Test Generation & Coverage Assistants

Produces tests for existing or new code, including property-based tests asserting invariants rather than examples. Among the strongest applications, because a wrong test usually fails loudly rather than silently.

Raising coverage on untested code, generating edge cases humans overlook, and articulating invariants as properties.

Generating tests from the code alone, which encodes current behaviour as correct — including its bugs.

Tests for control-bearing logic must be derived from the specification or policy, not from the implementation, or they verify only that the code does what it does.

Tests that mirror the implementation, passing forever and detecting nothing, while coverage figures improve.

Generating property-based tests asserting that reconciling items sum exactly to the balance difference — an invariant, not an example, and derived from the domain rule rather than the code.