loader.core.tests: Add loader core fixtures to ease loaders' tests
This adds 2 mixins:
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One to setup the loader data to ingest and check for the state after loading
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Another one to inhibit the self.storage calls from the loader-core implementation
Related #1238 (closed)
Test Plan
None for now (I focused on refactoring the modules depending on it). I will add some later if i found out how to actually do it.
Migrated from D467 (view on Phabricator)