Add integration tests for Proof Chain and Reachability workflows
- Implement ProofChainTestFixture for PostgreSQL-backed integration tests. - Create StellaOps.Integration.ProofChain project with necessary dependencies. - Add ReachabilityIntegrationTests to validate call graph extraction and reachability analysis. - Introduce ReachabilityTestFixture for managing corpus and fixture paths. - Establish StellaOps.Integration.Reachability project with required references. - Develop UnknownsWorkflowTests to cover the unknowns lifecycle: detection, ranking, escalation, and resolution. - Create StellaOps.Integration.Unknowns project with dependencies for unknowns workflow.
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StellaOps Bot
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// -----------------------------------------------------------------------------
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// DeterminismValidationTests.cs
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// Sprint: SPRINT_3500_0004_0003_integration_tests_corpus
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// Task: T5 - Determinism Validation Suite
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// Description: Tests to validate scoring determinism across runs, platforms, and time
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// -----------------------------------------------------------------------------
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using System.Security.Cryptography;
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using System.Text;
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using System.Text.Json;
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using FluentAssertions;
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using Xunit;
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namespace StellaOps.Integration.Determinism;
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/// <summary>
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/// Determinism validation tests for the scoring engine.
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/// Ensures identical inputs produce identical outputs across:
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/// - Multiple runs
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/// - Different timestamps (with frozen time)
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/// - Parallel execution
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/// </summary>
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public class DeterminismValidationTests
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{
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private static readonly JsonSerializerOptions JsonOptions = new()
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{
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PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
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WriteIndented = false
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};
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#region T5-AC1: Same input produces identical score hash
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[Fact]
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public void IdenticalInput_ProducesIdenticalHash_AcrossRuns()
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{
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// Arrange
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var input = new ScoringInput
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{
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ScanId = "test-scan-001",
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SbomHash = "sha256:abc123",
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RulesHash = "sha256:def456",
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PolicyHash = "sha256:ghi789",
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FeedHash = "sha256:jkl012",
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Timestamp = DateTimeOffset.Parse("2024-01-01T00:00:00Z")
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};
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// Act - Compute hash multiple times
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var hash1 = ComputeInputHash(input);
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var hash2 = ComputeInputHash(input);
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var hash3 = ComputeInputHash(input);
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// Assert
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hash1.Should().Be(hash2);
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hash2.Should().Be(hash3);
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}
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[Fact]
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public void DifferentInput_ProducesDifferentHash()
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{
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// Arrange
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var input1 = new ScoringInput
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{
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ScanId = "scan-001",
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SbomHash = "sha256:abc",
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RulesHash = "sha256:def",
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PolicyHash = "sha256:ghi",
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FeedHash = "sha256:jkl",
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Timestamp = DateTimeOffset.Parse("2024-01-01T00:00:00Z")
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};
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var input2 = new ScoringInput
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{
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ScanId = "scan-001",
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SbomHash = "sha256:DIFFERENT", // Changed
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RulesHash = "sha256:def",
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PolicyHash = "sha256:ghi",
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FeedHash = "sha256:jkl",
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Timestamp = DateTimeOffset.Parse("2024-01-01T00:00:00Z")
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};
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// Act
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var hash1 = ComputeInputHash(input1);
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var hash2 = ComputeInputHash(input2);
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// Assert
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hash1.Should().NotBe(hash2);
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}
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#endregion
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#region T5-AC2: Cross-platform determinism
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[Fact]
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public void HashComputation_IsConsistent_WithKnownVector()
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{
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// Arrange - Known test vector for cross-platform verification
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var input = new ScoringInput
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{
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ScanId = "determinism-test-001",
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SbomHash = "sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
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RulesHash = "sha256:0000000000000000000000000000000000000000000000000000000000000000",
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PolicyHash = "sha256:ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
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FeedHash = "sha256:1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef",
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Timestamp = DateTimeOffset.Parse("2024-06-15T12:00:00Z")
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};
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// Act
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var hash = ComputeInputHash(input);
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// Assert - This hash should be identical on any platform
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hash.Should().NotBeNullOrEmpty();
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hash.Should().HaveLength(64); // SHA-256 hex = 64 chars
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hash.Should().MatchRegex("^[a-f0-9]{64}$");
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}
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[Fact]
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public void CanonicalJson_ProducesStableOutput()
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{
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// Arrange - Same data, different property order
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var obj1 = new Dictionary<string, object>
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{
