def test_add_3():
state = State(c=False)
s = "d=60"
delta = StateDelta.parse(s)
state = delta.apply(state)
assert state.c is False
assert state.d == 0x60
assert delta.encode() == s
def test_combined():
state = State(e=True, b=0x13, d=0x66)
s = "-ed +X"
delta = StateDelta.parse(s)
state = delta.apply(state)
assert state.e is None
assert state.b == 0x13
assert state.d is None
assert state.x is True
assert delta.encode() == "+X -ed"
def test_add_2():
state = State(x=True, b=0xff)
s = "+m b=03 d=a2"
delta = StateDelta.parse(s)
state = delta.apply(state)
assert state.x is True
assert state.m is False
assert state.b == 0x03
assert state.d == 0xa2
assert delta.encode() == s
def test_add_1():
state = State()
for var in ("m", "x", "c", "e", "b", "d"):
assert getattr(state, var) is None
s = "+C"
delta = StateDelta.parse(s)
state = delta.apply(state)
assert state.c is True
for var in ("m", "x", "e", "b", "d"):
assert getattr(state, var) is None
assert delta.encode() == s
def test_clear():
state = State(e=True, m=False, x=True, c=False, b=1, d=2)
s = "-ecd"
delta = StateDelta.parse(s)
state = delta.apply(state)
assert state.e is None
assert state.m is False
assert state.x is True
assert state.c is None
assert state.b == 1
assert state.d is None
assert delta.encode() == s
def test_empty_parse():
with pytest.raises(ValueError):
StateDelta.parse("")
with pytest.raises(ValueError):
StateDelta.parse("Δ")