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When enabled, the sensor sends a test pattern instead of doing a real exposure from the camera.
When a test pattern is enabled, all manual sensor controls specified by android.sensor.* will be ignored. All other controls should work as normal.
For example, if manual flash is enabled, flash firing should still occur (and that the test pattern remain unmodified, since the flash would not actually affect it).
Defaults to OFF.
Possible values:
Available values for this device:
CameraCharacteristics.SensorAvailableTestPatternModes
Optional - This value may be null on some devices.