unittest单元测试框架教程2-通过TestLoader运行用例

'''testmath.py'''

import unittest
import ddt


def jiafa(a,b):
    if type(a) is str or type(b) is str:
        return str(a) + str(b)
    return a+b

def chengfa(a,b):
    if type(a) is str or type(b) is str:
        return 0
    return a*b

testdata = [{'a':1,'b':1,'jiafa':2,'chengfa':1},
            {'a':'a','b':1,'jiafa':'a1','chengfa':'a'},
            {'a':'a','b':'b','jiafa':'ab','chengfa':'ab'}]

@ddt.ddt
class TestMath(unittest.TestCase):
    def setUp(self):
        pass

    def tearDown(self):
        pass

    @ddt.data(*testdata)
    def test_jiafa(self,data):
        '''测试加法程序'''
        try:
            self.assertEqual(jiafa(data['a'],data['b']),data['jiafa'])
            print(str(data['a']) + '+' + str(data['b']) + '=' + str(data['jiafa']))
        except Exception as e:
            print(str(data['a']) + '+' + str(data['b']) + '=' + str(data['jiafa'] + ' X'))
            raise e

    @ddt.data(*testdata)
    def test_chengfa(self,data):
        '''测试乘法程序'''
        try:
            self.assertEqual(chengfa(data['a'],data['b']),data['chengfa'])
            print(str(data['a']) + '*' + str(data['b']) + '=' + str(data['chengfa']))
        except Exception as e:
            print(str(data['a']) + '*' + str(data['b']) + '=' + str(data['chengfa'] + ' X'))
            raise e

if __name__ == '__main__':
    unittest.main()

loadTestsFromTestCase(testCaseClass)

返回一个套件中包含的所有测试用例，将为每个由test开头的方法创建一个测试用例实例。

import unittest
import testmath
testsuite = unittest.TestLoader().loadTestsFromTestCase(testmath.TestMath)
print(testsuite)

发现返回的对象为<unittest.suite.TestSuite tests=[<testmath.TestMath testMethod=test_chengfa_1>, <testmath.TestMath testMethod=test_chengfa_2>, <testmath.TestMath testMethod=test_chengfa_3>, <testmath.TestMath testMethod=test_jiafa_1>, <testmath.TestMath testMethod=test_jiafa_2>, <testmath.TestMath testMethod=test_jiafa_3>]>

loadTestsFromModule(module，pattern = None)

返回给定模块中包含的所有测试用例的套件。

testsuite = unittest.TestLoader().loadTestsFromModule(testmath)
print(testsuite)

发现返回的对象为<unittest.suite.TestSuite tests=[<unittest.suite.TestSuite tests=[<testmath.TestMath testMethod=test_chengfa_1>, <testmath.TestMath testMethod=test_chengfa_2>, <testmath.TestMath testMethod=test_chengfa_3>, <testmath.TestMath testMethod=test_jiafa_1>, <testmath.TestMath testMethod=test_jiafa_2>, <testmath.TestMath testMethod=test_jiafa_3>]>]>

loadTestsFromName(name，module = None)

按照“模块名.类名.方法名”输入字符串，返回测试用例的套件。

例如'testmath'将使该方法返回3个套件。

例如'testmath.TestAdd'和"testmath.TestAdd.test_add"将使该方法返回一个套件，该套件将运行test_add。

loader = unittest.TestLoader()

testsuite = loader.loadTestsFromName('testmath')
print(testsuite)
print('
')
testsuite = loader.loadTestsFromName('testmath.TestMath')
print(testsuite)
print('
')
testsuite = loader.loadTestsFromName('testmath.TestMath.test_jiafa')
print(testsuite)
print('
')

发现返回的对象为

<unittest.suite.TestSuite tests=[<unittest.suite.TestSuite tests=[<testmath.TestMath testMethod=test_chengfa_1>, <testmath.TestMath testMethod=test_chengfa_2>, <testmath.TestMath testMethod=test_chengfa_3>, <testmath.TestMath testMethod=test_jiafa_1>, <testmath.TestMath testMethod=test_jiafa_2>, <testmath.TestMath testMethod=test_jiafa_3>]>]>

<unittest.suite.TestSuite tests=[<testmath.TestMath testMethod=test_chengfa_1>, <testmath.TestMath testMethod=test_chengfa_2>, <testmath.TestMath testMethod=test_chengfa_3>, <testmath.TestMath testMethod=test_jiafa_1>, <testmath.TestMath testMethod=test_jiafa_2>, <testmath.TestMath testMethod=test_jiafa_3>]>

<unittest.suite.TestSuite tests=[<unittest.loader._FailedTest testMethod=test_jiafa>]>

getTestCaseNames(testCaseClass)

返回测试类的所有方法名的排序序列，即测试顺序

loader = unittest.TestLoader()

name = loader.getTestCaseNames(testmath.TestMath)

print(name)

返回所有的.TestAdd方法名['test_chengfa_1', 'test_chengfa_2', 'test_chengfa_3', 'test_jiafa_1', 'test_jiafa_2', 'test_jiafa_3']

discover(start_dir，pattern ='test * .py'，top_level_dir = None )

同之前介绍的 命令行参数的discover作用相同，通过从指定的起始目录递归到子目录中，找到所有测试模块，然后返回包含它们的TestSuite对象。

参数testMethodPrefix

字符串，修改默认查找的测试匹配开头的字符串。默认值为'test'。影响getTestCaseNames()所有loadTestsFrom*() 方法

loader = unittest.TestLoader()
loader.testMethodPrefix = 'test_j'
name = loader.loadTestsFromModule(testmath)
print(name)

返回的对象为<unittest.suite.TestSuite tests=[<unittest.suite.TestSuite tests=[<testmath.TestMath testMethod=test_jiafa_1>, <testmath.TestMath testMethod=test_jiafa_2>, <testmath.TestMath testMethod=test_jiafa_3>]>]>

参数sortTestMethodsUsing

修改对用例的排序，默认为按照字母正序排序

比如说我希望按照字母倒序排序

loader = unittest.TestLoader()
loader.sortTestMethodsUsing = lambda x, y:(x < y)-(x > y)
name = loader.loadTestsFromTestCase(testmath.TestMath)
print(name)

这样就是从test_jiafa在test_chengfa之前运行