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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchUse tearDown() to run code after each test method that fails or raises an error, provided setUp() completed. To run code once after the entire test suite, run the suite from Python and inspect the TestResult returned by the runner. For a shell or CI follow-up, run a separate command after unit2 and preserve the test process’s exit status.
Choose when the follow-up should run
| Need | Use | Important behavior |
|---|---|---|
| After every test method | tearDown() |
Runs after the test outcome is recorded if setup completed, including after a failure or unexpected exception. |
| Cleanup even if setup fails | Register a cleanup callback with addCleanup() as soon as the resource is created |
Availability depends on the installed unittest2 version. Current Python documentation says cleanups run after teardown, in last-in-first-out order, and still run if setup fails. |
| Once after all tests | Run the suite with a runner and inspect its returned result | Lets the driver decide whether to produce a report or take another suite-level action. |
| After the test process exits | Sequence commands in a shell or CI job | Preserve the test command’s exit status so a follow-up command does not hide a failed test run. |
Run code after each failed test
Define tearDown(self) on the relevant TestCase. It is called after the test method’s outcome has been recorded, whether that method passed, failed an assertion, or raised an unexpected exception, as long as setUp() completed successfully. It runs once per test instance; it is not a hook for the end of the whole suite.
import unittest2
class ExampleTest(unittest2.TestCase):
def setUp(self):
self.resource = open_resource()
def test_something(self):
self.assertTrue(check_resource(self.resource))
def tearDown(self):
# Runs after the test outcome is recorded, if setUp succeeded.
save_per_test_diagnostics()
close_resource(self.resource)Teardown is not conditional on failure in this example: it runs after successful tests too. If the follow-up should happen only after failure, check the appropriate result state supported by the installed runtime; do not assume a modern API exists in every legacy unittest2 installation. A teardown exception may be recorded as an additional error, making the original test failure harder to diagnose. Keep diagnostics and cleanup defensive, and avoid allowing a secondary exception to mask useful information.
Ensure cleanup runs when setup fails
tearDown() is not called when setUp() fails. For a resource that must be released even in that case, register a cleanup callback immediately after acquiring it. Verify that the installed unittest2 release supports the API you use.
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import unittest2
class ResourceTest(unittest2.TestCase):
def setUp(self):
self.resource = open_resource()
self.addCleanup(self.resource.close)
def test_resource(self):
self.assertTrue(check_resource(self.resource))Current Python documentation describes cleanup callbacks as running after teardown in last-in-first-out order and running even when setup fails. That behavior should not be assumed for an old unittest2 package without checking its supported API.
Run code once after the full suite
Use a driver script when your follow-up needs the outcome of the complete suite. The runner’s run() method returns a result object; inspect failures for assertion or explicit test failures and errors for unexpected exceptions.
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import unittest2
suite = unittest2.TestLoader().discover("tests")
result = unittest2.TextTestRunner(verbosity=2).run(suite)
if result.failures or result.errors:
run_failure_report(result)
if not result.wasSuccessful():
raise SystemExit(1)Discovery and runner methods should be checked against the installed unittest2 release. The final exit code in this example keeps the driver’s process status unsuccessful when the suite has failures or errors; adjust the report routine to your application without swallowing that status.
Run a shell or CI follow-up
The unittest2 project documents the unit2 command-line script, including unit2 discover and unit2 -v test_module. A shell or CI sequence is appropriate when the follow-up does not need to inspect individual result objects. Use shell failure handling deliberately: a later successful command can otherwise become the job’s final status even when tests failed.
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unit2 discover
status=$?
if [ "$status" -ne 0 ]; then
python report_failure.py
fi
exit "$status"This example records the test command’s status, runs reporting only on failure, and exits with the original status. Adapt the command and shell syntax to the CI environment in use.
Check unittest2 and Python compatibility
unittest2 is a backport of unittest features, and its available APIs depend on the package and Python version installed. Its project page documents unit2 and notes that Python 2.7 can use python -m unittest; it also warns about compatibility limits when mixing unittest2 infrastructure with standard-library loaders, runners, or result objects. Prefer a consistent set of test, loader, runner, and result classes.
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Current Python documentation is useful for understanding behavior, but its newer APIs are not automatically available in a legacy unittest2 environment. For example, Python 3.14 documentation includes APIs with later version introductions, such as enterContext() and addClassCleanup(). Check the installed versions and the API’s version annotation before copying examples from current documentation.
Troubleshoot common problems
- My teardown did not run. Check whether
setUp()completed. If setup failed, teardown is not called; register cleanup immediately after creating each resource, if supported by your unittest2 version. - The follow-up ran after passing tests too. That is expected:
tearDown()runs after every test whose setup succeeded. Put suite-level or failure-only behavior in a driver that inspects the returned result. - The original failure is now hard to find. A teardown exception can add an error to the result. Make teardown steps resilient and ensure reporting preserves the original test outcome.
- A modern example raises an attribute error. The API may not exist in the installed Python or unittest2 version. Check package/runtime versions and use the package’s compatible API rather than assuming current standard-library documentation applies.
- The CI job reports success despite failed tests. Ensure the final job status reflects the test command’s exit status, even if a reporting command runs afterward.
- Mixing loaders or runners causes confusing result behavior. Use unittest2’s own compatible test infrastructure rather than combining it casually with standard-library components; the package documents compatibility limitations.
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Sources
- Python 3.14.8 unittest documentation for teardown behavior and test results.
- unittest2 on PyPI for package and command-line details.
- Python 3.14.8 addCleanup documentation for cleanup callback behavior.
- Python 2.6.6 unittest documentation for historical loader and runner patterns.
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