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74 lines
2.6 KiB
Python
74 lines
2.6 KiB
Python
import unittest
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from test import support
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from test.support import os_helper
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import io # C implementation.
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import _pyio as pyio # Python implementation.
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# Simple test to ensure that optimizations in the IO library deliver the
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# expected results. For best testing, run this under a debug-build Python too
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# (to exercise asserts in the C code).
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lengths = list(range(1, 257)) + [512, 1000, 1024, 2048, 4096, 8192, 10000,
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16384, 32768, 65536, 1000000]
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class BufferSizeTest:
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def try_one(self, s):
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# Write s + "\n" + s to file, then open it and ensure that successive
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# .readline()s deliver what we wrote.
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# Ensure we can open TESTFN for writing.
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os_helper.unlink(os_helper.TESTFN)
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# Since C doesn't guarantee we can write/read arbitrary bytes in text
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# files, use binary mode.
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f = self.open(os_helper.TESTFN, "wb")
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try:
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# write once with \n and once without
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f.write(s)
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f.write(b"\n")
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f.write(s)
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f.close()
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f = open(os_helper.TESTFN, "rb")
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line = f.readline()
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self.assertEqual(line, s + b"\n")
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line = f.readline()
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self.assertEqual(line, s)
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line = f.readline()
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self.assertFalse(line) # Must be at EOF
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f.close()
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finally:
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os_helper.unlink(os_helper.TESTFN)
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def drive_one(self, pattern):
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for length in lengths:
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# Repeat string 'pattern' as often as needed to reach total length
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# 'length'. Then call try_one with that string, a string one larger
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# than that, and a string one smaller than that. Try this with all
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# small sizes and various powers of 2, so we exercise all likely
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# stdio buffer sizes, and "off by one" errors on both sides.
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q, r = divmod(length, len(pattern))
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teststring = pattern * q + pattern[:r]
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self.assertEqual(len(teststring), length)
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self.try_one(teststring)
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self.try_one(teststring + b"x")
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self.try_one(teststring[:-1])
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def test_primepat(self):
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# A pattern with prime length, to avoid simple relationships with
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# stdio buffer sizes.
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self.drive_one(b"1234567890\00\01\02\03\04\05\06")
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def test_nullpat(self):
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self.drive_one(b'\0' * 1000)
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class CBufferSizeTest(BufferSizeTest, unittest.TestCase):
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open = io.open
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class PyBufferSizeTest(BufferSizeTest, unittest.TestCase):
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open = staticmethod(pyio.open)
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if __name__ == "__main__":
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unittest.main()
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