File Upload Test Cases
File uploads are a common attack vector. Proper testing ensures you accept valid files while blocking malicious content and edge cases.
Basic Upload Tests
Start with fundamental upload functionality:
- Valid file type uploads successfully
- Uploaded file appears in expected location
- File metadata (name, size, type) preserved
- Upload progress indicator works
- Multiple file upload functions correctly
- Drag and drop upload works
Validation and Security Tests
Protect against malicious uploads:
- Disallowed file types rejected
- File size exceeding limit rejected
- Executable files blocked regardless of extension
- Filename sanitized to prevent path traversal
- MIME type validated (not just extension)
- Uploaded files scanned for malware
- Double extensions handled (file.jpg.exe)
Edge Cases and Error Handling
Handle unusual scenarios gracefully:
- Empty file (0 bytes) handled appropriately
- Network interruption during upload
- Browser tab closed during upload
- Filename with special characters
- Very long filename
- Upload quota/storage limit reached
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