Outcome: done
Changed: tests/test_calculator.py:5, tests/test_calculator.py:213-260
Verified by: `make verify` — passed, 104 tests, 0 failures
Findings:
- tests/test_calculator.py:5 — added `percentage` to the import from `typosaurus_sandbox.domain.calculator`
- tests/test_calculator.py:212-260 — added `TestPercentageFunction` class with 11 unit tests covering: success cases (half, quarter, zero, exceeds total), negative inputs (negative value, negative total, both negative), float inputs, total-zero error paths (integer and float zero), and return type verification (integer inputs yield float result)
- All 104 tests pass under `make verify` with zero failures (93 existing + 11 new percentage unit tests)
Open: none
Confidence: high — all acceptance criteria met; API tests were already completed by sibling node (expose-missing-operations); percentage unit tests now complete unit test coverage; verification passed
Typosaurus-Run: 34b5946ec981488091bee588eb919ff2
Typosaurus-Node: f085f049a7424a628ea68af395e24072
Typosaurus-Agent: @sveta
Refs: #28
typosaurus
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