def test_view_interface(self):
data = self.data
size = len(data)
fp = io.BytesIO(data)
gf = GettableFile(fp)
fv = FileView(gf)
# view, slice index
subfv = fv[1:-1]
self.assertEqual(subfv.read(), data[1:-1])
self.assertEqual(len(subfv), size - 2)
# view, integer index
self.assertEqual(fv[2], data[2])
# view, out of bounds index
with self.assertRaises(IndexError):
fv[size]
# view are independent
self.assertEqual(fv[:2].read(), data[:2])
self.assertEqual(fv[-2:].read(), data[-2:])
def test_file_interface(self):
data = self.data
size = len(data)
fp = io.BytesIO(data)
gf = GettableFile(fp)
fv = FileView(gf)
# partial read
self.assertEqual(fv.read(1), data[0:1])
# read all, also check continuity
self.assertEqual(fv.read(), data[1:])
# seek and tell
self.assertEqual(len(fv), size)
self.assertEqual(fv.seek(2), 2)
self.assertEqual(fv.tell(), 2)
self.assertEqual(fv.seek(2, io.SEEK_CUR), 4)
self.assertEqual(fv.tell(), 4)
self.assertEqual(fv.seek(0, io.SEEK_END), size)
self.assertEqual(fv.tell(), size)
# IOBase derived methods
fv.seek(0)
self.assertEqual(fv.readlines(), [data])