def test_super_len_tell_ioerror(self, error):
"""Ensure that if tell gives an IOError super_len doesn't fail"""
class NoLenBoomFile(object):
def tell(self):
raise error()
def seek(self, offset, whence):
pass
assert super_len(NoLenBoomFile()) == 0
def test_super_len_handles_files_raising_weird_errors_in_tell(self, error):
"""If tell() raises errors, assume the cursor is at position zero."""
class BoomFile(object):
def __len__(self):
return 5
def tell(self):
raise error()
assert super_len(BoomFile()) == 0
def test_io_streams(self, stream, value):
"""Ensures that we properly deal with different kinds of IO streams."""
assert super_len(stream()) == 0
assert super_len(stream(value)) == 4
def test_super_len_with_no_matches(self):
"""Ensure that objects without any length methods default to 0"""
assert super_len(object()) == 0
def test_super_len_with_fileno(self):
with open(__file__, 'rb') as f:
length = super_len(f)
file_data = f.read()
assert length == len(file_data)
def test_super_len_with_tell(self):
foo = StringIO('12345')
assert super_len(foo) == 5
foo.read(2)
assert super_len(foo) == 3
def test_super_len_with_no__len__(self):
class LenFile(object):
def __init__(self):
self.len = 5
assert super_len(LenFile()) == 5
def test_super_len_with__len__(self):
foo = [1, 2, 3, 4]
len_foo = super_len(foo)
assert len_foo == 4
def test_file(self, tmpdir, mode, warnings_num, recwarn):
file_obj = tmpdir.join('test.txt')
file_obj.write('Test')
with file_obj.open(mode) as fd:
assert super_len(fd) == 4
assert len(recwarn) == warnings_num
def test_string(self):
assert super_len('Test') == 4
def test_super_len_correctly_calculates_len_of_partially_read_file(self):
"""Ensure that we handle partially consumed file like objects."""
s = StringIO()
s.write('foobarbogus')
assert super_len(s) == 0