mirror of https://github.com/django/django.git
179 lines
7.3 KiB
Python
179 lines
7.3 KiB
Python
from decimal import Decimal
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from sys import float_info
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from django.test import SimpleTestCase
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from django.utils.numberformat import format as nformat
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class TestNumberFormat(SimpleTestCase):
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def test_format_number(self):
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self.assertEqual(nformat(1234, "."), "1234")
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self.assertEqual(nformat(1234.2, "."), "1234.2")
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self.assertEqual(nformat(1234, ".", decimal_pos=2), "1234.00")
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self.assertEqual(nformat(1234, ".", grouping=2, thousand_sep=","), "1234")
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self.assertEqual(
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nformat(1234, ".", grouping=2, thousand_sep=",", force_grouping=True),
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"12,34",
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)
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self.assertEqual(nformat(-1234.33, ".", decimal_pos=1), "-1234.3")
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# The use_l10n parameter can force thousand grouping behavior.
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with self.settings(USE_THOUSAND_SEPARATOR=True):
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self.assertEqual(
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nformat(1234, ".", grouping=3, thousand_sep=",", use_l10n=False), "1234"
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)
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self.assertEqual(
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nformat(1234, ".", grouping=3, thousand_sep=",", use_l10n=True), "1,234"
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)
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def test_format_string(self):
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self.assertEqual(nformat("1234", "."), "1234")
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self.assertEqual(nformat("1234.2", "."), "1234.2")
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self.assertEqual(nformat("1234", ".", decimal_pos=2), "1234.00")
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self.assertEqual(nformat("1234", ".", grouping=2, thousand_sep=","), "1234")
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self.assertEqual(
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nformat("1234", ".", grouping=2, thousand_sep=",", force_grouping=True),
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"12,34",
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)
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self.assertEqual(nformat("-1234.33", ".", decimal_pos=1), "-1234.3")
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self.assertEqual(
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nformat(
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"10000", ".", grouping=3, thousand_sep="comma", force_grouping=True
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),
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"10comma000",
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)
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def test_large_number(self):
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most_max = (
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"{}179769313486231570814527423731704356798070567525844996"
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"598917476803157260780028538760589558632766878171540458953"
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"514382464234321326889464182768467546703537516986049910576"
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"551282076245490090389328944075868508455133942304583236903"
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"222948165808559332123348274797826204144723168738177180919"
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"29988125040402618412485836{}"
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)
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most_max2 = (
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"{}35953862697246314162905484746340871359614113505168999"
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"31978349536063145215600570775211791172655337563430809179"
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"07028764928468642653778928365536935093407075033972099821"
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"15310256415249098018077865788815173701691026788460916647"
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"38064458963316171186642466965495956524082894463374763543"
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"61838599762500808052368249716736"
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)
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int_max = int(float_info.max)
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self.assertEqual(nformat(int_max, "."), most_max.format("", "8"))
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self.assertEqual(nformat(int_max + 1, "."), most_max.format("", "9"))
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self.assertEqual(nformat(int_max * 2, "."), most_max2.format(""))
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self.assertEqual(nformat(0 - int_max, "."), most_max.format("-", "8"))
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self.assertEqual(nformat(-1 - int_max, "."), most_max.format("-", "9"))
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self.assertEqual(nformat(-2 * int_max, "."), most_max2.format("-"))
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def test_float_numbers(self):
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tests = [
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(9e-10, 10, "0.0000000009"),
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(9e-19, 2, "0.00"),
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(0.00000000000099, 0, "0"),
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(0.00000000000099, 13, "0.0000000000009"),
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(1e16, None, "10000000000000000"),
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(1e16, 2, "10000000000000000.00"),
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# A float without a fractional part (3.) results in a ".0" when no
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# decimal_pos is given. Contrast that with the Decimal('3.') case
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# in test_decimal_numbers which doesn't return a fractional part.
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(3.0, None, "3.0"),
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]
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for value, decimal_pos, expected_value in tests:
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with self.subTest(value=value, decimal_pos=decimal_pos):
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self.assertEqual(nformat(value, ".", decimal_pos), expected_value)
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# Thousand grouping behavior.
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self.assertEqual(
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nformat(1e16, ".", thousand_sep=",", grouping=3, force_grouping=True),
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"10,000,000,000,000,000",
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)
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self.assertEqual(
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nformat(
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1e16,
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".",
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decimal_pos=2,
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thousand_sep=",",
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grouping=3,
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force_grouping=True,
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),
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"10,000,000,000,000,000.00",
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)
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def test_decimal_numbers(self):
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self.assertEqual(nformat(Decimal("1234"), "."), "1234")
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self.assertEqual(nformat(Decimal("1234.2"), "."), "1234.2")
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self.assertEqual(nformat(Decimal("1234"), ".", decimal_pos=2), "1234.00")
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self.assertEqual(
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nformat(Decimal("1234"), ".", grouping=2, thousand_sep=","), "1234"
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)
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self.assertEqual(
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nformat(
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Decimal("1234"), ".", grouping=2, thousand_sep=",", force_grouping=True
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),
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"12,34",
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)
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self.assertEqual(nformat(Decimal("-1234.33"), ".", decimal_pos=1), "-1234.3")
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self.assertEqual(
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nformat(Decimal("0.00000001"), ".", decimal_pos=8), "0.00000001"
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)
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self.assertEqual(nformat(Decimal("9e-19"), ".", decimal_pos=2), "0.00")
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self.assertEqual(nformat(Decimal(".00000000000099"), ".", decimal_pos=0), "0")
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self.assertEqual(
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nformat(
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Decimal("1e16"), ".", thousand_sep=",", grouping=3, force_grouping=True
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),
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"10,000,000,000,000,000",
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)
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self.assertEqual(
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nformat(
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Decimal("1e16"),
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".",
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decimal_pos=2,
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thousand_sep=",",
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grouping=3,
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force_grouping=True,
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),
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"10,000,000,000,000,000.00",
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)
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self.assertEqual(nformat(Decimal("3."), "."), "3")
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self.assertEqual(nformat(Decimal("3.0"), "."), "3.0")
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# Very large & small numbers.
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tests = [
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("9e9999", None, "9e+9999"),
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("9e9999", 3, "9.000e+9999"),
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("9e201", None, "9e+201"),
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("9e200", None, "9e+200"),
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("1.2345e999", 2, "1.23e+999"),
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("9e-999", None, "9e-999"),
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("1e-7", 8, "0.00000010"),
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("1e-8", 8, "0.00000001"),
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("1e-9", 8, "0.00000000"),
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("1e-10", 8, "0.00000000"),
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("1e-11", 8, "0.00000000"),
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("1" + ("0" * 300), 3, "1.000e+300"),
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("0.{}1234".format("0" * 299), 3, "0.000"),
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]
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for value, decimal_pos, expected_value in tests:
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with self.subTest(value=value):
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self.assertEqual(
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nformat(Decimal(value), ".", decimal_pos), expected_value
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)
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def test_decimal_subclass(self):
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class EuroDecimal(Decimal):
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"""
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Wrapper for Decimal which prefixes each amount with the € symbol.
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"""
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def __format__(self, specifier, **kwargs):
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amount = super().__format__(specifier, **kwargs)
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return "€ {}".format(amount)
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price = EuroDecimal("1.23")
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self.assertEqual(nformat(price, ","), "€ 1,23")
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def test_empty(self):
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self.assertEqual(nformat("", "."), "")
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self.assertEqual(nformat(None, "."), "None")
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