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源代码：
roman_mumeral_map = ((‘M‘,1000),
(‘CM‘,900),
(‘D‘,500),
(‘CD‘,400),
(‘C‘,100),
(‘XC‘,90),
(‘L‘,50),
(‘XL‘,40),
(‘X‘,10),
(‘IX‘,9),
(‘V‘,5),
(‘IV‘,4),
(‘I‘,1))
def to_roman(n):
‘‘‘ convert integer to Roman numeral ‘‘‘
if not (0 < n < 4000):
raise OutOfRangeError(‘number out of range (must be less than 4000‘)
result = ‘‘
for numeral, integer in roman_mumeral_map:
while n >= integer:
result += numeral
n -= integer
#print(‘subtracting {0} from input, adding {1} to output‘.format(integer,numeral))
return result
class OutOfRangeError(ValueError):
pass
单元测试代码：
import roman1 import unittest class KnownValue(unittest.TestCase): """docstring for KnownValue""" known_values = ((1,‘I‘), (2,‘II‘), (3,‘III‘), (3888,‘MMMDCCCLXXXVIII‘), (3999,‘MMMCMXCIX‘)) def test_to_roma_konwn_values(self): ‘‘‘ to_roman should give known result with known input ‘‘‘ for integer, numeral in self.known_values: result = roman1.to_roman(integer) self.assertEqual(numeral,result) class ToRomanBadInput(unittest.TestCase): def test_too_large(self): ‘‘‘ to_romam should fail with large input‘‘‘ self.assertRaises(roman1.OutOfRangeError,roman1.to_roman,4000) def test_zero(self): ‘‘‘to_roman should fail with 0 iput ‘‘‘ self.assertRaises(roman1.OutOfRangeError,roman1.to_roman,0) def test_negative(self): ‘‘‘ to_roman should fail with negtive input ‘‘‘ self.assertRaises(roman1.OutOfRangeError, roman1.to_roman, -1) if __name__ == ‘__main__‘: unittest.main()
class KnownValue(unittest.TestCase)： -- 让该测试用例称为unittest模块下TestCase类的子类。
TestCase类提供了assertEqual()方法来检查两个值是否相等.
该模块中的每一个类方法都是一个测试用例，需要继承TestCase类
对于每一个测试用例，unittest模块会打印出每个测试用例的docstring，并说明该测试用例是失败还是成功。对于每一个失败的测试用例，unittest模块会打印出详细跟踪信息。
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原文地址：http://www.cnblogs.com/summerlong/p/4517561.html
