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# -*- coding: utf-8 -*-
# Part of Odoo. See LICENSE file for full copyright and licensing details.
from math import log10
from odoo.tests.common import TransactionCase
from odoo.tools import float_compare, float_is_zero, float_repr, float_round
class TestFloatPrecision(TransactionCase):
""" Tests on float precision. """
def test_rounding_02(self):
""" Test rounding methods with 2 digits. """
currency = self.env.ref('base.EUR')
def try_round(amount, expected):
digits = max(0, -int(log10(currency.rounding)))
result = float_repr(currency.round(amount), precision_digits=digits)
self.assertEqual(result, expected, 'Rounding error: got %s, expected %s' % (result, expected))
try_round(2.674,'2.67')
try_round(2.675,'2.68') # in Python 2.7.2, round(2.675,2) gives 2.67
try_round(-2.675,'-2.68') # in Python 2.7.2, round(2.675,2) gives 2.67
try_round(0.001,'0.00')
try_round(-0.001,'-0.00')
try_round(0.0049,'0.00') # 0.0049 is closer to 0 than to 0.01, so should round down
try_round(0.005,'0.01') # the rule is to round half away from zero
try_round(-0.005,'-0.01') # the rule is to round half away from zero
def try_zero(amount, expected):
self.assertEqual(currency.is_zero(amount), expected,
"Rounding error: %s should be zero!" % amount)
try_zero(0.01, False)
try_zero(-0.01, False)
try_zero(0.001, True)
try_zero(-0.001, True)
try_zero(0.0046, True)
try_zero(-0.0046, True)
try_zero(2.68-2.675, False) # 2.68 - 2.675 = 0.005 -> rounds to 0.01
try_zero(2.68-2.676, True) # 2.68 - 2.675 = 0.004 -> rounds to 0.0
try_zero(2.676-2.68, True) # 2.675 - 2.68 = -0.004 -> rounds to -0.0
try_zero(2.675-2.68, False) # 2.675 - 2.68 = -0.005 -> rounds to -0.01
def try_compare(amount1, amount2, expected):
self.assertEqual(currency.compare_amounts(amount1, amount2), expected,
"Rounding error, compare_amounts(%s,%s) should be %s" % (amount1, amount2, expected))
try_compare(0.001, 0.001, 0)
try_compare(-0.001, -0.001, 0)
try_compare(0.001, 0.002, 0)
try_compare(-0.001, -0.002, 0)
try_compare(2.675, 2.68, 0)
try_compare(2.676, 2.68, 0)
try_compare(-2.676, -2.68, 0)
try_compare(2.674, 2.68, -1)
try_compare(-2.674, -2.68, 1)
try_compare(3, 2.68, 1)
try_compare(-3, -2.68, -1)
try_compare(0.01, 0, 1)
try_compare(-0.01, 0, -1)
def test_rounding_03(self):
""" Test rounding methods with 3 digits. """
def try_round(amount, expected, digits=3, method='HALF-UP'):
value = float_round(amount, precision_digits=digits, rounding_method=method)
result = float_repr(value, precision_digits=digits)
self.assertEqual(result, expected, 'Rounding error: got %s, expected %s' % (result, expected))
try_round(2.6745, '2.675')
try_round(-2.6745, '-2.675')
try_round(2.6744, '2.674')
try_round(-2.6744, '-2.674')
try_round(0.0004, '0.000')
try_round(-0.0004, '-0.000')
try_round(357.4555, '357.456')
try_round(-357.4555, '-357.456')
try_round(457.4554, '457.455')
try_round(-457.4554, '-457.455')
# Try some rounding value with rounding method UP instead of HALF-UP
# We use 8.175 because when normalizing 8.175 with precision_digits=3 it gives
# us 8175,0000000001234 as value, and if not handle correctly the rounding UP
# value will be incorrect (should be 8,175 and not 8,176)
try_round(8.175, '8.175', method='UP')
try_round(8.1751, '8.176', method='UP')
try_round(-8.175, '-8.175', method='UP')
try_round(-8.1751, '-8.176', method='UP')
try_round(-6.000, '-6.000', method='UP')
try_round(1.8, '2', 0, method='UP')
try_round(-1.8, '-2', 0, method='UP')
