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BQ25619: How to test the power efficiency of boost mode and charger mode?

Part Number: BQ25619

I have a BQ25619EVM and don't have lithium battery, My laboratory equipment includes:

one electric load,

one digital power supply,

one voltmeter

one oscilloscope.

I wander:

How to test the power efficiency of boost mode in light load?(without battery), my electric load settable current is 1.5mA, how can I create a uA level load? connect a big resistor in PMID?

How to test the power efficiency of charger mode ?(without battery)

when I pull CE pin to ground(disable charger mode as datasheet shows), what happened in the internal of BQ25619?Just charging logic be disabled? can I use boost mode at this time?