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internal/handler/REFUND_HANDLER_TEST_SUMMARY.md
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internal/handler/REFUND_HANDLER_TEST_SUMMARY.md
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# Refund Handler Test Summary
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## Overview
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This document summarizes the test coverage for the Refund Handler implementation.
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## Test Files
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- `refund_handler_test.go` - Unit tests for refund HTTP handler
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## Test Execution Results
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✅ **All tests passing** (14/14 test cases)
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```
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=== RUN TestRefundHandler_ProcessRefund
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=== RUN TestRefundHandler_ProcessRefund/successful_full_refund
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=== RUN TestRefundHandler_ProcessRefund/successful_partial_refund
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=== RUN TestRefundHandler_ProcessRefund/invalid_transaction_ID
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=== RUN TestRefundHandler_ProcessRefund/missing_amount
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=== RUN TestRefundHandler_ProcessRefund/zero_amount
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=== RUN TestRefundHandler_ProcessRefund/negative_amount
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=== RUN TestRefundHandler_ProcessRefund/transaction_not_found
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=== RUN TestRefundHandler_ProcessRefund/not_expense_transaction
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=== RUN TestRefundHandler_ProcessRefund/already_refunded
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=== RUN TestRefundHandler_ProcessRefund/invalid_refund_amount
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=== RUN TestRefundHandler_ProcessRefund/refund_category_not_found
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=== RUN TestRefundHandler_ProcessRefund/internal_server_error
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--- PASS: TestRefundHandler_ProcessRefund (0.00s)
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=== RUN TestRefundHandler_RegisterRoutes
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--- PASS: TestRefundHandler_RegisterRoutes (0.00s)
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PASS
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```
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## Test Coverage
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### TestRefundHandler_ProcessRefund
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Tests the HTTP handler for processing refunds with various scenarios:
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#### Success Cases
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1. **Successful Full Refund**
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- HTTP Method: PUT
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- Endpoint: `/api/v1/transactions/:id/refund`
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- Request Body: `{"amount": 100.0}`
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- Expected Status: 200 OK
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- Expected Response: Refund income transaction data
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- **Validates: Requirements 8.10-8.14**
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2. **Successful Partial Refund**
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- HTTP Method: PUT
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- Endpoint: `/api/v1/transactions/:id/refund`
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- Request Body: `{"amount": 50.0}`
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- Expected Status: 200 OK
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- Expected Response: Refund income transaction data
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- **Validates: Requirements 8.10-8.13, 8.15**
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#### Validation Error Cases
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3. **Invalid Transaction ID**
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- Transaction ID: "invalid" (non-numeric)
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- Expected Status: 400 Bad Request
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- Expected Error: "Invalid transaction ID"
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- **Validates: Input validation**
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4. **Missing Amount**
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- Request Body: `{}`
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- Expected Status: 400 Bad Request
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- **Validates: Required field validation**
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5. **Zero Amount**
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- Request Body: `{"amount": 0}`
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- Expected Status: 400 Bad Request
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- **Validates: Requirement 8.12 (amount must be > 0)**
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6. **Negative Amount**
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- Request Body: `{"amount": -50.0}`
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- Expected Status: 400 Bad Request
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- **Validates: Requirement 8.12 (amount must be positive)**
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#### Business Logic Error Cases
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7. **Transaction Not Found**
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- Transaction ID: 999 (non-existent)
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- Expected Status: 404 Not Found
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- Expected Error: "Transaction not found"
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- **Validates: Error handling**
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8. **Not Expense Transaction**
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- Attempting to refund an income transaction
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- Expected Status: 400 Bad Request
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- Expected Error: "Only expense transactions can be refunded"
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- **Validates: Requirement 8.10**
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9. **Already Refunded**
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- Attempting to refund a transaction that's already refunded
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- Expected Status: 400 Bad Request
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- Expected Error: "Transaction already refunded"
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- **Validates: Requirement 8.17 (duplicate refund protection)**
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10. **Invalid Refund Amount**
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- Refund amount exceeds original amount
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- Expected Status: 400 Bad Request
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- Expected Error: "Refund amount must be greater than 0 and not exceed original amount"
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- **Validates: Requirement 8.12**
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#### System Error Cases
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11. **Refund Category Not Found**
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- System category missing from database
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- Expected Status: 500 Internal Server Error
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- Expected Error: "Refund system category not found. Please run database migrations."
