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from b_asic.signal_generator import Constant, Impulse, Step
def test_impulse():
g = Impulse()
assert g(0) == 1
assert g(1) == 0
assert g(2) == 0
g = Impulse(1)
assert g(0) == 0
assert g(1) == 1
assert g(2) == 0
def test_step():
g = Step()
assert g(0) == 1
assert g(1) == 1
assert g(2) == 1
g = Step(1)
assert g(0) == 0
assert g(1) == 1
assert g(2) == 1
def test_constant():
g = Constant()
assert g(0) == 1
assert g(1) == 1
assert g(2) == 1
g = Constant(0.5)
assert g(0) == 0.5
assert g(1) == 0.5
assert g(2) == 0.5
def test_addition():
g = Impulse() + Impulse(2)
assert g(0) == 1
assert g(1) == 0
assert g(2) == 1
assert g(3) == 0
g = 1 + Impulse(2)
assert g(0) == 1
assert g(1) == 1
assert g(2) == 2
assert g(3) == 1
g = Impulse(1) + 1
assert g(0) == 1
assert g(1) == 2
assert g(2) == 1
assert g(3) == 1
def test_subtraction():
g = Impulse() - Impulse(2)
assert g(0) == 1
assert g(1) == 0
assert g(2) == -1
assert g(3) == 0
g = 1 - Impulse(2)
assert g(0) == 1
assert g(1) == 1
assert g(2) == 0
assert g(3) == 1
g = Impulse(2) - 1
assert g(0) == -1
assert g(1) == -1
assert g(2) == 0
assert g(3) == -1
def test_multiplication():
g = Impulse() * 0.5
assert g(0) == 0.5
assert g(1) == 0
assert g(2) == 0