Tests for the v9 implementation of UpdateData<T>

[MarkDuckworth]

Tests in this PR are being added to ensure that UpdateData does not regress. These tests do not evaluate any JS implementation, they only evaluate TS types, therefore you do not see any meaningful expect statements in these tests. Type behavior is asserted during the TS compilation, if the tests do not build then the tests are failing.

Empty assertions expect(true).to.be.true are included to avoid possible flagging of tests that do not perform assertions.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 84d5cad

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[google-oss-bot]

Size Report ¹

Affected Products

No changes between base commit (039f05f) and merge commit (8fceac9).

Test Logs

• Base (039f05f): https://github.com/firebase/firebase-js-sdk/actions/runs/5413452701
• Merge (8fceac9): https://github.com/firebase/firebase-js-sdk/actions/runs/5422971733

1. https://storage.googleapis.com/firebase-sdk-metric-reports/E2BqqS1XqE.html

[google-oss-bot]

Size Analysis Report ¹

Affected Products

No changes between base commit (039f05f) and merge commit (8fceac9).

Test Logs

• Base (039f05f): https://github.com/firebase/firebase-js-sdk/actions/runs/5413452701
• Merge (8fceac9): https://github.com/firebase/firebase-js-sdk/actions/runs/5422971733

1. https://storage.googleapis.com/firebase-sdk-metric-reports/lRSFH1O96z.html

[dconeybe]

Thanks for adding this test coverage! This is fantastic to reduce the risks of regression and definitely increases the confidence that #7318 works as expected.