def test_bitwise_xor_works():
a = BoolArray(bits=[True, False, True, False])
b = BoolArray(bits=[True, False, False, True])
c = a ^ b
d = b ^ a
assert (c.bits == [False, False, True, True])
assert (d.bits == [False, False, True, True])
def test_simplealu_multi_bit_alu_aorb():
control_word = BoolArray(bits=SimpleALU.OR_OPERATION)
a = BoolArray(bits=[True, False, True, False]) # flake8: noqa
b = BoolArray(bits=[True, False, False, True]) # flake8: noqa
aorb = BoolArray(bits=[True, False, True, True]) # flake8: noqa
output = SimpleALU.multi_bit_alu(a, b, control_word)
assert (output == aorb)
def test_bitwise_and_works():
a = BoolArray(bits=[True, False, True, False])
b = BoolArray(bits=[True, False, False, True])
c = a & b
d = b & a
assert (c.bits == [True, False, False, False])
assert (d.bits == [True, False, False, False])
def test_eq_compares_bits():
a = BoolArray(bits=[True, False])
b = BoolArray(bits=[True, False])
c = BoolArray(bits=[False, True])
assert (a == b)
assert (b != c)
assert (a != c)
def test_simplealu_multi_bit_alu_not_b():
control_word = BoolArray(bits=SimpleALU.NOTB_OPERATION)
a = BoolArray(bits=[False, False, False, False]) # flake8: noqa
b = BoolArray(bits=[True, False, True, False]) # flake8: noqa
notb = BoolArray(bits=[False, True, False, True]) # flake8: noqa
output = SimpleALU.multi_bit_alu(a, b, control_word)
assert (output == notb)
def test_should_allow_size_1_to_size_MAX_BITS_SIZE_bits():
try:
for i in range(1, MAX_BITS_SIZE + 1):
BoolArray(size=i)
except AssertionError:
pytest.fail(
"Creating BoolArray size {} raised AssertionError".format(i))
def multi_bit_alu(a, b, cw):
"""
Run Single Stage ALU for each bit in registers
a, b and return output using control word cw
:param a: Register A
:param b: Register B
:param cw: Operation Output
:return: BoolArray
"""
assert (issubclass(type(a), BoolArray)
and issubclass(type(b), BoolArray))
assert (a.size == b.size)
cin = False
output = []
for ba, bb in zip(a.lowhighbits, b.lowhighbits):
cout, s, aab, aob, a, notb = SimpleALU.single_bit_alu(ba, bb, cin)
out = SimpleALU.multiplex_output(cw.bits, s, aab, aob, a, notb)
output.append(out)
cin = cout
# F(A, B, C) = (D, E)
# ([A], [B], 0) => F => [E]
# We added the bits low to high, but it's stored high to low
output.reverse()
return BoolArray(bits=output)
def test_bitwise_and_pads_high_order_bits_if_one_boolarray_larger_than_other():
a = BoolArray(bits=[True, False, True, False, True])
# False,
b = BoolArray(bits=[True, False, False, True])
c = a & b
assert (c.bits == [False, False, False, False, True])
def test_bitwise_and_works_with_boolean_list():
a = BoolArray(bits=[True, False, True, False])
b = [True, False, False, True]
c = a & b
assert (c.bits == [True, False, False, False])
def test_repr_shows_bits_right_to_left():
b = BoolArray(bits=[True, False, True, False])
assert (str(b) == "1,0,1,0")
def test_should_throw_exception_size_less_than_1():
pytest.raises(AssertionError, lambda: BoolArray(size=0))
def test_invert_bits():
a = BoolArray(bits=[True, False, True, False])
a = ~a
assert (a == [False, True, False, True])
def test_bits_from_integer():
a = BoolArray(size=MAX_BITS_SIZE)
a.bits[-2] = True
b = BoolArray(integer=2)
assert (a == b)
def test_should_throw_exception_if_bits_length_less_that_1():
pytest.raises(AssertionError, lambda: BoolArray(bits=[]))
def test_should_throw_exception_if_bits_not_list_of_booleans():
pytest.raises(AssertionError, lambda: BoolArray(bits=["not", "booleans"]))
def test_should_throw_exception_size_greater_than_MAX_BITS_SIZE():
pytest.raises(AssertionError, lambda: BoolArray(size=MAX_BITS_SIZE + 1))
def test_simplealu_multi_bit_alu_add():
control_word = BoolArray(bits=SimpleALU.ADD_OPERATION)
a = BoolArray(integer=40) # 101000
b = BoolArray(integer=2) # 000010
output = SimpleALU.multi_bit_alu(a, b, control_word)
assert (output == 42) # 101010
def test_eq_undefined():
a = BoolArray(bits=[True, False])
pytest.raises(ValueError, lambda: a == "[True, False]")
def test_eq_integer():
a = BoolArray(bits=[True, False])
assert (a == 2)
def test_convert_to_integer_properly():
a = BoolArray(bits=[True, False, False, False])
assert (a == 8)
