How to set sensor values to test an automation behavior

How can I simulate sensor value changes, or create a synthetic sensor and change values, for testing automations and blueprints?
E.g. how can I simulate the battery % and battery low binary conditions changing values to trigger the automation?

You can always override the state of an any entity using Developer Tools, it will probably be overridden by its own integration in next sync, but at least, you can trigger automation.

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