def test_converts_floats_to_decimals_exactly():
dec = as_decimal(24.390015)
# due to float imprecision, will be 24.39001599999...
assert dec != Decimal(24.390015)
# will be precisely 24.390015
assert dec == Decimal('24.390015')
def test_parses_strings():
dec = as_decimal('12.345')
assert dec == Decimal('12.345')
def test_handles_None():
assert as_decimal(None) is None
def test_handles_empty_strings():
assert as_decimal("") is None
def test_handles_0():
assert as_decimal(0.0) == Decimal("0.0")
def test_parses_strings():
assert as_decimal("12.345") == Decimal("12.345")