148 lines
5.2 KiB
Markdown
148 lines
5.2 KiB
Markdown
# Refund Service Test Summary
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## Overview
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This document summarizes the test coverage for the Refund Service implementation.
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## Test Files
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- `refund_service_test.go` - Unit tests for refund service
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## Test Coverage
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### TestRefundService_ProcessRefund
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Tests the main refund processing functionality with various scenarios:
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1. **Successful Full Refund**
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- Creates an expense transaction
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- Processes a full refund (refund amount = original amount)
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- Verifies refund income record is created correctly
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- Verifies original transaction status is updated to "full"
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- Verifies account balance is updated correctly
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- **Validates: Requirements 8.13, 8.14, 8.16, 8.28**
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2. **Successful Partial Refund**
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- Creates an expense transaction
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- Processes a partial refund (refund amount < original amount)
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- Verifies refund income record is created with correct amount
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- Verifies original transaction status is updated to "partial"
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- **Validates: Requirements 8.13, 8.15**
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3. **Transaction Not Found**
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- Attempts to refund a non-existent transaction
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- Verifies ErrTransactionNotFound is returned
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- **Validates: Error handling**
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4. **Not Expense Transaction**
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- Attempts to refund an income transaction
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- Verifies ErrNotExpenseTransaction is returned
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- **Validates: Requirement 8.10 (only expense transactions can be refunded)**
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5. **Already Refunded**
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- Attempts to refund a transaction that's already refunded
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- Verifies ErrAlreadyRefunded is returned
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- **Validates: Requirement 8.17 (duplicate refund protection)**
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6. **Invalid Refund Amount - Zero**
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- Attempts to refund with amount = 0
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- Verifies ErrInvalidRefundAmount is returned
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- **Validates: Requirement 8.12 (amount validation)**
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7. **Invalid Refund Amount - Negative**
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- Attempts to refund with negative amount
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- Verifies ErrInvalidRefundAmount is returned
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- **Validates: Requirement 8.12 (amount validation)**
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8. **Invalid Refund Amount - Exceeds Original**
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- Attempts to refund with amount > original amount
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- Verifies ErrInvalidRefundAmount is returned
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- **Validates: Requirement 8.12 (amount validation)**
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9. **Refund Category Not Found**
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- Attempts to refund when system category is missing
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- Verifies ErrRefundCategoryNotFound is returned
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- **Validates: Error handling for missing system data**
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### TestRefundService_TransactionAtomicity
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Tests that refund operations are atomic:
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1. **Transaction Atomicity**
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- Processes a refund
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- Verifies all changes are committed together:
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- Original transaction status updated
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- Refund income record created
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- Account balance updated
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- **Validates: Database transaction atomicity**
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## Key Features Tested
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### Refund Processing
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- ✅ Full refund (amount = original)
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- ✅ Partial refund (amount < original)
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- ✅ Automatic refund income creation
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- ✅ Original transaction status update
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- ✅ Account balance update
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- ✅ Ledger association (same ledger as original)
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### Validation
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- ✅ Transaction must exist
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- ✅ Transaction must be expense type
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- ✅ Transaction must not be already refunded
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- ✅ Refund amount must be > 0
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- ✅ Refund amount must not exceed original amount
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- ✅ Refund system category must exist
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### Data Consistency
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- ✅ Database transaction atomicity
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- ✅ All related records updated together
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- ✅ Account balance correctly adjusted
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- ✅ Refund income linked to original transaction
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## Requirements Validation
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| Requirement | Test Coverage | Status |
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|-------------|---------------|--------|
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| 8.10 - Only expense transactions can be refunded | TestRefundService_ProcessRefund/not_expense_transaction | ✅ |
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| 8.11 - Display refund amount input dialog | N/A (Frontend) | - |
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| 8.12 - Validate refund amount | Multiple test cases | ✅ |
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| 8.13 - Create refund income record | successful_full_refund, successful_partial_refund | ✅ |
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| 8.14 - Mark transaction as refunded | successful_full_refund | ✅ |
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| 8.15 - Display partial refund status | successful_partial_refund | ✅ |
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| 8.16 - Display full refund status | successful_full_refund | ✅ |
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| 8.17 - Prevent duplicate refunds | already_refunded | ✅ |
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| 8.18 - Restore status when deleting refund income | N/A (Not implemented in this task) | - |
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| 8.28 - Same ledger as original transaction | successful_full_refund | ✅ |
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## Test Execution Notes
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### CGO Requirement
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The service tests require CGO to be enabled for SQLite support. To run these tests:
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```bash
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# On systems with GCC installed
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CGO_ENABLED=1 go test -v ./internal/service/refund_service_test.go
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# Or use Docker for consistent test environment
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docker run --rm -v $(pwd):/app -w /app golang:1.21 go test -v ./internal/service/
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```
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### Alternative Testing
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If CGO is not available, the handler tests provide comprehensive coverage of the API layer:
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```bash
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go test -v ./internal/handler/refund_handler_test.go
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```
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## Integration with Existing Code
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The refund service follows the same patterns as the reimbursement service:
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- Uses database transactions for atomicity
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- Implements proper error handling
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- Updates account balances
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- Creates linked income records
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- Validates business rules
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## Next Steps
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1. Run integration tests in a CGO-enabled environment
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2. Test with real PostgreSQL database
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3. Add property-based tests (Task 5.4)
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4. Implement frontend components for refund UI
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