def test_tail_limit(self):
"""tail returns trailing lines up to given limit"""
expected = b'\n'.join([
b'ing newline, and',
b'six lines total',
])
(actual, offset) = tail(BytesIO(SAMPLE_STRING), 40, 1024)
self.assertEqual(actual, expected)
self.assertEqual(offset, len(SAMPLE_STRING))
def test_tail_line_break(self):
"""tail breaks in middle of line if lines are longer than max length"""
expected = b'\n'.join([
# this line is partially returned
b'xclud-',
b'ing newline, and',
b'six lines total',
])
(actual, offset) = tail(BytesIO(SAMPLE_STRING), 40, 10)
self.assertEqual(actual, expected)
self.assertEqual(offset, len(SAMPLE_STRING))
def test_tail_noop(self):
"""tail returns all content if it fits in requested size"""
(actual, offset) = tail(BytesIO(SAMPLE_STRING), 1024, 1024)
self.assertEqual(actual, SAMPLE_STRING)
self.assertEqual(offset, len(SAMPLE_STRING))
def test_tail_empty(self):
"""tail of empty object returns empty"""
(actual, offset) = tail(BytesIO(), 1024, 1024)
self.assertEqual(actual, b'')
self.assertEqual(offset, 0)