[TESTING] Write unit tests for environment variable validation

[dev-fatima-24]

Priority: high

Description

The validateEnv() function must be tested to ensure it correctly identifies missing and malformed variables and exits with the right error messages.

Acceptance Criteria

• Test: all required variables present passes validation
• Test: missing required variable throws with the variable name
• Test: ADMIN_SECRET_KEY not starting with 'S' throws with a format error
• Test: STELLAR_NETWORK set to an invalid value throws
• Test: validation function is callable without side effects in test environment

[Tboy123-emm]

@Tboy123-emm has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

hello please i'd like to work on this issues

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[drips-wave]

Congratulations, @Tboy123-emm! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

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