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CONTRIBUTING: Enhance the "testing" section

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Link to littlecheck, explain where pexpect is being setup,

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Fabian Homborg 2020-11-30 18:28:24 +01:00
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CONTRIBUTING.rst
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@ -263,17 +263,14 @@ regressions in the future (i.e., we don’t reintroduce the bug).
The tests can be found in three places:
- src/fish_tests.cpp for tests to the core C++ code
- tests/checks for script tests
- tests/pexpects for interactive tests using pexpect
- tests/checks for script tests, run by [littlecheck](https://github.com/ridiculousfish/littlecheck)
- tests/pexpects for interactive tests using [pexpect](https://pexpect.readthedocs.io/en/stable/)
When in doubt, the bulk of the tests should be added as a littlecheck test in tests/checks, as they are the easiest to modify and run, and much faster and more dependable than pexpect tests. The syntax is fairly self-explanatory. It's a fish script with the expected output in ``# CHECK:`` or ``# CHECKERR:`` (for stderr) comments.
fish_tests.cpp is mostly useful for unit tests - if you wish to test that a function does the correct thing for given input, use it.
The pexpects are written in python and can simulate input and output to/from a terminal, so they are needed for anything that needs actual interactivity.
Fish also depends on ``diff`` and `pexpect
<https://pexpect.readthedocs.io/en/stable/>`__ for its tests.
The pexpects are written in python and can simulate input and output to/from a terminal, so they are needed for anything that needs actual interactivity. The runner is in build_tools/pexpect_helper.py, in case you need to modify something there.
Local testing
~~~~~~~~~~~~~