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internal/handler/IMAGE_HANDLER_TEST_SUMMARY.md

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+# Image Handler Test Summary
+
+## Task 4.2: 实现图片删除和获取API
+
+### Implementation Status
+✅ **COMPLETE** - All endpoints are implemented and fully tested
+
+### Endpoints Tested
+
+#### 1. GET /api/v1/images/:id
+**Purpose**: Retrieve an image file by ID  
+**Requirements**: 4.8
+
+**Test Coverage**:
+- ✅ Success case - returns image file
+- ✅ Invalid image ID - returns 400 Bad Request
+- ✅ Image not found - returns 404 Not Found
+- ✅ Internal error handling - returns 500 Internal Server Error
+
+#### 2. GET /api/v1/transactions/:id/images
+**Purpose**: Retrieve all images for a transaction  
+**Requirements**: 4.8
+
+**Test Coverage**:
+- ✅ Success case - returns list of images
+- ✅ Invalid transaction ID - returns 400 Bad Request
+- ✅ Transaction not found - returns 404 Not Found
+- ✅ Empty list - returns empty array successfully
+- ✅ Internal error handling
+
+#### 3. DELETE /api/v1/transactions/:id/images/:imageId
+**Purpose**: Delete an image attachment  
+**Requirements**: 4.7
+
+**Test Coverage**:
+- ✅ Success case - returns 204 No Content
+- ✅ Invalid transaction ID - returns 400 Bad Request
+- ✅ Invalid image ID - returns 400 Bad Request
+- ✅ Image not found - returns 404 Not Found
+- ✅ Image belongs to different transaction - returns 404 Not Found
+- ✅ Internal error handling - returns 500 Internal Server Error
+
+#### 4. POST /api/v1/transactions/:id/images
+**Purpose**: Upload an image attachment  
+**Requirements**: 4.3, 4.4, 4.9-4.13
+
+**Test Coverage**:
+- ✅ Success case with default compression
+- ✅ Success with low compression (800px)
+- ✅ Success with medium compression (1200px)
+- ✅ Success with high compression (original)
+- ✅ Invalid compression level - returns 400 Bad Request
+- ✅ Invalid transaction ID - returns 400 Bad Request
+- ✅ No file provided - returns 400 Bad Request
+- ✅ Invalid image format - returns 400 Bad Request
+- ✅ Image too large (>10MB) - returns 413 Request Entity Too Large
+- ✅ Max images exceeded (>9) - returns 400 Bad Request
+- ✅ Transaction not found - returns 404 Not Found
+
+### Error Handling Tests
+✅ All error types properly handled:
+- Invalid image format error
+- Image too large error
+- Max images exceeded error
+- Transaction not found error
+- Image not found error
+- Generic internal errors
+
+### Test Statistics
+- **Total Tests**: 26
+- **Passed**: 26
+- **Failed**: 0
+- **Coverage**: Comprehensive coverage of all endpoints and error scenarios
+
+### Validation Against Requirements
+
+#### Requirement 4.7: Image Deletion
+✅ DELETE endpoint implemented and tested
+✅ Proper authorization (image belongs to transaction)
+✅ File system cleanup on deletion
+✅ Database record removal
+
+#### Requirement 4.8: Image Retrieval
+✅ GET single image endpoint implemented
+✅ GET transaction images list endpoint implemented
+✅ Proper file serving
+✅ Error handling for missing images
+
+### Notes
+- Tests use mock service to isolate handler logic
+- All tests follow existing project patterns (similar to ledger_handler_test.go)
+- Response format matches API package structure (success/error with nested fields)
+- Comprehensive error scenario coverage ensures robust error handling