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import itertools
import cocotb
from cocotb.clock import Clock
from cocotb.triggers import Timer
@cocotb.test()
def test_adder3_reg(dut):
cocotb.fork(Clock(dut.clk, 10, units='ns').start())
yield Timer(5, units='ns')
for b, a in itertools.product(range(2 ** 3), repeat=2):
dut.a = a
dut.b = b
yield Timer(10, units='ns')
z = a + b
assert z == dut.z