def test_readline( self ):
with open( PATH_5LINES, 'rb' ) as f:
self.assertEqual( EXPECTED_5LINES[0], f.readline() )
self.assertEqual( EXPECTED_5LINES[1], f.readline() )
self.assertEqual( EXPECTED_5LINES[2], f.readline() )
self.assertEqual( EXPECTED_5LINES[3], f.readline() )
self.assertEqual( b'', f.readline() )
def test_seek( self ):
with open( PATH_256, 'rb' ) as f:
# relative to start
f.seek( 7, os.SEEK_SET )
self.assertEquals( 7, f.tell() )
f.seek( 256, os.SEEK_SET )
self.assertEquals( 256, f.tell() )
f.seek( 512, os.SEEK_SET ) # beyond eof
self.assertEquals( 512, f.tell() )
# relative to end
f.seek( 0, os.SEEK_END )
self.assertEquals( 256, f.tell() )
f.seek( 256, os.SEEK_END )
self.assertEquals( 512, f.tell() )
f.seek( -256, os.SEEK_END )
self.assertEquals( 0, f.tell() )
f.seek( -249, os.SEEK_END )
self.assertEquals( 7, f.tell() )
# relative to current
f.seek( -6, os.SEEK_CUR )
self.assertEquals( 1, f.tell() )
f.seek( -1, os.SEEK_CUR )
self.assertEquals( 0, f.tell() )
self.assertRaises( IOError, f.seek, -1, os.SEEK_CUR )
self.assertEquals( 0, f.tell() )
f.seek( 256, os.SEEK_CUR )
self.assertEquals( 256, f.tell() )
f.seek( 256, os.SEEK_CUR )
self.assertEquals( 512, f.tell() )
self.assertRaises( ValueError, f.seek, 0, os.SEEK_SET ) # ValueError: I/O operation on closed file
def test_open_binary_ro_256( self ):
with open( PATH_256, 'rb' ) as f:
expected = bytes( x for x in range(0,256) )
self.assertEquals( expected[:1], f.read(1) )
self.assertEquals( expected[1:8], f.read(7) )
self.assertEquals( expected[8:], f.read() )
self.assertEquals( b'', f.read() )
def test_tell( self ):
with open( PATH_256, 'rb' ) as f:
self.assertEquals( 0, f.tell() )
f.read(7)
self.assertEquals( 7, f.tell() )
f.read() # read until eof
self.assertEquals( 256, f.tell() )
self.assertRaises( ValueError, f.tell ) # ValueError: I/O operation on closed file
def test_close( self ):
with open( PATH_ZERO, 'rb' ) as f:
self.assertTrue( not f.closed )
f.close()
self.assertTrue( f.closed )
f.close() # no effect
self.assertRaises( ValueError, f.read )
self.assertRaises( ValueError, f.readable )
self.assertRaises( ValueError, f.tell )
def test_fileno( self ):
with open( PATH_ZERO, 'rb' ) as f:
n1 = f.fileno()
n2 = f.fileno()
self.assertEquals( n1, n2 )
self.assertRaises( ValueError, f.fileno ) # ValueError: I/O operation on closed file
def test_writable( self ):
with open( PATH_ZERO, 'rb' ) as f:
self.assertTrue( not f.writable() )
self.assertRaises( ValueError, f.writable ) # ValueError: I/O operation on closed file
def test_closed( self ):
with open( PATH_ZERO, 'rb' ) as f:
self.assertTrue( not f.closed )
self.assertTrue( f.closed )
def test_open_binary_ro_zero( self ):
with open( PATH_ZERO, 'rb' ) as f:
self.assertEquals( b'\0', f.read() )
self.assertEquals( b'', f.read() )
def test_open_binary_ro_empty( self ):
with open( PATH_EMPTY, 'rb' ) as f:
self.assertEquals( b'', f.read() )
self.assertRaises( ValueError, f.read ) # ValueError: I/O operation on closed file
def test_readlines( self ):
with open( PATH_5LINES, 'rb' ) as f:
lines = f.readlines()
self.assertSequenceEqual( EXPECTED_5LINES, lines )
def test_flush( self ):
with open( PATH_ZERO, 'rb' ) as f:
f.flush()
