Is it possible for a unit test to assert that a method calls sys.exit()?

by

Yes. sys.exit raises SystemExit, so you can check it with assertRaises:

with self.assertRaises(SystemExit):
    your_method()

Instances of SystemExit have an attribute code which is set to the proposed exit status, and the context manager returned by assertRaises has the caught exception instance as exception, so checking the exit status is easy:

with self.assertRaises(SystemExit) as cm:
    your_method()

self.assertEqual(cm.exception.code, 1)

 

sys.exit Documentation:

Exit from Python. This is implemented by raising the SystemExit exception … it is possible to intercept the exit attempt at an outer level.

More Related Contents:

  1. How do you generate dynamic (parameterized) unit tests in Python?
  2. How do you test that a Python function throws an exception?
  3. How to properly assert that an exception gets raised in pytest?
  4. How do I run all Python unit tests in a directory?
  5. How unique is Python’s id()?
  6. How do you write tests for the argparse portion of a python module?
  7. Python unittest.TestCase execution order
  8. Where do the Python unit tests go? [closed]
  9. TransactionManagementError “You can’t execute queries until the end of the ‘atomic’ block” while using signals, but only during Unit Testing
  10. How to test a function with input call?
  11. Unittest setUp/tearDown for several tests
  12. Python Mocking a function from an imported module
  13. How to supply stdin, files and environment variable inputs to Python unit tests?
  14. Python mock multiple return values
  15. Mocking a class: Mock() or patch()?
  16. Python: Write unittest for console print
  17. Assert that a method was called in a Python unit test
  18. Mock attributes in Python mock?
  19. Access self from decorator
  20. Python unittest – opposite of assertRaises?
  21. Mock Python’s built in print function
  22. Unittest tests order
  23. Mocking Functions Using Python Mock
  24. how to share a variable across modules for all tests in py.test
  25. Running a specific test case in Django when your app has a tests directory
  26. Outputting data from unit test in Python
  27. Unit testing a python app that uses the requests library
  28. Python Unit Testing: Automatically Running the Debugger when a test fails
  29. ValueError: no such test method in : runTest
  30. How can I specify a database for Django Tests to use instead of having it build it every time?

Leave a Comment