Mitgliederverwaltung/.plans/done/issue-45-fee-calculation-tests.md

Plan: Issue #45 — Unit tests for FeeCalculationService

Summary

Create comprehensive PHPUnit tests for FeeCalculationService covering all 13 test cases specified in the issue: single member fees, family discount tiers, frozen rates, Erziehungsberechtigter exclusion, manual overrides during batch, mixed family states, error handling for missing rules, and cross-year rule changes.

Implementation Steps

Step 1: Create phpunit.xml configuration

• Add phpunit.xml at project root with standard Nextcloud app test configuration
• Configure autoloading to use composer PSR-4 paths
• Set test suite directory to tests/Unit/

Step 2: Create test helper for building mock Members/Rules

• Create a helper trait or base class that provides factory methods:
  • createMember(id, rolle, status, familyId, geburtsdatum, frozenFeeRate)
  • createFeeRule(yearFrom, baseRate, familyRulesJson, inactiveRule)
  • createFeeRecord(memberId, year, amount, manuellAngepasst)

Step 3: Create FeeCalculationServiceTest.php

Write isolated test methods for each case in the issue:

1. testSingleMemberNoFamily — member without family_id → base_rate
2. testSingleChildInFamily — 1 active child → family rule "1" rate
3. testTwoChildrenInFamily — 2 active children → correct per-child amounts per position
4. testThreeOrMoreChildrenInFamily — 3+ children → "3+" catch-all rule applied, additional children at that rate
5. testInactiveMemberWithFrozenRate — inactive member with frozen_fee_rate → frozen rate returned
6. testErziehungsberechtigterExcluded — rolle=erziehungsberechtigter → fee = 0.00
7. testManualOverrideSkippedDuringBatch — manuell_angepasst records not overwritten in batchCalculate
8. testMixedFamilyActiveInactiveChildren — only active children counted for position-based discount
9. testMemberBecomesInactiveMidYear — rate frozen at current value
10. testNoFeeRuleForYear — DoesNotExistException thrown
11. testRuleChangeBetweenYears — correct rule applied per year
12. testEmptyFamilyNoChildren — no fees generated (base rate for adults in empty family)
13. testMemberWithoutFamilyWithOverrideBanking — base rate

Step 4: Ensure all tests use mocked mappers

• Mock FeeRuleMapper, FeeRecordMapper, MemberMapper
• Mock IUserSession and LoggerInterface
• Each test creates its own data set, no shared state

Acceptance Criteria Checklist

• AC1: FeeCalculationServiceTest.php exists in tests/Unit/
• AC2: All 13 test cases from the issue are implemented
• AC3: Tests use mock data (mocked mappers), isolated per test
• AC4: Tests assert exact amounts and rule snapshots
• AC5: Tests cover both calculateFee() and batchCalculate() methods
• AC6: phpunit.xml configuration is present