test(firestore): simplify firestore tests

[russellwheatley]

Description

Cleaned up rules so that only a single collection (firestore) & a single collection group (collectionGroup) is used for tests.

Related issues

As per this comment

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes
• My change supports the following platforms;
  • Android
  • iOS
• My change includes tests;
  • e2e tests added or updated in packages/\*\*/e2e
  • jest tests added or updated in packages/\*\*/__tests__
• I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • Yes
  • No

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[mikehardy]

This looks good in general but is failing in CI:

  1) firestore.collection().add()
       adds a new document:
     NativeFirebaseError: [firestore/permission-denied] The caller does not have permission to execute the specified operation.
      at FirestoreDocumentReference.set (http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false&sourceMapURL=true:188225:39)

[codecov]

Codecov Report

Merging #4133 into master will decrease coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4133      +/-   ##
==========================================
- Coverage   67.10%   67.05%   -0.05%     
==========================================
  Files         114      114              
  Lines        3820     3820              
  Branches      278      278              
==========================================
- Hits         2563     2561       -2     
- Misses       1148     1150       +2     
  Partials      109      109              

[russellwheatley]

There are two bugs associated with this PR that conspired to throw me off the scent. One is a Firestore emulator UI bug that I've filed here.

The other is a reset of the Firestore settings at this point which meant that, for iOS at least, we are still using the remote database 😅 .

[mikehardy]

not terribly relevant, but cocoapods has been stuck on 1.10.0-rc.1 for 29 days now, thought for sure it would be out. Anyway, this change doesn't really matter one way or the other and is not incorrect, just a comment

[mikehardy]

This looks great and I suppose sets us up to more easily implement the new firestore operators they just added (there's always something to do... 😅 ) - thanks, I'll shepherd it through CI and get it merged