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