Fix Jest config, test script, and redisService mock for test suite

[Robinsonchiziterem]

#501 Pull Request

name: Pull Request
about: Submit changes to Soroban Playground
title: 'Fix Jest configuration and test suite failures'
labels: 'bug'
assignees: ''

What does this PR do?

• Updated jest.config.cjs to correctly handle ESM modules and added experimental VM options.
• Modified package.json test script to invoke Jest with required flags.
• Fixed the redisService mock in tests/syntheticAssets.unit.test.js to provide proper jest.fn() methods.
• Added missing babel.config.cjs and ensured it is used by Jest.
• Adjusted related source files (databaseService.js, redisService.js, syntheticAssetsService.js, logger.js) to align with the new test environment.
  These changes resolve the failing test suite and allow all unit, integration, and e2e tests to pass.

Related Issue

Closes #

Type of Change

• Bug fix
• New feature
• Documentation update
• Refactor / Code improvement
• Other (please describe):

🗂️ Affected Area(s)

• backend/ — Express API routes (/compile, /deploy, /invoke)
• frontend/ — Next.js UI / Monaco editor
• contracts/ — Example Soroban contracts
• .github/ — Templates, workflows, CI
• Documentation / README
• Other:

How Has This Been Tested?

• Ran npm test in the backend directory; all tests passed.
• Verified that Jest runs without configuration errors.
• Confirmed the mock behavior works as expected in unit tests.
• No new console errors or warnings observed.
• Tested in the browser (local dev server)
• Verified changes work across different missions
• Checked Monaco Editor behavior (if applicable)
• Ran all existing tests (npm test)
• No new console errors or warnings

Screenshots / Demo (if applicable)

Before

After

Checklist

• I have performed a self-review of my code
• I have commented my code where necessary
• I have updated the documentation (if needed)
• My changes do not introduce new warnings or errors
• New and existing tests pass locally

Related Issues or References

Additional Context

This PR addresses the failing test suite caused by Jest misconfiguration with ESM modules and an incorrectly mocked redisService. The changes are limited to the backend and test setup, ensuring no impact on the frontend or contracts.

Closes #501

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