Restore export-csv tests

[rfontanarosa]

No description provided.

[gemini-code-assist]

Summary of Changes

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This pull request reactivates the previously ignored integration tests for the export-csv cloud function. It introduces a new mock data fetching utility to accurately simulate Firestore behavior within the test environment, allowing for robust testing of the CSV export logic.

Highlights

• Test File Restoration: The export-csv.spec.ts.ignore file was renamed to export-csv.spec.ts, effectively re-enabling the previously ignored tests for the CSV export functionality.
• Mock Data Fetching Utility: A new asynchronous generator function, fetchLoisSubmissionsFromMock, was introduced to simulate fetching and joining LOIs and submissions from a mock Firestore instance, crucial for testing the exportCsvHandler without relying on complex Firestore queries.
• Test Setup Integration: The beforeEach hook was updated to use the new fetchLoisSubmissionsFromMock function, ensuring that the exportCsvHandler tests utilize the mock data fetching logic.

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Changelog

• functions/src/export-csv.spec.ts
  • Renamed the file from export-csv.spec.ts.ignore to export-csv.spec.ts.
  • Updated import statements, including adding getDatastore and QueryDocumentSnapshot.
  • Introduced fetchLoisSubmissionsFromMock to simulate data fetching for tests.
  • Modified the beforeEach hook to use the new mock data fetching function.
  • Applied minor formatting adjustments to object literals and function calls.

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[gemini-code-assist]

Code Review

This pull request restores the tests for CSV export by renaming the spec file and providing a mock implementation for fetchLoisSubmissions that works with mock-cloud-firestore. The approach is sound, but I found a logic bug in the new mock implementation that could lead to incorrect test results under certain data conditions. My review includes a comment with a suggested fix for this issue.