def test_rollover(self):
cb = CircularBuffer(5, ['A', 'B', 'C', 'D', 'E'])
assert cb.front() == 'A'
assert cb.length() == 5
assert cb.is_full() is True
cb.enqueue('X')
assert cb.front() == 'X'
assert cb.length() == 5
assert cb.is_full() is True
def test_dequeue(self):
q = CircularBuffer(['A', 'B', 'C'])
assert q.dequeue() == 'A'
assert q.length() == 2
assert q.dequeue() == 'B'
assert q.length() == 1
assert q.dequeue() == 'C'
assert q.length() == 0
assert q.is_empty() is True
with self.assertRaises(ValueError):
q.dequeue()
def test_length(self):
q = CircularBuffer()
assert q.length() == 0
q.enqueue('A')
assert q.length() == 1
q.enqueue('B')
assert q.length() == 2
q.dequeue()
assert q.length() == 1
q.dequeue()
assert q.length() == 0
def test_length(self):
cb = CircularBuffer(5)
assert cb.length() == 0
cb.enqueue('A')
assert cb.length() == 1
cb.enqueue('B')
assert cb.length() == 2
cb.dequeue()
assert cb.length() == 1
cb.dequeue()
assert cb.length() == 0
def test_enqueue(self):
q = CircularBuffer()
q.enqueue('A')
assert q.front() == 'A'
assert q.length() == 1
q.enqueue('B')
assert q.front() == 'A'
assert q.length() == 2
q.enqueue('C')
assert q.front() == 'A'
assert q.length() == 3
assert q.is_empty() is False
def test_enqueue(self):
cb = CircularBuffer(5)
cb.enqueue('A')
assert cb.front() == 'A'
assert cb.length() == 1
cb.enqueue('B')
assert cb.front() == 'A'
assert cb.length() == 2
cb.enqueue('C')
assert cb.front() == 'A'
assert cb.length() == 3
assert cb.is_empty() is False
def test_init(self):
q = CircularBuffer()
assert q.front() is None
assert q.length() == 0
assert q.is_empty() is True
def test_init_with_list(self):
q = CircularBuffer(['A', 'B', 'C'])
assert q.front() == 'A'
assert q.length() == 3
assert q.is_empty() is False
def test_init(self):
cb = CircularBuffer(5)
assert cb.front() is None
assert cb.length() == 0
assert cb.is_empty() is True