verification/api/tests/api_verification_roadmap.md

# Scientific Verification Roadmap — API Subsystem

This document defines the complete scientific verification roadmap for the API subsystem. It maps every endpoint, middleware, and communication mechanism to its required verification methodologies and explains the scientific rationale for each testing strategy.

---

1. Verification Roadmap Overview & Execution Phases

┌────────────────────────────────────────────────────────────────────────────────────────┐
│ Phase 1: Reference Verification & Contract Schema Validation                           │
│ Assert OpenAPI 3.1.0 schema compliance, type bounds, and strict field constraints.    │
└───────────────────────────────────┬────────────────────────────────────────────────────┘
                                    │
┌───────────────────────────────────▼────────────────────────────────────────────────────┐
│ Phase 2: Property-Based Invariant Testing (Hypothesis)                                 │
│ Verify 10 mathematical and structural system invariants across 100+ random samples.   │
└───────────────────────────────────┬────────────────────────────────────────────────────┘
                                    │
┌───────────────────────────────────▼────────────────────────────────────────────────────┐
│ Phase 3: Adversarial Robustness & Security Testing                                     │
│ Execute 80+ attacks across 10 security categories (injection, auth, flood, etc.).    │
└───────────────────────────────────┬────────────────────────────────────────────────────┘
                                    │
┌───────────────────────────────────▼────────────────────────────────────────────────────┐
│ Phase 4: High-Throughput Performance & Concurrency Benchmarking                       │
│ Measure p50/p95/p99 latencies, GIL non-blocking scaling, SerDe costs, and tracemalloc. │
└───────────────────────────────────┬────────────────────────────────────────────────────┘
                                    │
┌───────────────────────────────────▼────────────────────────────────────────────────────┐
│ Phase 5: Production Readiness & Operational Verification                               │
│ Validate readiness HTTP 503 probes, RFC headers, mTLS, DDoS, and logging pipelines.   │
└────────────────────────────────────────────────────────────────────────────────────────┘

---

2. Component-by-Component Verification Roadmap

2.1 Middleware & Infrastructure Layer

Component	Endpoint / Target	Primary Verification Methods	Rationale & Scientific Justification
Global Exception Handler	Global HTTP Interceptor	Unit, Property-Based, Security	Validates that unhandled exceptions are caught and transformed into RFC 7807 problem details without leaking stack traces or plain-text errors.
Content-Type Filter	Mutating routes (POST/PUT/PATCH)	Robustness, Security, Contract	Ensures non-JSON payloads are rejected with HTTP 415 at the edge before JSON parsing executes.
Trace Context	Global Request Interceptor	Integration, API Contract	Verifies W3C traceparent headers are generated or propagated across all HTTP responses for distributed tracing.
mTLS Verification	Sensitive Banking Routes	Security, Robustness	Validates in-app client certificate fingerprint checking and CRL revocation list enforcement against spoofed headers.
DDoS Throttling	Global Client IP Limiter	Load Testing, Robustness	Asserts sliding-window rate limiting triggers HTTP 429 and X-DDoS-Throttled headers during volumetric request bursts.
Prometheus Telemetry	GET /metrics	Contract, Integration	Confirms OpenMetrics text exports contain http_request_duration_seconds histograms and domain metrics.

---

2.2 Core Application Endpoints

Health & Readiness Probes (health.py)

• Target Endpoints: GET /health, GET /health/ready
• Verification Methods: Unit Testing, Integration Testing, Reproducibility Testing.
• Rationale: Ensures /health always returns HTTP 200 for liveness probes, while /health/ready dynamically returns HTTP 503 when Redis or PostgreSQL connections fail.

ML Prediction & Risk Scoring (predict.py)

• Target Endpoints: POST /api/v1/predict, POST /api/v1/score-transaction
• Verification Methods: Property-Based Testing, Performance Benchmarking, Robustness Testing, Schema Validation.
• Rationale:
  • Property-Based: Verifies fraud_probability ∈ [0, 1] and risk_score ∈ [0, 1000] for all input combinations.
  • Performance: Confirms PyTorch forward pass offloading via asyncio.to_thread maintains non-blocking event loop execution under multi-thread load.
  • Robustness: Validates background task feature ingestion prevents rolling score drift on identical transaction replays.

