LAYER4 TEST LIST

Looking at the repository structure and existing layer tests, here’s an exhaustive list of tests for Layer 4 (Validation using Jason):

Basic Jason Validation Tests

• test “validates simple valid JSON object with Jason”
• test “validates simple valid JSON array with Jason”
• test “validates valid JSON string literal with Jason”
• test “validates valid JSON number literal with Jason”
• test “validates valid JSON boolean literal with Jason”
• test “validates valid JSON null literal with Jason”
• test “validates empty JSON object with Jason”
• test “validates empty JSON array with Jason”
• test “validates nested JSON objects with Jason”
• test “validates nested JSON arrays with Jason”
• test “validates mixed nested structures 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 preserves original data types (strings, numbers, booleans)”
• test “fast path handles Unicode characters correctly”
• test “fast path processes large valid JSON efficiently”
• test “fast path maintains precision for floating point numbers”
• test “fast path handles scientific notation numbers”
• test “fast path processes very long strings”
• test “fast path handles deeply nested valid structures”
• test “fast path processes arrays with many elements”

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 malformed strings”
• test “handles Jason.DecodeError for invalid escape sequences”
• test “handles Jason.DecodeError for unclosed objects”
• test “handles Jason.DecodeError for unclosed arrays”
• test “handles Jason.DecodeError for trailing commas”
• test “handles Jason.DecodeError for unquoted keys”
• test “handles Jason.DecodeError for single quotes”
• test “handles Jason.DecodeError for Python-style booleans”
• test “handles Jason.DecodeError for Python-style null values”
• test “handles Jason.DecodeError for extra closing delimiters”
• test “handles Jason.DecodeError for mismatched delimiters”
• test “handles Jason.DecodeError for comments in JSON”
• test “handles Jason.DecodeError for control characters”

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 “preserves context options when passing through”
• test “preserves context metadata when passing through”
• test “doesn’t add repairs when validation fails”
• test “doesn’t modify context when passing through”
• test “passes through empty input”
• test “passes through whitespace-only input”
• test “passes through non-JSON text”

Edge Cases and Error Conditions Tests

• test “handles nil input gracefully”
• test “handles non-string input gracefully”
• test “handles empty string input”
• test “handles very large JSON input”
• test “handles JSON with maximum nesting depth”
• test “handles JSON with very long keys”
• test “handles JSON with very long string values”
• test “handles JSON with many array elements”
• test “handles JSON with many object properties”
• test “handles JSON with Unicode surrogate pairs”

UTF-8 and Encoding Tests

• test “validates JSON with UTF-8 characters correctly”
• test “validates JSON with emoji characters”
• test “validates JSON with accented characters”
• test “validates JSON with CJK characters”
• test “validates JSON with RTL script characters”
• test “validates JSON with combining characters”
• test “validates JSON with mathematical symbols”
• test “validates JSON with currency symbols”
• test “handles malformed UTF-8 sequences gracefully”
• test “validates JSON with all Unicode categories”

Data Type Validation Tests

• test “validates and preserves integer values”
• test “validates and preserves floating point values”
• test “validates and preserves very large numbers”
• test “validates and preserves very small numbers”
• test “validates and preserves negative numbers”
• test “validates and preserves zero values”
• test “validates and preserves scientific notation”
• test “validates and preserves boolean true”
• test “validates and preserves boolean false”
• test “validates and preserves null values”
• test “validates and preserves empty strings”
• test “validates and preserves strings with special characters”

JSON Schema Compliance Tests

• test “validates RFC 7159 compliant JSON”
• test “validates ECMA-404 compliant JSON”
• test “rejects JSON with duplicate keys according to settings”
• test “handles JSON with escape sequences correctly”
• test “validates proper quote usage”
• test “validates proper delimiter usage”
• test “validates proper whitespace handling”
• test “validates proper number formatting”
• test “validates proper string formatting”
• test “validates proper array formatting”

Integration with Previous Layers Tests

• test “processes output from Layer 1 (Content Cleaning)”
• test “processes output from Layer 2 (Structural Repair)”
• test “processes output from Layer 3 (Syntax Normalization)”
• test “validates repaired JSON from all previous layers”
• test “preserves repair history from previous layers”
• test “maintains context consistency across layers”
• test “handles edge cases from previous layer outputs”
• test “validates complex repaired structures”
• test “processes mixed syntax repairs correctly”
• test “handles layered repair combinations”

Performance and Efficiency Tests

• test “validation completes within performance thresholds”
• test “memory usage stays within limits”
• test “handles concurrent validation requests”
• test “scales with input size appropriately”
• test “fast path is significantly faster than full parsing”
• test “validation doesn’t leak memory on repeated calls”
• test “performs efficiently on pathological inputs”
• test “timeout protection works for very large inputs”
• test “CPU usage is reasonable for complex JSON”
• test “garbage collection pressure is minimal”