# Extended float range test, inspired by Cloves Almeida's test on bug #882036.
fractions = [.0, .015, .01499, .675, .67499, .4555, .4555, .45555]
expecteds = ['.00', '.02', '.01', '.68', '.67', '.46', '.456', '.4556']
precisions = [2, 2, 2, 2, 2, 2, 3, 4]
# Note: max precision for double floats is 53 bits of precision or
# 17 significant decimal digits
for magnitude in range(7):
for i in xrange(len(fractions)):
frac, exp, prec = fractions[i], expecteds[i], precisions[i]
for sign in [-1,1]:
for x in xrange(0,10000,97):
n = x * 10**magnitude
f = sign * (n + frac)
f_exp = ('-' if f != 0 and sign == -1 else '') + str(n) + exp
try_round(f, f_exp, digits=prec)
def try_zero(amount, expected):
self.assertEqual(float_is_zero(amount, precision_digits=3), expected,
"Rounding error: %s should be zero!" % amount)
try_zero(0.0002, True)
try_zero(-0.0002, True)
try_zero(0.00034, True)
try_zero(0.0005, False)
try_zero(-0.0005, False)
try_zero(0.0008, False)
try_zero(-0.0008, False)
def try_compare(amount1, amount2, expected):
self.assertEqual(float_compare(amount1, amount2, precision_digits=3), expected,
"Rounding error, compare_amounts(%s,%s) should be %s" % (amount1, amount2, expected))
try_compare(0.0003, 0.0004, 0)
try_compare(-0.0003, -0.0004, 0)
try_compare(0.0002, 0.0005, -1)
try_compare(-0.0002, -0.0005, 1)
try_compare(0.0009, 0.0004, 1)
try_compare(-0.0009, -0.0004, -1)
try_compare(557.4555, 557.4556, 0)
try_compare(-557.4555, -557.4556, 0)
try_compare(657.4444, 657.445, -1)
try_compare(-657.4444, -657.445, 1)
# Rounding to unusual rounding units (e.g. coin values)
def try_round(amount, expected, precision_rounding=None):
value = float_round(amount, precision_rounding=precision_rounding)
result = float_repr(value, precision_digits=2)
self.assertEqual(result, expected, 'Rounding error: got %s, expected %s' % (result, expected))
try_round(-457.4554, '-457.45', precision_rounding=0.05)
try_round(457.444, '457.50', precision_rounding=0.5)
try_round(457.3, '455.00', precision_rounding=5)
try_round(457.5, '460.00', precision_rounding=5)
try_round(457.1, '456.00', precision_rounding=3)
def test_rounding_04(self):
""" check that proper rounding is performed for float persistence """
currency = self.env.ref('base.EUR')
currency_rate = self.env['res.currency.rate']
def try_roundtrip(value, expected):
rate = currency_rate.create({'name':'2000-01-01',
'rate': value,
'currency_id': currency.id})
self.assertEqual(rate.rate, expected,
'Roundtrip error: got %s back from db, expected %s' % (rate, expected))
# res.currency.rate uses 6 digits of precision by default
try_roundtrip(2.6748955, 2.674896)
try_roundtrip(-2.6748955, -2.674896)
try_roundtrip(10000.999999, 10000.999999)
try_roundtrip(-10000.999999, -10000.999999)
def test_rounding_invalid(self):
""" verify that invalid parameters are forbidden """
with self.assertRaises(AssertionError):
float_is_zero(0.01, precision_digits=3, precision_rounding=0.01)
with self.assertRaises(AssertionError):
float_compare(0.01, 0.02, precision_digits=3, precision_rounding=0.01)
with self.assertRaises(AssertionError):
float_round(0.01, precision_digits=3, precision_rounding=0.01)