testing

import testing

The testing module is a small, pure-py4 test helper that layers over the runtime assertion mechanism.

Functions

Signature	Description
testing.fail(msg: str) -> None	Unconditionally fail with message
testing.assert_true(value: bool) -> None	Fail if value is False
testing.assert_false(value: bool) -> None	Fail if value is True
testing.assert_eq(a, b) -> None	Fail if a != b (int, float, bool, char, str)
testing.assert_ne(a, b) -> None	Fail if a == b (int, float, bool, char, str)

Example

import testing

def main() -> None:
    testing.assert_true(True)
    testing.assert_false(False)
    testing.assert_eq(3, 3)
    testing.assert_eq(1.5, 1.5)
    testing.assert_eq('x', 'x')
    testing.assert_eq("py4", "py4")
    testing.assert_ne(3, 4)
    testing.assert_ne("aa", "ab")
    print("ok")

Notes

• Failures write to stderr and exit the process — same as assert.
• Deep structural equality for lists, dicts, tuples, and classes is not yet supported; compare scalar fields manually.
• The module is intentionally minimal. There is no test runner, test registration, or reporting framework.