| author | Augie Fackler <raf@durin42.com> |
| Fri, 18 Jan 2019 13:32:02 -0500 | |
| branch | stable |
| changeset 41292 | 74525c3e9476 |
| parent 36362 | 01e29e885600 |
| child 43076 | 2372284d9457 |
| permissions | -rw-r--r-- |
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36362
01e29e885600
util: add a file object proxy that can read at most N bytes
Gregory Szorc <gregory.szorc@gmail.com>
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from __future__ import absolute_import, print_function |
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util: add a file object proxy that can read at most N bytes
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util: add a file object proxy that can read at most N bytes
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import io |
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import unittest |
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from mercurial import ( |
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util, |
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) |
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class CappedReaderTests(unittest.TestCase): |
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def testreadfull(self): |
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source = io.BytesIO(b'x' * 100) |
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reader = util.cappedreader(source, 10) |
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res = reader.read(10) |
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self.assertEqual(res, b'x' * 10) |
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self.assertEqual(source.tell(), 10) |
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source.seek(0) |
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reader = util.cappedreader(source, 15) |
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res = reader.read(16) |
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self.assertEqual(res, b'x' * 15) |
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self.assertEqual(source.tell(), 15) |
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source.seek(0) |
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reader = util.cappedreader(source, 100) |
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res = reader.read(100) |
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self.assertEqual(res, b'x' * 100) |
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self.assertEqual(source.tell(), 100) |
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source.seek(0) |
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reader = util.cappedreader(source, 50) |
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res = reader.read() |
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self.assertEqual(res, b'x' * 50) |
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self.assertEqual(source.tell(), 50) |
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source.seek(0) |
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def testreadnegative(self): |
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source = io.BytesIO(b'x' * 100) |
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reader = util.cappedreader(source, 20) |
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res = reader.read(-1) |
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self.assertEqual(res, b'x' * 20) |
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self.assertEqual(source.tell(), 20) |
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source.seek(0) |
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reader = util.cappedreader(source, 100) |
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res = reader.read(-1) |
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self.assertEqual(res, b'x' * 100) |
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self.assertEqual(source.tell(), 100) |
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source.seek(0) |
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def testreadmultiple(self): |
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source = io.BytesIO(b'x' * 100) |
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reader = util.cappedreader(source, 10) |
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for i in range(10): |
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res = reader.read(1) |
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self.assertEqual(res, b'x') |
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self.assertEqual(source.tell(), i + 1) |
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self.assertEqual(source.tell(), 10) |
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res = reader.read(1) |
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self.assertEqual(res, b'') |
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self.assertEqual(source.tell(), 10) |
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source.seek(0) |
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reader = util.cappedreader(source, 45) |
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for i in range(4): |
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res = reader.read(10) |
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self.assertEqual(res, b'x' * 10) |
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self.assertEqual(source.tell(), (i + 1) * 10) |
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res = reader.read(10) |
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self.assertEqual(res, b'x' * 5) |
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self.assertEqual(source.tell(), 45) |
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def readlimitpasteof(self): |
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source = io.BytesIO(b'x' * 100) |
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reader = util.cappedreader(source, 1024) |
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res = reader.read(1000) |
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self.assertEqual(res, b'x' * 100) |
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self.assertEqual(source.tell(), 100) |
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res = reader.read(1000) |
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self.assertEqual(res, b'') |
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self.assertEqual(source.tell(), 100) |
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if __name__ == '__main__': |
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import silenttestrunner |
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silenttestrunner.main(__name__) |