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One test per AC of specs/fronius-sunspec.md, named test_AC_<n>_<what>. Definition criteria (value ranges, thing classes, defaults) are checked by re-reading integrationpluginsunspec.json. Behaviour criteria run either on a model 124 register dump fed to the real libnymea-sunspec model, or on the pure logic units the plugin is about to grow. All red at this point: sunspecstoragelogic and froniusrules do not exist yet, so the suite does not compile. That is the expected starting state.