---
id: TST-ACC-TRX-148
title: Refund check number suite
kind: unit
product_area: accounting
module: transactions
revision: 1
status: draft
source_sha:
  services-accounting: f47cb263875bbc0c5640fba7dae6785ec32695f8
repository: services-accounting
files:
  - modules/transactions/tests/unit/rules/refund-check-number.spec.js
implements: []
implements_parts: []
environment: local
implementation_state: implemented
latest_result: not-run
latest_run_at: null
latest_run_ref: null
conformance: not-verified
estimated_minutes: 1
isolation: In-memory fixtures and test-controlled collaborators.
provenance: test
source: >-
  services-accounting:modules/transactions/tests/unit/rules/refund-check-number.spec.js
evidence:
  - provenance: test
    source: >-
      services-accounting:modules/transactions/tests/unit/rules/refund-check-number.spec.js
    assertion_titles:
      - the refund’s check number rules
      - accepts a check number on a refund by check
      - 'refuses a check number on a refund by cash, in plain words'
      - does not refuse a refund of any method that gives no check number
      - trims the number in the request
      - reads an empty number as null
      - refuses a number of 51 characters
      - accepts a number of 50 characters
      - refuses a number beside a method that is not a check
    imports:
      - 'const { expect } = require(''chai'');'
      - >-
        const { requestRefundRequestSchema } =
        require('../../../aws/api/refunds.schemas');
      - >-
        const { requireCheckMethodForCheckNumber } =
        require('../../../services/refunds/refund-rules');
    test_double_declarations: []
---

# Refund check number suite

## Verification Boundary

The suite exercises financial calculations and input contracts in an isolated test process. Registration records the existing executable file; it does not report a run or establish product approval.

## What This Suite Proves

The executable assertions exercise this module, but no capability or feature scenario binding is established for this file. Its individual assertion titles remain in the evidence register for subsequent mapping.

## What It Does Not Prove

Pure calculations and doubled collaborators do not establish database persistence, route authorization or deployed behavior. An unbound feature chain remains proposed, and this registration carries no execution result.

## Real Dependencies and Test Doubles

The imported calculation or contract runs with the fixtures and collaborators declared by the test. The evidence register retains those declarations so the boundaries can be inspected.

## Must Not Be Doubled

The calculation or contract being asserted must remain real; replacing it with a predetermined result removes this suite’s evidence.