Created
November 3, 2011 11:15
-
-
Save playpauseandstop/1336277 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
import unittest | |
from decimal import Decimal | |
from random import randint | |
class TestRandDecimal(unittest.TestCase): | |
def check(self, a, b): | |
value = randdecimal(a, b) | |
self.assertTrue(Decimal(a) <= value <= Decimal(b), | |
'not %r <= %r <= %r' % (a, value, b)) | |
def test_result(self): | |
self.check(0, 10) | |
self.check('0.13', '0.20') | |
self.check(Decimal('5.33'), 10) | |
self.check(0, Decimal('5.33')) | |
self.check(Decimal('0.135'), Decimal('0.2')) | |
def test_same(self): | |
self.assertEqual(randdecimal(0, 0), 0) | |
self.assertEqual(randdecimal('0.2', '.2'), Decimal('.2')) | |
self.assertEqual(randdecimal(10, Decimal('10.00')), Decimal('10')) | |
def test_value_error(self): | |
self.assertRaises(ValueError, randdecimal, 10, 0) | |
self.assertRaises(ValueError, randdecimal, '0.2', '0.135') | |
self.assertRaises(ValueError, | |
randdecimal, | |
Decimal(10), | |
Decimal('5.33')) | |
def randdecimal(a, b): | |
""" | |
Return a random decimal N such that a <= N <= b. | |
""" | |
a, b = Decimal(a), Decimal(b) | |
diff = b - a | |
multiplier = pow(10, abs(diff.as_tuple()[2])) | |
diff_to_int = int(diff * multiplier) | |
return a + Decimal(randint(0, diff_to_int)) / multiplier | |
if __name__ == '__main__': | |
unittest.main() |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment