/usr/lib/python3.7/test/test_imghdr.py is in libpython3.7-testsuite 3.7.0~b3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | import imghdr
import io
import os
import pathlib
import unittest
import warnings
from test.support import findfile, TESTFN, unlink
TEST_FILES = (
('python.png', 'png'),
('python.gif', 'gif'),
('python.bmp', 'bmp'),
('python.ppm', 'ppm'),
('python.pgm', 'pgm'),
('python.pbm', 'pbm'),
('python.jpg', 'jpeg'),
('python.ras', 'rast'),
('python.sgi', 'rgb'),
('python.tiff', 'tiff'),
('python.xbm', 'xbm'),
('python.webp', 'webp'),
('python.exr', 'exr'),
)
class UnseekableIO(io.FileIO):
def tell(self):
raise io.UnsupportedOperation
def seek(self, *args, **kwargs):
raise io.UnsupportedOperation
class TestImghdr(unittest.TestCase):
@classmethod
def setUpClass(cls):
cls.testfile = findfile('python.png', subdir='imghdrdata')
with open(cls.testfile, 'rb') as stream:
cls.testdata = stream.read()
def tearDown(self):
unlink(TESTFN)
def test_data(self):
for filename, expected in TEST_FILES:
filename = findfile(filename, subdir='imghdrdata')
self.assertEqual(imghdr.what(filename), expected)
with open(filename, 'rb') as stream:
self.assertEqual(imghdr.what(stream), expected)
with open(filename, 'rb') as stream:
data = stream.read()
self.assertEqual(imghdr.what(None, data), expected)
self.assertEqual(imghdr.what(None, bytearray(data)), expected)
def test_pathlike_filename(self):
for filename, expected in TEST_FILES:
with self.subTest(filename=filename):
filename = findfile(filename, subdir='imghdrdata')
self.assertEqual(imghdr.what(pathlib.Path(filename)), expected)
def test_register_test(self):
def test_jumbo(h, file):
if h.startswith(b'eggs'):
return 'ham'
imghdr.tests.append(test_jumbo)
self.addCleanup(imghdr.tests.pop)
self.assertEqual(imghdr.what(None, b'eggs'), 'ham')
def test_file_pos(self):
with open(TESTFN, 'wb') as stream:
stream.write(b'ababagalamaga')
pos = stream.tell()
stream.write(self.testdata)
with open(TESTFN, 'rb') as stream:
stream.seek(pos)
self.assertEqual(imghdr.what(stream), 'png')
self.assertEqual(stream.tell(), pos)
def test_bad_args(self):
with self.assertRaises(TypeError):
imghdr.what()
with self.assertRaises(AttributeError):
imghdr.what(None)
with self.assertRaises(TypeError):
imghdr.what(self.testfile, 1)
with self.assertRaises(AttributeError):
imghdr.what(os.fsencode(self.testfile))
with open(self.testfile, 'rb') as f:
with self.assertRaises(AttributeError):
imghdr.what(f.fileno())
def test_invalid_headers(self):
for header in (b'\211PN\r\n',
b'\001\331',
b'\x59\xA6',
b'cutecat',
b'000000JFI',
b'GIF80'):
self.assertIsNone(imghdr.what(None, header))
def test_string_data(self):
with warnings.catch_warnings():
warnings.simplefilter("ignore", BytesWarning)
for filename, _ in TEST_FILES:
filename = findfile(filename, subdir='imghdrdata')
with open(filename, 'rb') as stream:
data = stream.read().decode('latin1')
with self.assertRaises(TypeError):
imghdr.what(io.StringIO(data))
with self.assertRaises(TypeError):
imghdr.what(None, data)
def test_missing_file(self):
with self.assertRaises(FileNotFoundError):
imghdr.what('missing')
def test_closed_file(self):
stream = open(self.testfile, 'rb')
stream.close()
with self.assertRaises(ValueError) as cm:
imghdr.what(stream)
stream = io.BytesIO(self.testdata)
stream.close()
with self.assertRaises(ValueError) as cm:
imghdr.what(stream)
def test_unseekable(self):
with open(TESTFN, 'wb') as stream:
stream.write(self.testdata)
with UnseekableIO(TESTFN, 'rb') as stream:
with self.assertRaises(io.UnsupportedOperation):
imghdr.what(stream)
def test_output_stream(self):
with open(TESTFN, 'wb') as stream:
stream.write(self.testdata)
stream.seek(0)
with self.assertRaises(OSError) as cm:
imghdr.what(stream)
if __name__ == '__main__':
unittest.main()
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