test(api validation): check query validation boundaries for ?theme= parameter (Variation 2)

[souravjhahind]

🧩 Background

Input validation prevents arbitrary code and path traversal sequences from reaching the application core logic.

🎯 Objective

Write a schema-level validation test targeting the ?theme= parameter under valid enum list check.

📁 Files to touch

• app/api/streak/route.test.ts
• lib/validations.test.ts

🛠️ Implementation steps

• Mock a request passing the invalid value: 'nonexistent_theme_name'.
• Assert that the validation handler returns a 400 Bad Request listing allowed themes.

✅ Definition of done

• 1 new test case targeting the query input parameter.
• All endpoint test suites pass successfully.

[vib3withsimran]

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📋 #1491 — test(calculate): verify streak formulas for leap year transition timeline (Variation 3)
📋 #1463 — test(api validation): check query validation boundaries for ?theme= parameter (Variation 5)
📋 #1426 — test(mongodb): verify User schema behaviors under connection state 3 (disconnecting) (Variation 5)