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# Testing

Phatch uses two strategies for testing:

- acceptance testing for all possible image processing pipelines
- unit tests by doctests

## Acceptance testing

The acceptance testing uses the images inside the `tests/input` folder. To get all options for image acceptance testing, run this command from the `tests` folder:

    python acceptance_test.py --help

Here are some examples, choose one of the two listed commands ...

- To run all tests use:

      python acceptance_test.py --all
      python acceptance_test.py -a

- To run only the library tests use:

      python acceptance_test.py --tag=library
      python acceptance_test.py -t library

- To run only tests with a certain tag use:

      python acceptance_test.py --tag=tag_name
      python acceptance_test.py -t tag_name

- To test only one action:

      python acceptance_test.py --select=action_name
      python acceptance_test.py -s action_name

## Doctests

We chose for doctests as it saves time by being both unit tests and documentation. Please add doctests to the code you contribute.

Run the doctests inside the `tests` folder:

    python doc_test.py

This will automatically also be run by the bzr precommit hook.

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