tests: Enable type-checking on storage test functions.
By adding a simple type annotation to the test functions' signature.
Depends on !258 (closed).
Migrated from D4169 (view on Phabricator)
Staging instance, all changes can be removed at any time
By adding a simple type annotation to the test functions' signature.
Depends on !258 (closed).
Migrated from D4169 (view on Phabricator)