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import unittest
from test import test_support
import io
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)
def test_main():
test_support.run_unittest(IOTest)
if __name__ == "__main__":
test_main()
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