python-unittest(1)

一個非常簡單的python的測試案例，取自電子書：《Python Testing Cookbook》第一章內容，裡面說的足夠簡單明了，將之摘出來，對照代碼，應該很容易理解。

The basic concept of an automated unittest test case is to instantiate part of our code,
subject it to operations, and verify certain results using assertions.
1. If the results are as expected, unittest counts it as a test success
2. If the results don't match, an exception is thrown and unittest counts it as a
test failure
With these steps, we will code a simple program and then write some automated tests
using unittest:

1. Create a new file called recipe1.py in which to put all of this recipe's code. Pick a
class to test. This is known as the class under test. For this recipe, we'll pick a class
that uses a simplistic Roman numeral converter:

2. Write a new class and give it the same name with Test appended to the end,
subclassing unittest.TestCase. Appending a test class with Test is a common
convention, but not a requirement. Extending unittest.TestCase is a requirement
needed to hook into unittest's standard test runner.

3. Create several methods whose names start with test, so they are automatically
picked up by the test number of unittest.

4. Make the entire script runnable and then use unittest's test runner.
if __name__ == "__main__":
unittest.main()

5. Run the file from the command line.

 

附測試代碼：

Code# !usr/bin/env python 2.7# coding: utf-8# filename: recipe1.pyclass 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 valimport unittestclass 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(100, value.convert_to_decimal())    def test_parsing_half_century(self):        value = RomanNumeralConverter("L")        self.assertEquals(50, value.convert_to_decimal())    def test_parsing_decade(self):        value = RomanNumeralConverter("X")        self.assertEquals(10, value.convert_to_decimal())    def test_parsing_half_decade(self):        value = RomanNumeralConverter("V")        self.assertEquals(5, value.convert_to_decimal())    def test_parsing_one(self):        value = RomanNumeralConverter("I")        self.assertEquals(1, value.convert_to_decimal())    def test_empty_roman_numeral(self):        value = RomanNumeralConverter("")        self.assertTrue(value.convert_to_decimal() == 0)        self.assertFalse(value.convert_to_decimal() > 0)    def test_no_roman_numeral(self):        value = RomanNumeralConverter(None)        self.assertRaises(TypeError, value.convert_to_decimal)if __name__ == "__main__":    unittest.main()

運行結果：

........
----------------------------------------------------------------------
Ran 8 tests in 0.001s

OK