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circular_buffer_test.py
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122 lines (102 loc) · 3.66 KB
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import unittest
from circular_buffer import CircularBuffer
# Tests adapted from `problem-specifications//canonical-data.json`
class CircularBufferTest(unittest.TestCase):
def test_reading_empty_buffer_should_fail(self):
buf = CircularBuffer(1)
with self.assertRaisesWithMessage(BaseException):
buf.read()
def test_can_read_an_item_just_written(self):
buf = CircularBuffer(1)
buf.write("1")
self.assertEqual(buf.read(), "1")
def test_each_item_may_only_be_read_once(self):
buf = CircularBuffer(1)
buf.write("1")
self.assertEqual(buf.read(), "1")
with self.assertRaisesWithMessage(BaseException):
buf.read()
def test_items_are_read_in_the_order_they_are_written(self):
buf = CircularBuffer(2)
buf.write("1")
buf.write("2")
self.assertEqual(buf.read(), "1")
self.assertEqual(buf.read(), "2")
def test_full_buffer_can_t_be_written_to(self):
buf = CircularBuffer(1)
buf.write("1")
with self.assertRaisesWithMessage(BaseException):
buf.write("2")
def test_a_read_frees_up_capacity_for_another_write(self):
buf = CircularBuffer(1)
buf.write("1")
self.assertEqual(buf.read(), "1")
buf.write("2")
self.assertEqual(buf.read(), "2")
def test_read_position_is_maintained_even_across_multiple_writes(self):
buf = CircularBuffer(3)
buf.write("1")
buf.write("2")
self.assertEqual(buf.read(), "1")
buf.write("3")
self.assertEqual(buf.read(), "2")
self.assertEqual(buf.read(), "3")
def test_items_cleared_out_of_buffer_can_t_be_read(self):
buf = CircularBuffer(1)
buf.write("1")
buf.clear()
with self.assertRaisesWithMessage(BaseException):
buf.read()
def test_clear_frees_up_capacity_for_another_write(self):
buf = CircularBuffer(1)
buf.write("1")
buf.clear()
buf.write("2")
self.assertEqual(buf.read(), "2")
def test_clear_does_nothing_on_empty_buffer(self):
buf = CircularBuffer(1)
buf.clear()
buf.write("1")
self.assertEqual(buf.read(), "1")
def test_overwrite_acts_like_write_on_non_full_buffer(self):
buf = CircularBuffer(2)
buf.write("1")
buf.overwrite("2")
self.assertEqual(buf.read(), "1")
self.assertEqual(buf.read(), "2")
def test_overwrite_replaces_the_oldest_item_on_full_buffer(self):
buf = CircularBuffer(2)
buf.write("1")
buf.write("2")
buf.overwrite("3")
self.assertEqual(buf.read(), "2")
self.assertEqual(buf.read(), "3")
def test_overwrite_replaces_the_oldest_item_remaining_in_buffer_following_a_read(
self
):
buf = CircularBuffer(3)
buf.write("1")
buf.write("2")
buf.write("3")
self.assertEqual(buf.read(), "1")
buf.write("4")
buf.overwrite("5")
self.assertEqual(buf.read(), "3")
self.assertEqual(buf.read(), "4")
self.assertEqual(buf.read(), "5")
def test_initial_clear_does_not_affect_wrapping_around(self):
buf = CircularBuffer(2)
buf.clear()
buf.write("1")
buf.write("2")
buf.overwrite("3")
buf.overwrite("4")
self.assertEqual(buf.read(), "3")
self.assertEqual(buf.read(), "4")
with self.assertRaisesWithMessage(BaseException):
buf.read()
# Utility functions
def assertRaisesWithMessage(self, exception):
return self.assertRaisesRegex(exception, r".+")
if __name__ == "__main__":
unittest.main()