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A module to simplify using pytest for AiiDA plugins.

Project description

aiida-pytest

This is a helper to enable testing AiiDA plugins with pytest. The main purpose is to create a fixture which sets up a temporary AiiDA database and user, and simplify setting up the computers and calculations.

To get started, create a tests folder where your pytest tests will be located. In conftests.py, you need to write

from aiida_pytest import *

This defines the configure and configure_with_daemon fixtures. To set up computers and codes for the test run, you need a config.yml file in the tests folder (and run pytest from there). The following example config file sets up localhost and the bands-inspect code:

computers:
  localhost:
    hostname: localhost
    description: localhost
    transport: local
    scheduler: direct
    work_directory: /tmp/test_aiida
    prepend_text: 'unset PYTHONPATH'

codes:
  bands_inspect:
    description: bands_inspect code
    default_plugin: bands_inspect.difference
    remote_computer: localhost
    remote_abspath: /home/a-dogres/.virtualenvs/bands-inspect/bin/bands-inspect

Note: aiida-pytest is not compatible with the aiida-xdist plugin, since the fixtures with scope=session are then called for each running worker.

Defining and running tests

Tests with aiida-pytest are defined and run exactly like "regular" pytest tests. If a test needs the AiiDA database, it should use the configure fixture. If the test also requires the Daemon to run, it should use the configure_with_daemon fixture. Note that, since certain AiiDA import statements require the database backend to be set, these imports should be done inside the test function.

After the tests have run, the code will wait for you to press Enter before deleting the testing database and repository. This gives you the opportunity to manually inspect the final state. If you want to avoid this step (for example in a CI system), pass the --quiet-wipe flag to py.test.

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