Use in-memory history in the blog-utils lib

[willdurand]

This fixes a regression introduced in #13638

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.13%. Comparing base (8375884) to head (3b5d38f).
⚠️ Report is 6 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #14251   +/-   ##
=======================================
  Coverage   98.12%   98.13%           
=======================================
  Files         266      266           
  Lines       10648    10648           
  Branches     3287     3287           
=======================================
+ Hits        10448    10449    +1     
+ Misses        187      186    -1     
  Partials       13       13           

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[diox]

Could add a test for this with some mock in tests/unit/blog-utils/test_index.js ? Replicating the failure we had with building addons-blog without that patch (which does seem to fix the issue)

[willdurand]

Could add a test for this with some mock in tests/unit/blog-utils/test_index.js ? Replicating the failure we had with building addons-blog without that patch (which does seem to fix the issue)

Yeah, good call obviously. Added, thanks!