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"""Unit tests for io.py."""
import unittest
from test import test_support
import io
class MockIO(io.RawIOBase):
def __init__(self, readStack=()):
self._readStack = list(readStack)
self._writeStack = []
def read(self, n=None):
try:
return self._readStack.pop(0)
except:
return io.EOF
def write(self, b):
self._writeStack.append(b)
return len(b)
def writable(self):
return True
def fileno(self):
return 42
def readable(self):
return True
def seekable(self):
return True
def seek(self, pos, whence):
pass
def tell(self):
return 42
class MockNonBlockWriterIO(io.RawIOBase):
def __init__(self, blockingScript):
self.bs = list(blockingScript)
self._write_stack = []
def write(self, b):
self._write_stack.append(b)
n = self.bs.pop(0)
if (n < 0):
raise io.BlockingIO(0, "test blocking", -n)
else:
return n
def writable(self):
return True
class IOTest(unittest.TestCase):
def write_ops(self, f):
f.write(b"blah.")
f.seek(0)
f.write(b"Hello.")
self.assertEqual(f.tell(), 6)
f.seek(-1, 1)
self.assertEqual(f.tell(), 5)
f.write(" world\n\n\n")
f.seek(0)
f.write("h")
f.seek(-2, 2)
f.truncate()
def read_ops(self, f):
data = f.read(5)
self.assertEqual(data, b"hello")
n = f.readinto(data)
self.assertEqual(n, 5)
self.assertEqual(data, b" worl")
n = f.readinto(data)
self.assertEqual(n, 2)
self.assertEqual(len(data), 5)
self.assertEqual(data[:2], b"d\n")
f.seek(0)
self.assertEqual(f.read(20), b"hello world\n")
f.seek(-6, 2)
self.assertEqual(f.read(5), b"world")
f.seek(-6, 1)
self.assertEqual(f.read(5), b" worl")
self.assertEqual(f.tell(), 10)
def test_raw_file_io(self):
f = io.open(test_support.TESTFN, "wb", buffering=0)
self.assertEqual(f.readable(), False)
self.assertEqual(f.writable(), True)
self.assertEqual(f.seekable(), True)
self.write_ops(f)
f.close()
f = io.open(test_support.TESTFN, "rb", buffering=0)
self.assertEqual(f.readable(), True)
self.assertEqual(f.writable(), False)
self.assertEqual(f.seekable(), True)
self.read_ops(f)
f.close()
def test_raw_bytes_io(self):
f = io.BytesIO()
self.write_ops(f)
data = f.getvalue()
self.assertEqual(data, b"hello world\n")
f = io.BytesIO(data)
self.read_ops(f)
class BytesIOTest(unittest.TestCase):
def testInit(self):
buf = b"1234567890"
bytesIo = io.BytesIO(buf)
def testRead(self):
buf = b"1234567890"
bytesIo = io.BytesIO(buf)
self.assertEquals(buf[:1], bytesIo.read(1))
self.assertEquals(buf[1:5], bytesIo.read(4))
self.assertEquals(buf[5:], bytesIo.read(900))
self.assertEquals(io.EOF, bytesIo.read())
def testReadNoArgs(self):
buf = b"1234567890"
bytesIo = io.BytesIO(buf)
self.assertEquals(buf, bytesIo.read())
self.assertEquals(io.EOF, bytesIo.read())
def testSeek(self):
buf = b"1234567890"
bytesIo = io.BytesIO(buf)
bytesIo.read(5)
bytesIo.seek(0)
self.assertEquals(buf, bytesIo.read())
bytesIo.seek(3)
self.assertEquals(buf[3:], bytesIo.read())
def testTell(self):
buf = b"1234567890"
bytesIo = io.BytesIO(buf)
self.assertEquals(0, bytesIo.tell())
bytesIo.seek(5)
self.assertEquals(5, bytesIo.tell())
bytesIo.seek(10000)
self.assertEquals(10000, bytesIo.tell())
class BufferedReaderTest(unittest.TestCase):
def testRead(self):
rawIo = MockIO((b"abc", b"d", b"efg"))
bufIo = io.BufferedReader(rawIo)
self.assertEquals(b"abcdef", bufIo.read(6))
def testReadNonBlocking(self):
# Inject some None's in there to simulate EWOULDBLOCK
rawIo = MockIO((b"abc", b"d", None, b"efg", None, None))
bufIo = io.BufferedReader(rawIo)
self.assertEquals(b"abcd", bufIo.read(6))
self.assertEquals(b"e", bufIo.read(1))
self.assertEquals(b"fg", bufIo.read())
self.assert_(None is bufIo.read())
self.assertEquals(io.EOF, bufIo.read())
def testReadToEof(self):
rawIo = MockIO((b"abc", b"d", b"efg"))
bufIo = io.BufferedReader(rawIo)
self.assertEquals(b"abcdefg", bufIo.read(9000))
def testReadNoArgs(self):
rawIo = MockIO((b"abc", b"d", b"efg"))
bufIo = io.BufferedReader(rawIo)
self.assertEquals(b"abcdefg", bufIo.read())
def testFileno(self):
rawIo = MockIO((b"abc", b"d", b"efg"))
bufIo = io.BufferedReader(rawIo)
self.assertEquals(42, bufIo.fileno())
def testFilenoNoFileno(self):
