[Bug]: Add Comprehensive Unit Tests for AES-256-GCM Encryption Module

[durdana3105]

Description:

The encryption utilities currently lack comprehensive automated test coverage. Cryptographic functions should be validated thoroughly to prevent regressions and ensure data integrity.

Test Cases to Cover

• Successful encryption and decryption round-trip.
• Empty string handling.
• Invalid ciphertext format handling.
• Authentication tag mismatch scenarios.
• Invalid environment configuration.
• Cross-function compatibility checks.
• Random IV generation validation.

Expected Solution

• Create unit tests using the project's testing framework.
• Cover both success and failure scenarios.
• Verify proper exception handling.
• Ensure test coverage for all exported functions.

Acceptance Criteria

• High test coverage for encryption utilities.
• All edge cases covered.
• CI pipeline passes successfully.
• Documentation includes testing instructions.

Please assign it to me under GSSoC.

[madsysharma]

/assign
I would like to work on this as part of GSSoC 2026.