Determinism Gate Testing Infrastructure

Module

__Libraries

IMPLEMENTED

Dedicated determinism testing library and TestKit deterministic helpers for CI-gated canonical output verification.

TestKit: src/__Libraries/StellaOps.TestKit/ -- comprehensive shared test kit with TestCategories, DeterministicRandom, DeterministicTime, CanonicalJsonAssert, SnapshotAssert, BlastRadiusTestRunner/Validator, ConnectorTestBase hierarchy (HttpFixture, LiveSchema, Resilience, Security), FixtureUpdater, EnvironmentProfile, SkewTestRunner, EvidenceChainAssert/Reporter, IntentAttribute/TestIntents, SchemaVersionMatrix, StabilityMetrics/TestRunner, OTelContractAssert, LogContractAssert, MetricsContractAssert, CacheIdempotencyTests, FlakyToDeterministicPattern, QueryDeterminismTests, StorageConcurrencyTests/IdempotencyTests, WebServiceTestBase
Testing.Determinism: src/__Libraries/StellaOps.Testing.Determinism/ -- determinism-specific test infrastructure (referenced but directory may be integrated into TestKit)
Determinism.Abstractions: src/__Libraries/StellaOps.Determinism.Abstractions/ -- IGuidProvider (SystemGuidProvider/SequentialGuidProvider), ResolverBoundaryAttribute, RequiresCanonicalizationAttribute, DeterministicOutputAttribute, DeterminismServiceCollectionExtensions (AddSystemTimeProvider, AddSystemGuidProvider, AddDeterminismDefaults)
Source: Feature matrix scan

Verify CanonicalJsonAssert detects non-deterministic JSON serialization (e.g., unordered keys)
Verify SnapshotAssert compares golden snapshots and reports diffs
Test DeterministicRandom produces repeatable sequences with same seed
Test DeterministicTime provides controlled time progression
Verify SequentialGuidProvider returns predictable GUID sequence with counter in last 4 bytes
Test BlastRadiusTestRunner validates change scope within expected boundaries
Verify StorageIdempotencyTests confirm repeated writes produce identical results
Test FlakyToDeterministicPattern converts non-deterministic tests to deterministic equivalents