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# Use of this source code is governed by a BSD-style

# license that can be found in the LICENSE file.

from libtest import assertRaises

doc = "open"

assertRaises(FileNotFoundError, open, "not-existent.file")

assertRaises(IsADirectoryError, open, ".")

f = open(__file__)

assert f is not None

doc = "read"

b = f.read(12)

assert b == '# Copyright '

b = f.read(4)

assert b == '2018'

b = f.read()

assert b != ''

b = f.read()

assert b == ''

doc = "readline"

f2 = open(__file__)

line = f2.readline()

f2.close()

doc = "write"

assertRaises(TypeError, f.write, 42)

# assertRaises(io.UnsupportedOperation, f.write, 'hello')

import sys

n = sys.stdout.write('hello')

assert n == 5

doc = "close"

assert f.close() == None

assertRaises(ValueError, f.read, 1)

assertRaises(ValueError, f.write, "")

assertRaises(ValueError, f.flush)

# closing a closed file should not throw an error

assert f.close() == None

doc = "finished"