def test_has_returned_every_line_empty_file(self):
"""With empty file (a degenerate case), it is expected to have returned everything."""
with patch("file_read_backwards.buffer_work_space._get_file_size"
) as _get_file_size_mock:
fp_mock = Mock()
_get_file_size_mock.return_value = 0
b = BufferWorkSpace(fp_mock, chunk_size=io.DEFAULT_BUFFER_SIZE)
r = b.has_returned_every_line()
self.assertTrue(r)
def test_has_returned_every_line_with_not_fully_read_in_buffer_space(self):
"""With BufferWorkSpace that has not fully read in, it definitely has not returned everything.
Note that: not fully read in is represented by read_position != 0
"""
with patch("file_read_backwards.buffer_work_space._get_file_size"
) as _get_file_size_mock:
fp_mock = Mock()
_get_file_size_mock.return_value = 1024
b = BufferWorkSpace(fp_mock, chunk_size=io.DEFAULT_BUFFER_SIZE)
b.read_position = 1
r = b.has_returned_every_line()
self.assertFalse(r)
def test_has_returned_every_line_with_fully_read_in_and_processed_buffer_space(
self):
"""BufferWorkSpace that has been fully read in and fully processed has not returned everything.
Note: not fully read in and some unprocessed buffer is represented by read_position = 0 and read_buffer = None
"""
with patch("file_read_backwards.buffer_work_space._get_file_size"
) as _get_file_size_mock:
fp_mock = Mock()
_get_file_size_mock.return_value = 1024
b = BufferWorkSpace(fp_mock, chunk_size=io.DEFAULT_BUFFER_SIZE)
b.read_position = 0
b.read_buffer = None
r = b.has_returned_every_line()
self.assertTrue(r)
