def test_encode_signed_real(base_integer_value,
value_bit_size,
high_bit_size,
low_bit_size,
data_byte_size):
if value_bit_size > data_byte_size * 8:
with pytest.raises(ValueError):
SignedRealEncoder.as_encoder(
value_bit_size=value_bit_size,
high_bit_size=high_bit_size,
low_bit_size=low_bit_size,
data_byte_size=data_byte_size,
)
return
elif high_bit_size + low_bit_size != value_bit_size:
with pytest.raises(ValueError):
SignedRealEncoder.as_encoder(
value_bit_size=value_bit_size,
high_bit_size=high_bit_size,
low_bit_size=low_bit_size,
data_byte_size=data_byte_size,
)
return
encoder = SignedRealEncoder.as_encoder(
value_bit_size=value_bit_size,
high_bit_size=high_bit_size,
low_bit_size=low_bit_size,
data_byte_size=data_byte_size,
)
if not is_number(base_integer_value):
with pytest.raises(EncodingTypeError) as exception_info:
encoder(base_integer_value)
assert 'SignedReal' in str(exception_info.value)
return
unsigned_integer_value = base_integer_value % 2**(high_bit_size + low_bit_size)
with decimal.localcontext(abi_decimal_context):
real_value = decimal.Decimal(unsigned_integer_value) / 2 ** low_bit_size
lower_bound, upper_bound = compute_signed_real_bounds(
high_bit_size,
low_bit_size,
)
if real_value < lower_bound or real_value > upper_bound:
with pytest.raises(ValueOutOfBounds):
encoder(real_value)
return
expected_value = zpad(int_to_big_endian(unsigned_integer_value), data_byte_size)
encoded_value = encoder(real_value)
assert encoded_value == expected_value
def bounds_fn(self, value_bit_size):
return compute_signed_real_bounds(self.high_bit_size,
self.low_bit_size)
def bounds_fn(cls, value_bit_size):
return compute_signed_real_bounds(cls.high_bit_size, cls.low_bit_size)
