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132 lines
4.2 KiB
Python
132 lines
4.2 KiB
Python
import unittest
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from io import StringIO
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from test import support
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NotDefined = object()
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# A dispatch table all 8 combinations of providing
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# sep, end, and file.
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# I use this machinery so that I'm not just passing default
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# values to print, I'm either passing or not passing in the
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# arguments.
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dispatch = {
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(False, False, False):
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lambda args, sep, end, file: print(*args),
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(False, False, True):
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lambda args, sep, end, file: print(file=file, *args),
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(False, True, False):
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lambda args, sep, end, file: print(end=end, *args),
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(False, True, True):
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lambda args, sep, end, file: print(end=end, file=file, *args),
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(True, False, False):
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lambda args, sep, end, file: print(sep=sep, *args),
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(True, False, True):
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lambda args, sep, end, file: print(sep=sep, file=file, *args),
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(True, True, False):
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lambda args, sep, end, file: print(sep=sep, end=end, *args),
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(True, True, True):
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lambda args, sep, end, file: print(sep=sep, end=end, file=file, *args),
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}
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# Class used to test __str__ and print
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class ClassWith__str__:
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def __init__(self, x):
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self.x = x
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def __str__(self):
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return self.x
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class TestPrint(unittest.TestCase):
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"""Test correct operation of the print function."""
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def check(self, expected, args,
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sep=NotDefined, end=NotDefined, file=NotDefined):
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# Capture sys.stdout in a StringIO. Call print with args,
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# and with sep, end, and file, if they're defined. Result
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# must match expected.
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# Look up the actual function to call, based on if sep, end,
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# and file are defined.
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fn = dispatch[(sep is not NotDefined,
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end is not NotDefined,
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file is not NotDefined)]
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with support.captured_stdout() as t:
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fn(args, sep, end, file)
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self.assertEqual(t.getvalue(), expected)
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def test_print(self):
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def x(expected, args, sep=NotDefined, end=NotDefined):
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# Run the test 2 ways: not using file, and using
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# file directed to a StringIO.
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self.check(expected, args, sep=sep, end=end)
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# When writing to a file, stdout is expected to be empty
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o = StringIO()
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self.check('', args, sep=sep, end=end, file=o)
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# And o will contain the expected output
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self.assertEqual(o.getvalue(), expected)
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x('\n', ())
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x('a\n', ('a',))
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x('None\n', (None,))
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x('1 2\n', (1, 2))
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x('1 2\n', (1, ' ', 2))
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x('1*2\n', (1, 2), sep='*')
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x('1 s', (1, 's'), end='')
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x('a\nb\n', ('a', 'b'), sep='\n')
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x('1.01', (1.0, 1), sep='', end='')
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x('1*a*1.3+', (1, 'a', 1.3), sep='*', end='+')
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x('a\n\nb\n', ('a\n', 'b'), sep='\n')
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x('\0+ +\0\n', ('\0', ' ', '\0'), sep='+')
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x('a\n b\n', ('a\n', 'b'))
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x('a\n b\n', ('a\n', 'b'), sep=None)
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x('a\n b\n', ('a\n', 'b'), end=None)
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x('a\n b\n', ('a\n', 'b'), sep=None, end=None)
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x('*\n', (ClassWith__str__('*'),))
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x('abc 1\n', (ClassWith__str__('abc'), 1))
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# errors
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self.assertRaises(TypeError, print, '', sep=3)
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self.assertRaises(TypeError, print, '', end=3)
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self.assertRaises(AttributeError, print, '', file='')
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def test_print_flush(self):
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# operation of the flush flag
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class filelike:
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def __init__(self):
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self.written = ''
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self.flushed = 0
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def write(self, str):
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self.written += str
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def flush(self):
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self.flushed += 1
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f = filelike()
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print(1, file=f, end='', flush=True)
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print(2, file=f, end='', flush=True)
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print(3, file=f, flush=False)
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self.assertEqual(f.written, '123\n')
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self.assertEqual(f.flushed, 2)
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# ensure exceptions from flush are passed through
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class noflush:
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def write(self, str):
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pass
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def flush(self):
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raise RuntimeError
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self.assertRaises(RuntimeError, print, 1, file=noflush(), flush=True)
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if __name__ == "__main__":
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unittest.main()
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