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Sarj Standards

Python · testing

trivially-true-assertion

python:trivially-true-assertion

Assertions should depend on behavior rather than echoing values supplied by the test.

Code
SARJ064
Default
error
Fix
none
Languages
python

Why

Constructor keyword echoes and equivalent tautologies cannot reveal an application defect.

Fix

Assert a transformation, validation result, or other value produced independently of the fixture literal.

Before / after

Executed by this rule’s unit tests.

Before

Assertion repeats a constructor keyword

tests/test_user.py · focus
def test_user():
    user = User(name="Ada")
    assert user.name == "Ada"

After

Assertion checks a derived value

tests/test_user.py · focus
def test_user():
    user = User(name="Ada Lovelace")
    assert user.initials == "AL"

Limits

  • Literal-only assertions owned by Ruff or SARJ057 are excluded.
  • Constructor echoes with evidence of field coercion are excluded.