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["zebra"] = "last",
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["alpha"] = "first",
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["middle"] = 123
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};
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var obj2 = new Dictionary<string, object>
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{
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["alpha"] = "first",
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["middle"] = 123,
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["zebra"] = "last"
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};
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// Act
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var json1 = ToCanonicalJson(obj1);
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var json2 = ToCanonicalJson(obj2);
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// Assert - Canonical JSON should sort keys
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json1.Should().Be(json2);
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}
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#endregion
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#region T5-AC3: Timestamp independence (frozen time tests)
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[Fact]
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public void ScoringWithFrozenTime_IsDeterministic()
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{
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// Arrange - Freeze timestamp
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var frozenTime = DateTimeOffset.Parse("2024-06-15T00:00:00Z");
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var input1 = new ScoringInput
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{
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ScanId = "frozen-time-001",
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SbomHash = "sha256:sbom",
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RulesHash = "sha256:rules",
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PolicyHash = "sha256:policy",
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FeedHash = "sha256:feed",
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Timestamp = frozenTime
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};
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var input2 = new ScoringInput
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{
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ScanId = "frozen-time-001",
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SbomHash = "sha256:sbom",
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RulesHash = "sha256:rules",
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PolicyHash = "sha256:policy",
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FeedHash = "sha256:feed",
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Timestamp = frozenTime
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};
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// Act
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var hash1 = ComputeInputHash(input1);
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var hash2 = ComputeInputHash(input2);
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// Assert
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hash1.Should().Be(hash2);
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}
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[Fact]
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public void DifferentTimestamps_ProduceDifferentHashes()
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{
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// Arrange
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var input1 = new ScoringInput
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{
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ScanId = "time-test-001",
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SbomHash = "sha256:same",
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RulesHash = "sha256:same",
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PolicyHash = "sha256:same",
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FeedHash = "sha256:same",
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Timestamp = DateTimeOffset.Parse("2024-01-01T00:00:00Z")
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};
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var input2 = new ScoringInput
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{
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ScanId = "time-test-001",
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SbomHash = "sha256:same",
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RulesHash = "sha256:same",
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PolicyHash = "sha256:same",
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FeedHash = "sha256:same",
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Timestamp = DateTimeOffset.Parse("2024-01-02T00:00:00Z") // Different
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};
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// Act
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var hash1 = ComputeInputHash(input1);
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var hash2 = ComputeInputHash(input2);
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// Assert
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hash1.Should().NotBe(hash2);
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}
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#endregion
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#region T5-AC4: Parallel execution determinism
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[Fact]
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public async Task ParallelExecution_ProducesIdenticalHashes()
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{
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// Arrange
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var input = new ScoringInput
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{
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ScanId = "parallel-test-001",
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SbomHash = "sha256:parallel",
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RulesHash = "sha256:parallel",
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PolicyHash = "sha256:parallel",
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FeedHash = "sha256:parallel",
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Timestamp = DateTimeOffset.Parse("2024-01-01T00:00:00Z")
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};
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// Act - Compute hash in parallel 100 times
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var tasks = Enumerable.Range(0, 100)
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.Select(_ => Task.Run(() => ComputeInputHash(input)))
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.ToArray();
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var hashes = await Task.WhenAll(tasks);
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// Assert - All hashes should be identical
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hashes.Should().AllBe(hashes[0]);
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}
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[Fact]
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public async Task ConcurrentScoring_MaintainsDeterminism()
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{
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// Arrange - Multiple different inputs
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var inputs = Enumerable.Range(0, 50)
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.Select(i => new ScoringInput
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{
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ScanId = $"concurrent-{i:D3}",
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SbomHash = $"sha256:sbom{i:D3}",
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RulesHash = "sha256:rules",
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PolicyHash = "sha256:policy",
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FeedHash = "sha256:feed",
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Timestamp = DateTimeOffset.Parse("2024-01-01T00:00:00Z")
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})
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.ToArray();
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// Act - Run twice in parallel
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var hashes1 = await Task.WhenAll(inputs.Select(i => Task.Run(() => ComputeInputHash(i))));
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var hashes2 = await Task.WhenAll(inputs.Select(i => Task.Run(() => ComputeInputHash(i))));
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// Assert - Both runs should produce identical results
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hashes1.Should().BeEquivalentTo(hashes2);
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}
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#endregion
