tests/test-cappedreader.py
author Augie Fackler <augie@google.com>
Sat, 05 Oct 2019 09:55:56 -0400
changeset 43049 6e8582ccf76d
parent 36362 01e29e885600
child 43076 2372284d9457
permissions -rw-r--r--
discovery: re-wrap expression to avoid a black bug Differential Revision: https://phab.mercurial-scm.org/D6969
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from __future__ import absolute_import, print_function
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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__)