/usr/lib/python2.7/test/test_print.py is in libpython2.7-testsuite 2.7.11-7ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 | """Test correct operation of the print function.
"""
# In 2.6, this gives us the behavior we want. In 3.0, it has
# no function, but it still must parse correctly.
from __future__ import print_function
import unittest
from test import test_support
from StringIO import StringIO
NotDefined = object()
# A dispatch table all 8 combinations of providing
# sep, end, and file
# I use this machinery so that I'm not just passing default
# values to print, I'm either passing or not passing in the
# arguments
dispatch = {
(False, False, False):
lambda args, sep, end, file: print(*args),
(False, False, True):
lambda args, sep, end, file: print(file=file, *args),
(False, True, False):
lambda args, sep, end, file: print(end=end, *args),
(False, True, True):
lambda args, sep, end, file: print(end=end, file=file, *args),
(True, False, False):
lambda args, sep, end, file: print(sep=sep, *args),
(True, False, True):
lambda args, sep, end, file: print(sep=sep, file=file, *args),
(True, True, False):
lambda args, sep, end, file: print(sep=sep, end=end, *args),
(True, True, True):
lambda args, sep, end, file: print(sep=sep, end=end, file=file, *args),
}
# Class used to test __str__ and print
class ClassWith__str__:
def __init__(self, x):
self.x = x
def __str__(self):
return self.x
class TestPrint(unittest.TestCase):
def check(self, expected, args,
sep=NotDefined, end=NotDefined, file=NotDefined):
# Capture sys.stdout in a StringIO. Call print with args,
# and with sep, end, and file, if they're defined. Result
# must match expected.
# Look up the actual function to call, based on if sep, end, and file
# are defined
fn = dispatch[(sep is not NotDefined,
end is not NotDefined,
file is not NotDefined)]
with test_support.captured_stdout() as t:
fn(args, sep, end, file)
self.assertEqual(t.getvalue(), expected)
def test_print(self):
def x(expected, args, sep=NotDefined, end=NotDefined):
# Run the test 2 ways: not using file, and using
# file directed to a StringIO
self.check(expected, args, sep=sep, end=end)
# When writing to a file, stdout is expected to be empty
o = StringIO()
self.check('', args, sep=sep, end=end, file=o)
# And o will contain the expected output
self.assertEqual(o.getvalue(), expected)
x('\n', ())
x('a\n', ('a',))
x('None\n', (None,))
x('1 2\n', (1, 2))
x('1 2\n', (1, ' ', 2))
x('1*2\n', (1, 2), sep='*')
x('1 s', (1, 's'), end='')
x('a\nb\n', ('a', 'b'), sep='\n')
x('1.01', (1.0, 1), sep='', end='')
x('1*a*1.3+', (1, 'a', 1.3), sep='*', end='+')
x('a\n\nb\n', ('a\n', 'b'), sep='\n')
x('\0+ +\0\n', ('\0', ' ', '\0'), sep='+')
x('a\n b\n', ('a\n', 'b'))
x('a\n b\n', ('a\n', 'b'), sep=None)
x('a\n b\n', ('a\n', 'b'), end=None)
x('a\n b\n', ('a\n', 'b'), sep=None, end=None)
x('*\n', (ClassWith__str__('*'),))
x('abc 1\n', (ClassWith__str__('abc'), 1))
# 2.x unicode tests
x(u'1 2\n', ('1', u'2'))
x(u'u\1234\n', (u'u\1234',))
x(u' abc 1\n', (' ', ClassWith__str__(u'abc'), 1))
# errors
self.assertRaises(TypeError, print, '', sep=3)
self.assertRaises(TypeError, print, '', end=3)
self.assertRaises(AttributeError, print, '', file='')
def test_mixed_args(self):
# If an unicode arg is passed, sep and end should be unicode, too.
class Recorder(object):
def __init__(self, must_be_unicode):
self.buf = []
self.force_unicode = must_be_unicode
def write(self, what):
if self.force_unicode and not isinstance(what, unicode):
raise AssertionError("{0!r} is not unicode".format(what))
self.buf.append(what)
buf = Recorder(True)
print(u'hi', file=buf)
self.assertEqual(u''.join(buf.buf), 'hi\n')
del buf.buf[:]
print(u'hi', u'nothing', file=buf)
self.assertEqual(u''.join(buf.buf), 'hi nothing\n')
buf = Recorder(False)
print('hi', 'bye', end=u'\n', file=buf)
self.assertIsInstance(buf.buf[1], unicode)
self.assertIsInstance(buf.buf[3], unicode)
del buf.buf[:]
print(sep=u'x', file=buf)
self.assertIsInstance(buf.buf[-1], unicode)
def test_main():
test_support.run_unittest(TestPrint)
if __name__ == "__main__":
test_main()
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