Increase unit test coverage for facebook.ts to 100%

[mansisampat]

Discussion

• Add unit test coverage for facebook.ts
• 100% code coverage & branch coverage - https://screenshot.googleplex.com/BEGLg5FtTqDR27X

Testing

• Unit test passing locally.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 3860172

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

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[google-oss-bot]

Size Report ¹

Affected Products

No changes between base commit (3d44792) and merge commit (8822cf9).

Test Logs

• Base (3d44792): https://github.com/firebase/firebase-js-sdk/actions/runs/15922980258
• Merge (8822cf9): https://github.com/firebase/firebase-js-sdk/actions/runs/15923113662

1. https://storage.googleapis.com/firebase-sdk-metric-reports/QHuWW86cDi.html

[google-oss-bot]

Size Analysis Report ¹

Affected Products

No changes between base commit (3d44792) and merge commit (8822cf9).

Test Logs

• Base (3d44792): https://github.com/firebase/firebase-js-sdk/actions/runs/15922980258
• Merge (8822cf9): https://github.com/firebase/firebase-js-sdk/actions/runs/15923113662

1. https://storage.googleapis.com/firebase-sdk-metric-reports/5IYbJ1T0kh.html