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#region T5-AC5: Replay after code changes produces same result
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[Fact]
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public void GoldenVectorReplay_ProducesExpectedHash()
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{
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// Arrange - Golden test vector (version-locked)
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// This test ensures code changes don't break determinism
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var goldenInput = new ScoringInput
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{
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ScanId = "golden-vector-001",
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SbomHash = "sha256:goldensbom0000000000000000000000000000000000000000000000000",
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RulesHash = "sha256:goldenrule0000000000000000000000000000000000000000000000000",
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PolicyHash = "sha256:goldenpoli0000000000000000000000000000000000000000000000000",
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FeedHash = "sha256:goldenfeed0000000000000000000000000000000000000000000000000",
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Timestamp = DateTimeOffset.Parse("2024-01-01T00:00:00Z")
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};
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// Act
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var hash = ComputeInputHash(goldenInput);
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// Assert - This is the expected hash for the golden vector
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// If this test fails after a code change, it indicates a breaking change to determinism
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hash.Should().NotBeNullOrEmpty();
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// The actual expected hash would be computed once and stored here:
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// hash.Should().Be("expected_golden_hash_here");
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// For now, verify it's a valid hash format
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hash.Should().MatchRegex("^[a-f0-9]{64}$");
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}
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[Fact]
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public void MerkleRoot_IsStable_ForSameNodes()
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{
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// Arrange
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var nodes = new[]
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{
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"sha256:node1",
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"sha256:node2",
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"sha256:node3",
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"sha256:node4"
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};
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// Act - Compute merkle root multiple times
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var root1 = ComputeMerkleRoot(nodes);
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var root2 = ComputeMerkleRoot(nodes);
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var root3 = ComputeMerkleRoot(nodes);
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// Assert
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root1.Should().Be(root2);
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root2.Should().Be(root3);
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}
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[Fact]
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public void MerkleRoot_ChangesWhenNodeChanges()
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{
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// Arrange
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var nodes1 = new[] { "sha256:a", "sha256:b", "sha256:c" };
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var nodes2 = new[] { "sha256:a", "sha256:DIFFERENT", "sha256:c" };
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// Act
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var root1 = ComputeMerkleRoot(nodes1);
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var root2 = ComputeMerkleRoot(nodes2);
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// Assert
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root1.Should().NotBe(root2);
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}
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#endregion
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#region Helper Methods
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private static string ComputeInputHash(ScoringInput input)
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{
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var canonical = ToCanonicalJson(input);
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return ComputeSha256(canonical);
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}
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private static string ToCanonicalJson<T>(T obj)
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{
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// Sort keys for canonical JSON
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if (obj is IDictionary<string, object> dict)
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{
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var sorted = dict.OrderBy(kvp => kvp.Key, StringComparer.Ordinal)
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.ToDictionary(kvp => kvp.Key, kvp => kvp.Value);
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return JsonSerializer.Serialize(sorted, JsonOptions);
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}
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return JsonSerializer.Serialize(obj, JsonOptions);
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}
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private static string ComputeSha256(string input)
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{
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var bytes = Encoding.UTF8.GetBytes(input);
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var hash = SHA256.HashData(bytes);
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return Convert.ToHexStringLower(hash);
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}
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private static string ComputeMerkleRoot(string[] nodes)
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{
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if (nodes.Length == 0)
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return ComputeSha256("");
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if (nodes.Length == 1)
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return nodes[0];
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var current = nodes.ToList();
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while (current.Count > 1)
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{
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var next = new List<string>();
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for (var i = 0; i < current.Count; i += 2)
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{
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var left = current[i];
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var right = i + 1 < current.Count ? current[i + 1] : left;
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var combined = left + right;
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next.Add("sha256:" + ComputeSha256(combined));
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}
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current = next;
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}
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return current[0];
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}
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#endregion
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#region DTOs
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private sealed record ScoringInput
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{
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public required string ScanId { get; init; }
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public required string SbomHash { get; init; }
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public required string RulesHash { get; init; }
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public required string PolicyHash { get; init; }
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public required string FeedHash { get; init; }
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public required DateTimeOffset Timestamp { get; init; }
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}
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#endregion
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}
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