eiri opened a new pull request #1273: Adopt fake_db to PSE changes
URL: https://github.com/apache/couchdb/pull/1273
   ## Overview
   With db headers moved into engine's state, any `fake_db` call that is trying 
to setup sequences for tests (e.g. in mem3_shards) crashing with context setup 
   It's not trivial to compose a proper `engine` field outside of couch app, so 
instead this fix makes `fake_db` to set engine transparently, unless it 
provided explicitly in a payload.
   ## Testing recommendations
   Without this change running `make eunit apps=mem3 suites=mem3_shards` would 
crash with 
       *** context setup failed ***
   **in function erlang:setelement/3
     called as setelement(undefined,{db,1,<<"dbs">>,undefined,
   in call from test_util:'-fake_db/1-fun-0-'/3 (src/test_util.erl, line 244)
   in call from lists:foldl/3 (lists.erl, line 1261)
   in call from mem3_shards:setup_changes/0 (src/mem3_shards.erl, line 738)
     [done in 1.194 s]
     Failed: 0.  Skipped: 0.  Passed: 10.
   This was not exposed by travis because in eunit crash in context setup 
doesn't count as a failure.
   With this change the same command should pass successfully with `All 11 
tests passed.`
   ## Checklist
   - [x] Code is written and works correctly;
   - [x] Changes are covered by tests;
   - [ ] Documentation reflects the changes;

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