| author | Martin von Zweigbergk <martinvonz@google.com> |
| Tue, 05 Apr 2022 12:06:32 -0700 | |
| changeset 49123 | 5d205e476057 |
| parent 48966 | 6000f5b25c9b |
| permissions | -rw-r--r-- |
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util: add a file object proxy that can read at most N bytes
Gregory Szorc <gregory.szorc@gmail.com>
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import io |
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import unittest |
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from mercurial import util |
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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__) |