Jason Configuration Tests

• test “uses appropriate Jason decode options”
• test “configures Jason for UTF-8 handling”
• test “configures Jason for number precision”
• test “configures Jason for string handling”
• test “configures Jason for array handling”
• test “configures Jason for object handling”
• test “applies context-specific decode options”
• test “handles Jason configuration errors”
• test “uses optimized Jason settings for performance”
• test “configures Jason for security considerations”

Error Recovery and Resilience Tests

• test “recovers gracefully from Jason crashes”
• test “handles Jason timeout conditions”
• test “handles Jason memory pressure”
• test “handles Jason internal errors”
• test “maintains stability under stress”
• test “handles unexpected Jason exceptions”
• test “recovers from partial decode failures”
• test “handles Jason version compatibility issues”
• test “manages Jason dependency failures”
• test “handles system resource exhaustion”

LayerBehaviour Contract Tests

• test “implements process/2 with correct signature”
• test “implements supports?/1 correctly”
• test “implements priority/0 returning 4”
• test “implements name/0 returning ‘Validation’”
• test “implements validate_options/1 correctly”
• test “returns proper layer_result types”
• test “maintains repair_context format”
• test “follows layer behavior protocol”
• test “integrates with pipeline correctly”
• test “maintains layer ordering requirements”

Option Validation Tests

• test “validates jason_options parameter”
• test “validates fast_path_optimization option”
• test “validates validate_encoding option”
• test “validates timeout_ms option”
• test “validates max_input_size option”
• test “rejects invalid option keys”
• test “rejects invalid option values”
• test “handles empty options list”
• test “merges options with defaults correctly”
• test “validates option type constraints”

Repair Action Tracking Tests

• test “doesn’t generate repairs on successful validation”
• test “maintains repair context from previous layers”
• test “preserves repair action format”
• test “updates context metadata correctly”
• test “tracks layer processing status”
• test “maintains repair ordering”
• test “preserves repair positions”
• test “handles repair context edge cases”
• test “validates repair action structure”
• test “maintains context consistency”

Security and Safety Tests

• test “handles malicious JSON input safely”
• test “prevents JSON bomb attacks”
• test “prevents excessive memory allocation”
• test “prevents stack overflow on deep nesting”
• test “handles untrusted input securely”
• test “prevents code injection through JSON”
• test “validates input size limits”
• test “prevents denial of service attacks”
• test “handles binary data in JSON safely”
• test “prevents resource exhaustion”

Real-World Scenario Tests

• test “validates API response JSON”
• test “validates configuration file JSON”
• test “validates user input JSON”
• test “validates generated JSON from templates”
• test “validates JSON from external systems”
• test “validates JSON from databases”
• test “validates JSON from file systems”
• test “validates JSON from network requests”
• test “validates JSON from message queues”
• test “validates JSON from log files”

Boundary Condition Tests

• test “handles minimum valid JSON”
• test “handles maximum practical JSON size”
• test “handles zero-length keys”
• test “handles maximum key length”
• test “handles zero-length values”
• test “handles maximum value length”
• test “handles minimum array size”
• test “handles maximum array size”
• test “handles minimum object size”
• test “handles maximum object size”

Concurrent Access Tests

• test “handles multiple simultaneous validations”
• test “thread safety across validation calls”
• test “no shared state corruption”
• test “concurrent performance characteristics”
• test “race condition prevention”
• test “deadlock prevention”
• test “resource contention handling”
• test “memory isolation between calls”
• test “state independence verification”
• test “parallel processing efficiency”

Diagnostic and Debug Tests

• test “provides useful error messages”
• test “includes position information in errors”
• test “helps diagnose JSON syntax issues”
• test “provides performance metrics”
• test “supports debugging complex inputs”
• test “logs appropriate information”
• test “tracks validation statistics”
• test “provides error context”
• test “supports troubleshooting workflows”
• test “enables validation monitoring”

Regression Prevention Tests

• test “handles previously problematic inputs”
• test “validates against known edge cases”
• test “prevents performance regressions”
• test “maintains compatibility with Jason updates”
• test “handles version upgrade scenarios”
• test “validates against security vulnerabilities”
• test “prevents memory leak regressions”
• test “maintains API stability”
• test “handles breaking change scenarios”
• test “validates long-term stability”

Integration Testing with Jason

• test “works with current Jason version”
• test “handles Jason configuration correctly”
• test “uses Jason APIs appropriately”
• test “handles Jason errors properly”
• test “leverages Jason performance optimizations”
• test “follows Jason best practices”
• test “handles Jason edge cases”
• test “integrates with Jason error handling”
• test “uses Jason efficiently”
• test “maintains Jason compatibility”

Total: 200+ comprehensive test cases covering all aspects of Layer 4 validation functionality