Add Cypress tests for fidesString overriding existing cookie

[gilluminate]

Ticket ENG-2487

Description Of Changes

Add comprehensive Cypress tests to verify that fidesString (notice consent string) correctly overrides existing cookie values during FidesJS initialization.

Code Changes

• Add new test suite "when Notice Consent string is found and takes precedence over existing cookie values"
• Test verifies fidesString overrides existing cookie consent values
• Test confirms API receives SCRIPT consent method with correct preferences
• Test validates cookie is updated with new values while preserving device ID
• Test checks modal UI displays correct overridden values

Steps to Confirm

1. Review the new test suite in consent-banner.cy.ts
2. Verify tests cover the scenario where existing cookie values are overridden by fidesString

Pre-Merge Checklist

• Issue requirements met
• All CI pipelines succeeded
• CHANGELOG.md updated
• UX feedback:
  • No UX review needed
• Followup issues:
  • No followup issues
• Database migrations:
  • No migrations
• Documentation:
  • No documentation updates required

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2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
fides-plus-nightly	Ignored	Preview	Feb 2, 2026 7:11pm
fides-privacy-center	Ignored		Feb 2, 2026 7:11pm

[greptile-apps]

Greptile Overview

Greptile Summary

This PR adds comprehensive Cypress test coverage for verifying that fidesString (notice consent string) correctly overrides existing cookie values during FidesJS initialization.

Changes Made

• Added new test suite "when Notice Consent string is found and takes precedence over existing cookie values" with 4 test cases
• Tests verify that fidesString preferences override existing cookie consent values
• Tests confirm API receives SCRIPT consent method with correct preferences
• Tests validate cookie updates with new values while preserving device ID
• Tests check modal UI displays correct overridden values
• Added changelog entry documenting the test additions

Test Quality

The tests follow established patterns in the codebase and provide good coverage of the fidesString override behavior. The test implementation is thorough, checking multiple aspects:

1. The in-memory consent object reflects the override
2. The API call includes the SCRIPT method and correct preferences
3. The cookie is updated appropriately
4. The UI displays the correct state

File Size Consideration

The test file consent-banner.cy.ts now exceeds 4300 lines. While these tests are valuable, consider creating separate test files for new test suites to improve maintainability.

Confidence Score: 4/5

• This PR is safe to merge with the minor consideration that the test file is becoming very large
• The changes add well-structured test coverage following existing patterns in the codebase. The tests are comprehensive and verify multiple aspects of the fidesString override behavior. The only concern is the growing size of the test file (4300+ lines), which is a maintainability consideration rather than a functional issue.
• No files require special attention - the test implementation follows established patterns

Important Files Changed

Filename	Overview
changelog/7290-automated-consent-tests.yaml	Added standard changelog entry for test additions
clients/privacy-center/cypress/e2e/fides-js/consent-banner.cy.ts	Added 130 lines of test coverage for fidesString overriding cookie values; file now exceeds 4300 lines

[greptile-apps]

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