# XXX will we always have fileno() function? If so, kill
# this test. Else, write it.
pass
class BufferedWriterTest(unittest.TestCase):
def testWrite(self):
# Write to the buffered IO but don't overflow the buffer.
writer = MockIO()
bufIo = io.BufferedWriter(writer, 8)
bufIo.write(b"abc")
self.assertFalse(writer._writeStack)
def testWriteOverflow(self):
writer = MockIO()
bufIo = io.BufferedWriter(writer, 8)
bufIo.write(b"abc")
bufIo.write(b"defghijkl")
self.assertEquals(b"abcdefghijkl", writer._writeStack[0])
def testWriteNonBlocking(self):
raw = MockNonBlockWriterIO((9, 2, 22, -6, 10, 12, 12))
bufIo = io.BufferedWriter(raw, 8, 16)
bufIo.write(b"asdf")
bufIo.write(b"asdfa")
self.assertEquals(b"asdfasdfa", raw._write_stack[0])
bufIo.write(b"asdfasdfasdf")
self.assertEquals(b"asdfasdfasdf", raw._write_stack[1])
bufIo.write(b"asdfasdfasdf")
self.assertEquals(b"dfasdfasdf", raw._write_stack[2])
self.assertEquals(b"asdfasdfasdf", raw._write_stack[3])
bufIo.write(b"asdfasdfasdf")
# XXX I don't like this test. It relies too heavily on how the algorithm
# actually works, which we might change. Refactor later.
def testFileno(self):
rawIo = MockIO((b"abc", b"d", b"efg"))
bufIo = io.BufferedWriter(rawIo)
self.assertEquals(42, bufIo.fileno())
def testFlush(self):
writer = MockIO()
bufIo = io.BufferedWriter(writer, 8)
bufIo.write(b"abc")
bufIo.flush()
self.assertEquals(b"abc", writer._writeStack[0])
class BufferedRWPairTest(unittest.TestCase):
def testRWPair(self):
r = MockIO(())
w = MockIO()
pair = io.BufferedRWPair(r, w)
# XXX need implementation
class BufferedRandom(unittest.TestCase):
def testReadAndWrite(self):
raw = MockIO((b"asdf", b"ghjk"))
rw = io.BufferedRandom(raw, 8, 12)
self.assertEqual(b"as", rw.read(2))
rw.write(b"ddd")
rw.write(b"eee")
self.assertFalse(raw._writeStack) # Buffer writes
self.assertEqual(b"ghjk", rw.read()) # This read forces write flush
self.assertEquals(b"dddeee", raw._writeStack[0])
def testSeekAndTell(self):
raw = io.BytesIO(b"asdfghjkl")
rw = io.BufferedRandom(raw)
self.assertEquals(b"as", rw.read(2))
self.assertEquals(2, rw.tell())
rw.seek(0, 0)
self.assertEquals(b"asdf", rw.read(4))
rw.write(b"asdf")
rw.seek(0, 0)
self.assertEquals(b"asdfasdfl", rw.read())
self.assertEquals(9, rw.tell())
rw.seek(-4, 2)
self.assertEquals(5, rw.tell())
rw.seek(2, 1)
self.assertEquals(7, rw.tell())
self.assertEquals(b"fl", rw.read(11))
# XXX Tests for open()
def test_main():
test_support.run_unittest(IOTest, BytesIOTest, BufferedReaderTest,
BufferedWriterTest, BufferedRWPairTest,
BufferedRandom)
if __name__ == "__main__":
test_main()
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