Python unit test module unittest

Some Basic Concepts

Test Fixture
A test fixture represents the preparation needed to perform one or moretests, and any associate cleanup actions. This may involve, for example, creating temporary or proxy databases, directories, or starting a serverprocess.
Test Case
A test case is the smallest unit of testing. It checks for a specificresponse to a particle set of inputs. unittest provides a base class, testcase, which may be used to create new test cases.
Test Suite
A test suite is a collection of test cases, Test suites, or both. It isused to aggregate tests that shocould be executed together.
Test runner

A test runner is a component which orchestrates the execution of testsand provides the outcome to the user. the runner may use a graphical interface, a textual interface, or return a special value to indicate the results ofexecuting the tests.

The following is a simple example.

#Rectangle.pyclass Rectangle:    def __init__(self,length,width):        self.length = length        self.width = width            def girth(self):        return 2*(self.length+self.width)        def area(self):        return self.length*self.width#pytest.pyfrom Rectangle import Rectangleimport unittestclass RectangleTestCase(unittest.TestCase):    def setUp(self):        self.rectangle = Rectangle(10,5)         def tearDown(self):        self.rectangle = None       def testGirth(self):        self.assertEqual(self.rectangle.girth(), 30)       def testArea(self):        self.assertEqual(self.rectangle.area(), 100)def suite():    suite = unittest.TestSuite()    suite.addTest(RectangleTestCase("testGirth"))    suite.addTest(RectangleTestCase("testArea"))    return suiteif __name__ == "__main__":       unittest.TextTestRunner().run(suite())   

The running result is as follows:

Joe @ Joe:/mnt/share $ Python pytest. py
. F
========================================================== ====================================
Fail: testarea (_ main _. rectangletestcase)
----------------------------------------------------------------------
Traceback (most recent call last ):
File "pytest. py", line 15, in testarea
Self. assertequal (self. Rectangle. Area (), 100)
Assertionerror: 50! = 100

----------------------------------------------------------------------
Ran 2 tests in 0.007 s

Failed (failures = 1)

We can see that there is a failure prompt, because it is incorrect when calculating the area, it should be 50, change the content of pytest. py

def testArea(self):        self.assertEqual(self.rectangle.area(), 50)

Try again

Joe @ Joe:/mnt/share $ Python pytest. py
..
----------------------------------------------------------------------
Ran 2 tests in 0.000 s

This is OK, no error.

The following are some related materials:

Python official documentation

Python unit testing framework