Context
HomeDBManager lacks of direct tests, which makes hard to make rework or refactorations.
Proposed solution
Specifically here, I introduce tests which call exposed UsersManager methods directly and check their result.
Also:
I removed updateUserName which seems to me useless (updateUser does the same work)
Taking a look at the getUserByLogin methods, it appears that Typescirpt infers it returns a Promise<User|null> while in no case it may resolve a nullish value, therefore I have forced to return a Promise<User> and have changed the call sites to reflect the change.
Related issues
I make this change for then working on #870
Summary:
Before this change we would always say there are 14 days remaining,
regardless of how many actually are remaining. Let's pass around a
different `dataLimitsInfo` object that also reports the number of days
remaining.
Test Plan: Ensure the test suite passes.
Reviewers: georgegevoian
Reviewed By: georgegevoian
Differential Revision: https://phab.getgrist.com/D4332
