Introducing testfixture into unittest framework

TestFixture yes Unittest Firmware in the frame , Write it in the class of the test case to be run , Used as the class method of this class .

1、4 There are four common methods ：setUp(),tearDown(),setUpClass(),tearDownClass()

2、4 Operation rules of common methods ：

setUp()： Functions that will run before running test cases , Used to set configuration information 、 Static attribute

setUpClass()： Need and @classmethod The decorator is used together , After instantiating the class , Methods that will run automatically , Mainly used for instantiating classes 、 Set some environment variables, such as database connection configuration

Use unittest.main() Method will run first setUpClass() Procedure in method

tearDown()： After running a test case , Will run , The function is to destroy the data between each test case 、 Release resources 、 Restore data

tearDownClass()： After all the test cases in the class are run , Methods that will run automatically , The function is to destroy class level resources 、 Restore data

3、 The following figure shows the sequence of running one test case at a time , cycle

 4、 Example

test_Fixture_demo.py

#  Examples demonstrate fixture  Case study 

import unittest

#  Test class 
class SumDemo:

    def plus(self, x, y):
        return x + y

#  establish unittest Test class 
class TestSum(unittest.TestCase):

    add = None

    #  Write test build 
    def setUp(self):
        self.x = 1
        self.y = 1
        print(" It's running setUp")

    @classmethod
    def setUpClass(cls):
        # Instantiation SumDemo
        cls.add = SumDemo()
        print(" It's running setUpClass")

    def tearDown(self):
        del self.x
        del self.y
        print(" It's running tearDown")

    @classmethod
    def tearDownClass(cls):
        del cls.add
        print(" It's running teardownClass")

    def test_01(self):
        result = self.add.plus(2, 3)
        print(result)

    def test_02(self):
        result = self.add.plus(3, 3)
        print(result)

Running results ：