test: add unit tests for cache module edge cases

[ulises-jeremias]

Context

Cache module has basic tests but missing: corrupted cache, permission denied, concurrent access, empty cache, TTL expiry.

Files to modify

• packages/create-awesome-node-app/tests/cache.test.mts
• packages/create-awesome-node-app/tests/cache-integration.test.mts

Test framework

Node.js native test runner via tsx --test

Verification

• npx tsx --test tests/cache.test.mts — all tests pass
• New edge cases covered

Steps

1. Cache module has basic tests but missing: corrupted cache, permission denied, concurrent access, empty cache, TTL expiry.
2. packages/create-awesome-node-app/tests/cache.test.mts
3. packages/create-awesome-node-app/tests/cache-integration.test.mts
4. Node.js native test runner via tsx --test
5. npx tsx --test tests/cache.test.mts — all tests pass
6. New edge cases covered

Acceptance criteria

• npx tsx --test tests/cache.test.mts — all tests pass
• New edge cases covered

Files

• packages/create-awesome-node-app/tests/cache.test.mts
• packages/create-awesome-node-app/tests/cache-integration.test.mts

Test framework

Node.js native test runner via tsx --test

Verification

• npx tsx --test tests/cache.test.mts — all tests pass
• New edge cases covered

How to verify

• npx tsx --test tests/cache.test.mts — all tests pass
• New edge cases covered

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Original issue text

Description

Cache module has basic tests but missing: corrupted cache, permission denied, concurrent access, empty cache, TTL expiry.

Files to modify

• packages/create-awesome-node-app/tests/cache.test.mts
• packages/create-awesome-node-app/tests/cache-integration.test.mts

Test framework

Node.js native test runner via tsx --test

Verification

• npx tsx --test tests/cache.test.mts — all tests pass
• New edge cases covered