pythonunittest(3)

Running test cases from the command line with increased verbosity.
It is easy to adjust the test runner to print out every test method as it is run.
1. Create a new file called recipe3.py in which to store this recipe's code.

2. Pick a class to test. In this case, we will use our Roman numeral converter:

3. Create a test class using the same name as the class under test with Test appended
to the end.

4. Create several test methods. For this recipe, the tests have been deliberately
coded to fail.

5. Define a test suite that automatically loads all the test methods, and then runs
them with a higher level of verbosity.
if __name__ == "__main__":
suite = unittest.TestLoader().loadTestsFromTestCase( \
RomanNumeralConverterTest)
unittest.TextTestRunner(verbosity=2).run(suite)

6. Run the file from the command line. Notice how the test method that fails
prints out its Python docstring:

测试代码：

# !usr/bin/env python 2.7
# coding: utf-8
# filename: recipe3.py

class RomanNumeralConverter(object):
    def __init__(self, roman_numeral):
        self.roman_numeral = roman_numeral
        self.digit_map = {"M":1000, "D":500, "C":100, "L":50, "X":10, "V":5, "I":1}

    def convert_to_decimal(self):
        val = 0
        for char in self.roman_numeral:
            val += self.digit_map[char]
        return val

import unittest

class RomanNumeralConverterTest(unittest.TestCase):
    def test_parsing_millenia(self):
        value = RomanNumeralConverter("M")
        self.assertEquals(1000, value.convert_to_decimal())

    def test_parsing_century(self):
        value = RomanNumeralConverter("C")
        self.assertEquals(10, value.convert_to_decimal(), "This test method is coded to fail for demo.")


if __name__ == "__main__":
    suite = unittest.TestLoader().loadTestsFromTestCase( \
                                 RomanNumeralConverterTest)
    unittest.TextTestRunner(verbosity=2).run(suite)

输出结果：

test_parsing_century (__main__.RomanNumeralConverterTest) ... FAIL
test_parsing_millenia (__main__.RomanNumeralConverterTest) ... ok

======================================================================
FAIL: test_parsing_century (__main__.RomanNumeralConverterTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "e:\study\python\4668_Code\Chapter 1\01\recipe3.py", line 25, in test_parsing_century
    self.assertEquals(10, value.convert_to_decimal(), "This test method is coded to fail for demo.")
AssertionError: This test method is coded to fail for demo.

----------------------------------------------------------------------
Ran 2 tests in 0.000s

FAILED (failures=1)