def test_add_to_fifo():
fifo = PacketFifo(10)
assert not fifo
fifo[123] = 456
assert len(fifo) == 1
assert fifo
def test_add_multiple():
fifo = PacketFifo(10)
fifo[0] = 1
fifo[1] = 2
fifo[2] = 3
assert fifo[0] == 1
assert fifo[1] == 2
assert fifo[2] == 3
assert len(fifo) == 3
assert fifo
def test_iter_over_indices():
fifo = PacketFifo(10)
fifo[1] = 1
fifo[2] = 2
fifo[3] = 2
sum = 0
for i in fifo:
sum += i
assert sum == (1 + 2 + 3)
def test_add_overflow_removes_oldest():
fifo = PacketFifo(2)
fifo[0] = 1
fifo[1] = 2
fifo[2] = 3
assert len(fifo) == 2
assert 0 not in fifo
assert fifo[1] == 2
assert fifo[2] == 3
fifo[3] = 4
assert len(fifo) == 2
assert 1 not in fifo
assert fifo[2] == 3
assert fifo[3] == 4
def test_del_not_supported():
fifo = PacketFifo(2)
fifo[0] = 1
with pytest.raises(NotImplementedError):
del fifo[0]
def test_clear_fifo():
fifo = PacketFifo(2)
fifo[0] = 1
fifo[1] = 2
fifo.clear()
assert len(fifo) == 0
def test_in_operator():
fifo = PacketFifo(10)
assert 1 not in fifo
fifo[1] = 0
assert 1 in fifo
def test_get_index_not_int_raises():
fifo = PacketFifo(10)
with pytest.raises(TypeError):
fifo["test"]
def test_get_missing_from_fifo():
fifo = PacketFifo(10)
with pytest.raises(KeyError):
fifo[123]
def test_add_existing_to_fifo():
fifo = PacketFifo(10)
fifo[123] = 456
with pytest.raises(ValueError):
fifo[123] = 789
def test_repr():
fifo = PacketFifo(2)
assert repr(fifo) == "{}"
fifo[1] = 2
fifo[2] = 3
assert repr(fifo) == "{1: 2, 2: 3}"
def test_str():
fifo = PacketFifo(2)
assert str(fifo) == "[]"
fifo[1] = 2
fifo[2] = 3
assert str(fifo) == "[1, 2]"