9.4Testing Strategies for Camera/Voice in CI

Feature	Emulator Testing	Real Device Testing	Approach
Voice commands	Inject audio files	Use device microphone	Test NLU layer in unit tests, inject audio in integration
Barcode scanning	Inject images via camera API	Present barcode to physical camera	Use virtual camera on emulators
AR features	Limited (no depth sensors)	Required for real AR	Test AR SDK integration, mock AR session
Face detection	Inject face images	Real camera needed	Use pre-processed images for ML model testing
Document capture	Inject document images	Real camera for quality testing	Test OCR pipeline separately from capture

The common pattern: decouple the capture mechanism (camera, microphone) from the processing logic (barcode decoding, speech-to-text, ML inference). Unit test the processing logic with known inputs. Integration test the capture pipeline on real devices in cloud device farms.