EUnit couchdb_views_tests failure: suspend_process after termination

[wohali]

https://travis-ci.org/apache/couchdb/jobs/250135101#L3825

  View group shutdown
    couchdb_views_tests:315: couchdb_1283...*failed*
in function erlang:suspend_process/1
  called as suspend_process(<0.27290.0>)
in call from couchdb_views_tests:'-couchdb_1283/0-fun-21-'/0 (test/couchdb_views_tests.erl, line 381)
**error:badarg
  output:<<"">>

Analysis of the logfile shows the compaction completes in just 200ms:

[info] 2017-07-04T21:35:33.260737Z nonode@nohost <0.27290.0> -------- Compaction started for db: eunit-test-db-1499204132844268 idx: _design/foo
[info] 2017-07-04T21:35:33.262754Z nonode@nohost <0.27290.0> -------- Compaction finished for db: eunit-test-db-1499204132844268 idx: _design/foo

so my hunch is that it is already gone by the time we call erlang:suspend_process. This test is racey.

Possible Solution

@rnewson says on IRC we could spawn it with {hibernate_after,0} but that only works for gen_server:start_link|start|enter_loop, and we'd have to get deep inside couch_index_server to do that, I think.

We could bump up the populate_db to 1000 or 10000 documents as a workaround.

[wohali]

Another instance:

• https://travis-ci.org/apache/couchdb/jobs/250437020

[wohali]

I believe these are being caused by #652.

[wohali]

Closing because PR#654 landed. Will reopen if it recurs.