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Modern Test Automation for Python

at·test /əˈtɛst/
To affirm to be correct, true, or genuine.

Attest is a test automation framework for Python emphasising modern idioms and conventions.

from attest import Tests
math = Tests()

def arithmetics():
    """Ensure that the laws of physics are in check."""
    assert 1 + 1 == 2

if __name__ == '__main__':


  • Collect tests using decorators instead of matching names against a regexp
  • Set up fixtures as context managers that can be combined and reused
  • Use the assert statement with arbitrary expressions that are inspected on failure
  • Scan for collections by type rather than by name
  • Treat tests as Python packages rather than script files