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- **Validates: System integrity checks**
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12. **Internal Server Error**
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- Generic database or system error
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- Expected Status: 500 Internal Server Error
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- Expected Error: "Failed to process refund"
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- **Validates: Error handling**
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### TestRefundHandler_RegisterRoutes
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Tests that routes are properly registered:
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1. **Route Registration**
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- Verifies PUT `/api/v1/transactions/:id/refund` route is registered
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- **Validates: API endpoint availability**
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## API Specification
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### Endpoint: PUT /api/v1/transactions/:id/refund
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**Description:** Processes a refund on an expense transaction, automatically creating a refund income record.
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**Path Parameters:**
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- `id` (uint, required): Transaction ID
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**Request Body:**
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```json
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{
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"amount": 100.0 // float64, required, must be > 0 and <= original amount
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}
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```
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**Success Response (200 OK):**
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```json
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{
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"success": true,
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"data": {
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"id": 2,
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"type": "income",
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"amount": 100.0,
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"note": "退款 - Original transaction note",
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"income_type": "refund",
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"original_transaction_id": 1,
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"ledger_id": 1,
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...
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}
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}
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```
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**Error Responses:**
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| Status Code | Error Code | Message | Scenario |
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|-------------|-----------|---------|----------|
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| 400 | BAD_REQUEST | Invalid transaction ID | Non-numeric ID |
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| 400 | VALIDATION_ERROR | Invalid request body | Missing/invalid amount |
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| 400 | BAD_REQUEST | Only expense transactions can be refunded | Income transaction |
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| 400 | BAD_REQUEST | Transaction already refunded | Duplicate refund |
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| 400 | BAD_REQUEST | Refund amount must be greater than 0 and not exceed original amount | Invalid amount |
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| 404 | NOT_FOUND | Transaction not found | Non-existent transaction |
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| 500 | INTERNAL_ERROR | Refund system category not found | Missing system data |
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| 500 | INTERNAL_ERROR | Failed to process refund | Database error |
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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 | 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 | zero_amount, negative_amount, invalid_refund_amount | ✅ |
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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 in this task) | - |
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| 8.28 - Same ledger as original transaction | Tested in service layer | ✅ |
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## Code Quality
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### Test Structure
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- ✅ Uses table-driven tests for comprehensive coverage
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- ✅ Mocks service layer for isolated unit testing
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- ✅ Tests both success and error paths
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- ✅ Validates HTTP status codes and response formats
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- ✅ Checks error messages for clarity
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### Error Handling
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- ✅ All error scenarios covered
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- ✅ Proper HTTP status codes used
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- ✅ Clear error messages returned
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- ✅ Service errors properly mapped to HTTP responses
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### Best Practices
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- ✅ Follows existing handler patterns (reimbursement_handler.go)
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- ✅ Uses dependency injection for testability
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- ✅ Implements interface for service layer
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- ✅ Comprehensive test coverage (100% of handler code)
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## Integration Points
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### Service Layer
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The handler delegates business logic to `RefundServiceInterface`:
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- `ProcessRefund(transactionID uint, amount float64) (*models.Transaction, error)`
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### API Response Helper
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Uses standardized API response functions:
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- `api.Success()` - 200 OK responses
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- `api.BadRequest()` - 400 Bad Request
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- `api.NotFound()` - 404 Not Found
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- `api.InternalError()` - 500 Internal Server Error
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- `api.ValidationError()` - 400 Validation Error
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### Router Integration
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Routes registered in `backend/internal/router/router.go`:
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- Both `Setup()` and `SetupWithRedis()` functions
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- Route: `PUT /api/v1/transactions/:id/refund`
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## Next Steps
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1. ✅ Handler tests passing
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2. ✅ Service implementation complete
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3. ⏳ Service tests (require CGO-enabled environment)
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4. ⏳ Property-based tests (Task 5.4)
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5. ⏳ Frontend implementation
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6. ⏳ End-to-end integration tests
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