# 23.4 `test` -- Regression tests package for Python

The `test` package contains all regression tests for Python as well as the modules `test.test_support` and `test.regrtest`. `test.test_support` is used to enhance your tests while `test.regrtest` drives the testing suite.

Each module in the `test` package whose name starts with "`test_`" is a testing suite for a specific module or feature. All new tests should be written using the `unittest` module; using `unittest` is not required but makes the tests more flexible and maintenance of the tests easier. Some older tests are written to use `doctest` and a ``traditional'' testing style; these styles of tests will not be covered.

See Also:

Module `unittest`:
  Writing PyUnit regression tests.

Module `doctest`:
  Tests embedded in documentation strings.