Fix mutating beforeSubscribe Query

[dblythy]

Fixes #6866, and now allows returning a new query.

Also adds additional test cases for beforeSubscribe. Failing tests are not related to this PR.

@mtrezza, any other tests required to make sure it's 100%?

[dplewis]

@dblythy Can you rebase from master branch? This will fix the failing tests.

[dblythy]

@dplewis thank you for fixing the other tests! Still one test failing for me:

1. Parse.Push does not get stuck with _PushStatus 'running' on many installations added
   Message:
   Expected 'running' to equal 'succeeded'

Is this related to my PR?

[mtrezza]

Is this related to my PR?

Most likely not. You can try to close and reopen this PR and see whether the test passes. We are having an issue with intermittently failing test cases which may be the reason why this test fails.

[davimacedo]

I believe this PR is failing for Postgres tests.

[dblythy]

Any ideas why @davimacedo? The travis-ci logs aren't providing anything useful.

[davimacedo]

Nevermind. It was actually intermittently failing.

[codecov]

Codecov Report

Merging #6868 into master will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #6868      +/-   ##
==========================================
+ Coverage   93.78%   93.81%   +0.02%     
==========================================
  Files         168      168              
  Lines       12185    12189       +4     
==========================================
+ Hits        11428    11435       +7     
+ Misses        757      754       -3     

Impacted Files	Coverage Δ
src/triggers.js	92.20% <100.00%> (+0.10%)	⬆️
src/Adapters/Storage/Mongo/MongoStorageAdapter.js	93.58% <0.00%> (+0.66%)	⬆️

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[dplewis]

I restarted the job. Looks good.

[dblythy]

Thank you gents!!