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"""
B-ASIC test suit for the signal module which consists of the Signal class.
"""
from b_asic.port import InputPort, OutputPort
from b_asic.signal import Signal
import pytest
def test_signal_creation_and_disconnction_and_connection_changing():
in_port = InputPort(0, None)
out_port = OutputPort(1, None)
s = Signal(out_port, in_port)
assert in_port.signals == [s]
assert out_port.signals == [s]
assert s.source is out_port
assert s.destination is in_port
in_port1 = InputPort(0, None)
s.set_destination(in_port1)
assert in_port.signals == []
assert in_port1.signals == [s]
assert out_port.signals == [s]
assert s.source is out_port
assert s.destination is in_port1
s.remove_source()
assert out_port.signals == []
assert in_port1.signals == [s]
assert s.source is None
assert s.destination is in_port1
s.remove_destination()
assert out_port.signals == []
assert in_port1.signals == []
assert s.source is None
assert s.destination is None
out_port1 = OutputPort(0, None)
s.set_source(out_port1)
assert out_port1.signals == [s]
assert s.source is out_port1
assert s.destination is None
s.set_source(out_port)
assert out_port.signals == [s]
assert out_port1.signals == []
assert s.source is out_port
assert s.destination is None
s.set_destination(in_port)
assert out_port.signals == [s]
assert in_port.signals == [s]
assert s.source is out_port
assert s.destination is in_port