all Python 3unittestfunction

unittest.TestCase.setUp()

fixtures

Run before EVERY test method of the class to prepare state (files, DB, mocks); an exception in setUp is an error, a failed assert* a failure; the test is skipped.

Syntax

def setUp(self): ...    # до каждого теста

setUp deliberately runs again before every single test to keep them isolated; if the preparation is expensive (starting a server, opening a DB connection), move it to setUpClass, which runs once per class. For releasing resources, calling self.addCleanup(...) right after you acquire something is safer than tearDown — cleanups still fire when setUp blows up halfway through, while tearDown is skipped entirely.

Examples

import unittest
class DBTest(unittest.TestCase):
    def setUp(self):
        self.data = {'key': 'val'}   # инициализация
    def test_key(self):
        self.assertIn('key', self.data)

See also

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