Alert Management (alerts.py)

• Target Endpoints: GET /api/v1/alerts, POST /api/v1/alerts, GET /api/v1/alerts/{alert_id}/explainability
• Verification Methods: Unit Testing, API Contract Testing, Schema Validation.
• Rationale: Ensures invalid query string enum values (e.g. severity=INVALID) return HTTP 422 instead of unhandled HTTP 500, and verifies SHAP/LIME feature breakdown format.

Case Management (cases.py)

• Target Endpoints: POST /api/v1/cases, PUT /api/v1/cases/{case_id}/status, POST /api/v1/cases/{case_id}/notes
• Verification Methods: Integration Testing, Reproducibility Testing, Security Testing.
• Rationale: Tests Idempotency-Key header deduplication (24h TTL) across concurrent replay requests, ensuring duplicate cases are not created.

Security & Audit Chain (security.py)

• Target Endpoints: POST /security/abac/evaluate, POST /security/audit-chain/verify, GET /security/status
• Verification Methods: Security Testing, Property-Based Testing, Unit Testing.
• Rationale: Proves ABAC multi-tenant bank isolation mathematically denies cross-bank requests, and verifies SHA-256 hash chain remains valid across sequential logs.

Gateway Reverse Proxy (gateway.py)

• Target Endpoints: ANY /{path:path}
• Verification Methods: Security Testing, API Contract Testing, Load Testing.
• Rationale: Verifies OIDC JWT bearer authentication, API key validation, downstream route proxying, and RFC-compliant X-RateLimit-* header injection.

Federated Learning & Simulation (simulation.py, training.py)

• Target Endpoints: GET /api/v1/simulations, POST /api/v1/training/round
• Verification Methods: Integration Testing, Property-Based Testing.
• Rationale: Ensures FL simulation parameter configurations maintain differential privacy budget bounds (epsilon <= max_epsilon).

Entity Resolution & Graph Intelligence (entities.py, graph.py)

• Target Endpoints: GET /api/v1/entities, GET /api/v1/graph
• Verification Methods: Schema Validation, Performance Benchmarking.
• Rationale: Confirms PII is never exposed in entity resolution (hashes only) and graph traversal depth limits prevent memory allocation spikes.

PSD2 SCA & Compliance (psd2.py, compliance.py)

• Target Endpoints: GET /api/v1/psd2/sca, GET /api/v1/compliance
• Verification Methods: Unit Testing, Schema Validation.
• Rationale: Asserts PSD2 Strong Customer Authentication (SCA) exemptions strictly adhere to EBA Regulatory Technical Standards (RTS) risk thresholds.

Real-Time WebSockets (streaming_ws.py, training_ws.py)

• Target Endpoints: GET /ws/stream, GET /ws/training
• Verification Methods: Integration Testing, Security Testing.
• Rationale: Verifies WebSocket query string token authentication and graceful handling of abrupt client disconnections without dangling sockets.

---

3. Verification Method Rationale & Deliverables Matrix

Verification Method	Primary Objective	Target Artifact Deliverable
API Contract & Reference Verification	Assert OpenAPI 3.1.0 schema compliance and endpoint response contracts.	verification/api/tests/api_reference_verification.py
Property-Based Testing (Hypothesis)	Verify mathematical system invariants across randomized input spaces.	verification/api/tests/test_api_hypothesis.py
Adversarial Robustness & Security	Evaluate 80+ security attack vectors (injections, auth, malformed headers).	verification/api/tests/test_api_robustness.py
Performance Benchmarking	Measure latency percentiles (p50/p95/p99), RPS throughput, and memory allocations.	verification/api/tests/benchmark_api.py
Operational & Production Audit	Evaluate health probes, RFC headers, mTLS, DDoS, and structured logging.	verification/api/tests/api_production_engineering_evaluation.md

---

This roadmap serves as the master execution plan for the complete API scientific verification suite.