Python单元测试，测试用例之前的声明

Question

Imagine I have tests like that:

import unittest

class MyTests(unittest.TestCase):

  print("Starting")

  def test_first(self):
    .....

Is the print statement guaranteed to be executed before test_first() and the rest? From what I've seen it does get executed first, but are there any edge cases?

Answer 1

You can use setUp() ( docs ) and setUpClass() ( docs ) methods for this. The setUp() method is executed before each individual test while the setUpClass() method is executed before all the tests in this class run.

import unittest

class MyTests(unittest.TestCase):

    @classmethod
    def setUpClass(cls):
        print("Starting all the tests.")

    def setUp():
        print("Starting another test.")

    def test_first(self):
        .....