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# -*- coding: utf-8 -*-
"""Tests for the byte stream operations."""
from __future__ import unicode_literals
import unittest
from dtfabric import errors
from dtfabric.runtime import byte_operations
from tests import test_lib
class StructOperationTest(test_lib.BaseTestCase):
"""Python struct-base byte stream operation tests."""
def testInitialize(self):
"""Tests the __init__ function."""
byte_stream_operation = byte_operations.StructOperation('b')
self.assertIsNotNone(byte_stream_operation)
with self.assertRaises(errors.FormatError):
byte_operations.StructOperation(None)
with self.assertRaises(errors.FormatError):
byte_operations.StructOperation('z')
def testReadFrom(self):
"""Tests the ReadFrom function."""
byte_stream_operation = byte_operations.StructOperation('i')
value = byte_stream_operation.ReadFrom(b'\x12\x34\x56\x78')
self.assertEqual(value, tuple([0x78563412]))
with self.assertRaises(IOError):
byte_stream_operation.ReadFrom(None)
with self.assertRaises(IOError):
byte_stream_operation.ReadFrom(b'\x12\x34\x56')
def testWriteTo(self):
"""Tests the WriteTo function."""
byte_stream_operation = byte_operations.StructOperation('i')
byte_stream = byte_stream_operation.WriteTo(tuple([0x78563412]))
self.assertEqual(byte_stream, b'\x12\x34\x56\x78')
with self.assertRaises(IOError):
byte_stream_operation.WriteTo(None)
with self.assertRaises(IOError):
byte_stream_operation.WriteTo(0x78563412)
with self.assertRaises(IOError):
byte_stream_operation.WriteTo(tuple([0x9078563412]))
if __name__ == '__main__':
unittest.main()
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