LAYER4 TEST LIST TOP 3 5 P

Here’s the concise list of top 3-5 tests from each category:

Basic Jason Validation Tests

• test “validates simple valid JSON object with Jason”
• test “validates nested JSON structures with Jason”
• test “validates all JSON primitive types with Jason”

Fast Path Optimization Tests

• test “fast path succeeds on clean JSON from previous layers”
• test “fast path returns parsed Elixir terms correctly”
• test “fast path processes large valid JSON efficiently”

Jason Decode Error Handling Tests

• test “handles Jason.DecodeError for invalid JSON syntax”
• test “handles Jason.DecodeError for truncated JSON”
• test “handles Jason.DecodeError for unquoted keys”
• test “handles Jason.DecodeError for Python-style booleans”

Pass-Through Behavior Tests

• test “returns {:continue, input, context} for malformed JSON”
• test “preserves input exactly when passing through”
• test “preserves context repairs from previous layers”
• test “doesn’t add repairs when validation fails”

Edge Cases and Error Conditions Tests

• test “handles nil input gracefully”
• test “handles very large JSON input”
• test “handles JSON with maximum nesting depth”

UTF-8 and Encoding Tests

• test “validates JSON with UTF-8 characters correctly”
• test “validates JSON with emoji characters”
• test “handles malformed UTF-8 sequences gracefully”

Integration with Previous Layers Tests

• test “processes output from Layer 3 (Syntax Normalization)”
• test “validates repaired JSON from all previous layers”
• test “preserves repair history from previous layers”
• test “handles layered repair combinations”

Performance and Efficiency Tests

• test “validation completes within performance thresholds”
• test “fast path is significantly faster than full parsing”
• test “validation doesn’t leak memory on repeated calls”

LayerBehaviour Contract Tests

• test “implements process/2 with correct signature”
• test “implements supports?/1 correctly”
• test “implements priority/0 returning 4”
• test “returns proper layer_result types”

Option Validation Tests

• test “validates jason_options parameter”
• test “validates fast_path_optimization option”
• test “rejects invalid option keys”

Security and Safety Tests

• test “handles malicious JSON input safely”
• test “prevents JSON bomb attacks”
• test “prevents excessive memory allocation”

Real-World Scenario Tests

• test “validates API response JSON”
• test “validates configuration file JSON”
• test “validates user input JSON”

Concurrent Access Tests

• test “handles multiple simultaneous validations”
• test “thread safety across validation calls”
• test “no shared state corruption”

Total: 40 essential test cases covering all critical aspects of Layer 4 validation