🧪 [testing improvement] Add missing tests for configuration flags

[MarsLuay]

🎯 What: Added missing tests for configuration flags (isStubMode and hasCollegeScorecardApiKey) in source/services/app/config.ts.
📊 Coverage: Covered happy paths, edge cases (e.g. empty strings, whitespace, null, undefined) and error conditions (case-insensitivity of 'STUB' API key). Used setup/teardown functions to modify and revert original configuration to ensure independent, deterministic tests without leaking state.
✨ Result: Enhanced the test suite coverage and overall reliability for configuration logic by catching real edge-case bugs for these simple pure functions.

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PR created automatically by Jules for task 2906516571757498423 started by @MarsLuay

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Project	Deployment	Actions	Updated (UTC)
gator-guide	Ready	Preview	Aug 27, 2026 12:20am

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