assertive 1.3.0

A small assertion library for testing

Assertive

Assertive is a lightweight Python assertion library for writing declarative, composable test expectations.

Install

pip install assertive

Quickstart

from assertive import (
    contains,
    is_even,
    is_gt,
    is_lt,
    regex,
)

assert 5 == is_gt(4)
assert 5 == is_gt(4) & is_lt(6)
assert 4 == is_even()
assert "hello" == regex(r"^h.*o$")
assert [1, 2, 3] == contains(2)

You can compose criteria with boolean operators:

assert 5 == is_gt(4) & is_lt(6)  # AND
assert 5 == is_even() | is_lt(6)  # OR
assert 5 == is_even() ^ is_lt(6)  # XOR
assert 5 == ~is_even()  # NOT

Documentation

• User guide: https://peter-daly.github.io/assertive/
• Criteria reference: https://peter-daly.github.io/assertive/criteria/
• Writing custom criteria: https://peter-daly.github.io/assertive/criteria/writing-custom-criteria/