stdin
captured = input()
self.assertEqual(captured, "hello")
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