python-unittest(6)

在测试模块中定义测试套件

Defining test suites inside the test module.

Each test module can provide one or more methods that define a different test suite. One
method can exercise all the tests in a given module; another method can define a particular
subset.

1. Create a new file called recipe6.py in which to put our code for this recipe.

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. Write a series of test methods, including a setUp method that creates a new
instance of the RomanNumeralConverter for each test method.

5. Create some methods in the recipe’s module (but not in the test case) that define
different test suites.

6. Create a runner that will iterate over each of these test suites and run them through
unittest’s TextTestRunner.

7. Run the combination of test suites, and see the results.

测试代码：

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

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

import unittest

class RomanNumeralConverterTest(unittest.TestCase):
    def setUp(self):
        self.cvt = RomanNumeralConverter()

    def test_parsing_millenia(self):
        self.assertEquals(1000, \
                          self.cvt.convert_to_decimal("M"))

    def test_parsing_century(self):
        self.assertEquals(100, \
                          self.cvt.convert_to_decimal("C"))

    def test_parsing_half_century(self):
        self.assertEquals(50, \
                          self.cvt.convert_to_decimal("L"))

    def test_parsing_decade(self):
        self.assertEquals(10, \
                          self.cvt.convert_to_decimal("X"))

    def test_parsing_half_decade(self):
        self.assertEquals(5, self.cvt.convert_to_decimal("V"))

    def test_parsing_one(self):
        self.assertEquals(1, self.cvt.convert_to_decimal("I"))

    def test_empty_roman_numeral(self):
        self.assertTrue(self.cvt.convert_to_decimal("") == 0)
        self.assertFalse(self.cvt.convert_to_decimal("") > 0)

    def test_no_roman_numeral(self):
        self.assertRaises(TypeError, \
                          self.cvt.convert_to_decimal, None)

    def test_combo1(self):
        self.assertEquals(4000, \
                          self.cvt.convert_to_decimal("MMMM"))

    def test_combo2(self):
        self.assertEquals(2010, \
                          self.cvt.convert_to_decimal("MMX"))

    def test_combo3(self):
        self.assertEquals(4668, \
                self.cvt.convert_to_decimal("MMMMDCLXVIII"))

def high_and_low():
    suite = unittest.TestSuite()
    suite.addTest(\
       RomanNumeralConverterTest("test_parsing_millenia"))
    suite.addTest(\
       RomanNumeralConverterTest("test_parsing_one"))
    return suite

def combos():
    return unittest.TestSuite(map(RomanNumeralConverterTest,\
              ["test_combo1", "test_combo2", "test_combo3"]))

def all():
    return unittest.TestLoader().loadTestsFromTestCase(\
                               RomanNumeralConverterTest)

if __name__ == "__main__":
    for suite_func in [high_and_low, combos, all]:
        print "Running test suite '%s'" % suite_func.func_name
        suite = suite_func()
        unittest.TextTestRunner(verbosity=2).run(suite)

输出结果：

Running test suite ‘high_and_low’
test_parsing_millenia (__main__.RomanNumeralConverterTest) … ok
test_parsing_one (__main__.RomanNumeralConverterTest) … ok

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

OK
Running test suite ‘combos’
test_combo1 (__main__.RomanNumeralConverterTest) … ok
test_combo2 (__main__.RomanNumeralConverterTest) … ok
test_combo3 (__main__.RomanNumeralConverterTest) … ok

———————————————————————-
Ran 3 tests in 0.000s

OK
Running test suite ‘all’
test_combo1 (__main__.RomanNumeralConverterTest) … ok
test_combo2 (__main__.RomanNumeralConverterTest) … ok
test_combo3 (__main__.RomanNumeralConverterTest) … ok
test_empty_roman_numeral (__main__.RomanNumeralConverterTest) … ok
test_no_roman_numeral (__main__.RomanNumeralConverterTest) … ok
test_parsing_century (__main__.RomanNumeralConverterTest) … ok
test_parsing_decade (__main__.RomanNumeralConverterTest) … ok
test_parsing_half_century (__main__.RomanNumeralConverterTest) … ok
test_parsing_half_decade (__main__.RomanNumeralConverterTest) … ok
test_parsing_millenia (__main__.RomanNumeralConverterTest) … ok
test_parsing_one (__main__.RomanNumeralConverterTest) … ok

———————————————————————-
Ran 11 tests in 0.001s

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