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"""Unit tests for io.py."""
import unittest
from test import test_support
import io
class MockReadIO(io.RawIOBase):
def __init__(self, readStack):
self._readStack = list(readStack)
def read(self, n=None):
try:
return self._readStack.pop(0)
except:
return io.EOF
def fileno(self):
return 42
def readable(self):
return True
class MockWriteIO(io.RawIOBase):
def __init__(self):
self._writeStack = []
def write(self, b):
self._writeStack.append(b)
return len(b)
def writeable(self):
return True
def fileno(self):
return 42
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")
f.readinto(data)
self.assertEqual(data, b" worl")
f.readinto(data)
self.assertEqual(data, 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 = MockReadIO((b"abc", b"d", b"efg"))
bufIo = io.BufferedReader(rawIo)
self.assertEquals(b"abcdef", bufIo.read(6))
def testReadToEof(self):
rawIo = MockReadIO((b"abc", b"d", b"efg"))
bufIo = io.BufferedReader(rawIo)
self.assertEquals(b"abcdefg", bufIo.read(9000))
def testReadNoArgs(self):
rawIo = MockReadIO((b"abc", b"d", b"efg"))
bufIo = io.BufferedReader(rawIo)
self.assertEquals(b"abcdefg", bufIo.read())
def testFileno(self):
rawIo = MockReadIO((b"abc", b"d", b"efg"))
bufIo = io.BufferedReader(rawIo)
self.assertEquals(42, bufIo.fileno())
def testFilenoNoFileno(self):
# TODO 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 = MockWriteIO()
bufIo = io.BufferedWriter(writer, 8)
bufIo.write(b"abc")
self.assertFalse(writer._writeStack)
def testWriteOverflow(self):
writer = MockWriteIO()
bufIo = io.BufferedWriter(writer, 8)
bufIo.write(b"abc")
bufIo.write(b"defghijkl")
self.assertEquals(b"abcdefghijkl", writer._writeStack[0])
def testFlush(self):
writer = MockWriteIO()
bufIo = io.BufferedWriter(writer, 8)
bufIo.write(b"abc")
bufIo.flush()
self.assertEquals(b"abc", writer._writeStack[0])
# TODO. Tests for open()
def test_main():
test_support.run_unittest(IOTest, BytesIOTest, BufferedReaderTest,
BufferedWriterTest)
if __name__ == "__main__":
test_main()
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