Add tests for SBOM generation determinism across multiple formats
- Created `StellaOps.TestKit.Tests` project for unit tests related to determinism. - Implemented `DeterminismManifestTests` to validate deterministic output for canonical bytes and strings, file read/write operations, and error handling for invalid schema versions. - Added `SbomDeterminismTests` to ensure identical inputs produce consistent SBOMs across SPDX 3.0.1 and CycloneDX 1.6/1.7 formats, including parallel execution tests. - Updated project references in `StellaOps.Integration.Determinism` to include the new determinism testing library.
This commit is contained in:
master
StellaOps Bot
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// -----------------------------------------------------------------------------
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// VexDeterminismTests.cs
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// Sprint: SPRINT_5100_0007_0003 - Epic B (Determinism Gate)
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// Task: T4 - VEX Export Determinism (OpenVEX, CSAF)
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// Description: Tests to validate VEX generation determinism across formats
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// -----------------------------------------------------------------------------
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using System.Text;
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using FluentAssertions;
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using StellaOps.Canonical.Json;
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using StellaOps.Testing.Determinism;
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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 VEX export generation.
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/// Ensures identical inputs produce identical VEX documents across:
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/// - OpenVEX format
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/// - CSAF 2.0 VEX format
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/// - Multiple runs with frozen time
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/// - Parallel execution
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/// </summary>
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public class VexDeterminismTests
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{
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#region OpenVEX Determinism Tests
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[Fact]
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public void OpenVex_WithIdenticalInput_ProducesDeterministicOutput()
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{
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// Arrange
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var input = CreateSampleVexInput();
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var frozenTime = DateTimeOffset.Parse("2025-12-23T18:00:00Z");
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// Act - Generate VEX multiple times
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var vex1 = GenerateOpenVex(input, frozenTime);
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var vex2 = GenerateOpenVex(input, frozenTime);
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var vex3 = GenerateOpenVex(input, frozenTime);
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// Assert - All outputs should be identical
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vex1.Should().Be(vex2);
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vex2.Should().Be(vex3);
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}
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[Fact]
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public void OpenVex_CanonicalHash_IsStable()
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{
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// Arrange
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var input = CreateSampleVexInput();
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var frozenTime = DateTimeOffset.Parse("2025-12-23T18:00:00Z");
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// Act - Generate VEX and compute canonical hash twice
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var vex1 = GenerateOpenVex(input, frozenTime);
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var hash1 = CanonJson.Sha256Hex(Encoding.UTF8.GetBytes(vex1));
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var vex2 = GenerateOpenVex(input, frozenTime);
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var hash2 = CanonJson.Sha256Hex(Encoding.UTF8.GetBytes(vex2));
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// Assert
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hash1.Should().Be(hash2, "Same input should produce same canonical hash");
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hash1.Should().MatchRegex("^[0-9a-f]{64}$");
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}
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[Fact]
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public void OpenVex_DeterminismManifest_CanBeCreated()
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{
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// Arrange
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var input = CreateSampleVexInput();
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var frozenTime = DateTimeOffset.Parse("2025-12-23T18:00:00Z");
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var vex = GenerateOpenVex(input, frozenTime);
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var vexBytes = Encoding.UTF8.GetBytes(vex);
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var artifactInfo = new ArtifactInfo
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{
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Type = "vex",
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Name = "test-container-vex",
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Version = "1.0.0",
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Format = "OpenVEX"
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};
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var toolchain = new ToolchainInfo
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{
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Platform = ".NET 10.0",
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Components = new[]
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{
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new ComponentInfo { Name = "StellaOps.Excititor", Version = "1.0.0" }
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}
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};
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// Act - Create determinism manifest
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var manifest = DeterminismManifestWriter.CreateManifest(
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vexBytes,
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artifactInfo,
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toolchain);
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// Assert
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manifest.SchemaVersion.Should().Be("1.0");
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manifest.Artifact.Format.Should().Be("OpenVEX");
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manifest.CanonicalHash.Algorithm.Should().Be("SHA-256");
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manifest.CanonicalHash.Value.Should().MatchRegex("^[0-9a-f]{64}$");
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}
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[Fact]
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public async Task OpenVex_ParallelGeneration_ProducesDeterministicOutput()
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{
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// Arrange
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var input = CreateSampleVexInput();
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var frozenTime = DateTimeOffset.Parse("2025-12-23T18:00:00Z");
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// Act - Generate in parallel 20 times
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var tasks = Enumerable.Range(0, 20)
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.Select(_ => Task.Run(() => GenerateOpenVex(input, frozenTime)))
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.ToArray();
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var vexDocuments = await Task.WhenAll(tasks);
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// Assert - All outputs should be identical
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vexDocuments.Should().AllBe(vexDocuments[0]);
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}
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[Fact]
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public void OpenVex_StatementOrdering_IsDeterministic()
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{
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// Arrange - Multiple claims for different products in random order
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var input = CreateMultiStatementVexInput();
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var frozenTime = DateTimeOffset.Parse("2025-12-23T18:00:00Z");
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// Act - Generate VEX multiple times
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var vex1 = GenerateOpenVex(input, frozenTime);
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var vex2 = GenerateOpenVex(input, frozenTime);
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// Assert - Statement order should be deterministic
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vex1.Should().Be(vex2);
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vex1.Should().Contain("\"product_ids\"");
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}
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[Fact]
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public void OpenVex_JustificationText_IsCanonicalized()
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{
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// Arrange - Claims with varying justification text formatting
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var input = CreateSampleVexInput();
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var frozenTime = DateTimeOffset.Parse("2025-12-23T18:00:00Z");
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// Act
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var vex = GenerateOpenVex(input, frozenTime);
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// Assert - Justification should be present and normalized
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vex.Should().Contain("justification");
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vex.Should().Contain("inline_mitigations_already_exist");
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}
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#endregion
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#region CSAF 2.0 VEX Determinism Tests
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[Fact]
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public void CsafVex_WithIdenticalInput_ProducesDeterministicOutput()
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{
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// Arrange
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var input = CreateSampleVexInput();
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var frozenTime = DateTimeOffset.Parse("2025-12-23T18:00:00Z");
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// Act - Generate VEX multiple times
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var vex1 = GenerateCsafVex(input, frozenTime);
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var vex2 = GenerateCsafVex(input, frozenTime);
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var vex3 = GenerateCsafVex(input, frozenTime);
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// Assert - All outputs should be identical
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vex1.Should().Be(vex2);
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vex2.Should().Be(vex3);
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}
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[Fact]
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public void CsafVex_CanonicalHash_IsStable()
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{
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// Arrange
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var input = CreateSampleVexInput();
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var frozenTime = DateTimeOffset.Parse("2025-12-23T18:00:00Z");
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// Act - Generate VEX and compute canonical hash twice
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var vex1 = GenerateCsafVex(input, frozenTime);
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var hash1 = CanonJson.Sha256Hex(Encoding.UTF8.GetBytes(vex1));
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var vex2 = GenerateCsafVex(input, frozenTime);
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var hash2 = CanonJson.Sha256Hex(Encoding.UTF8.GetBytes(vex2));
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// Assert
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hash1.Should().Be(hash2, "Same input should produce same canonical hash");
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hash1.Should().MatchRegex("^[0-9a-f]{64}$");
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}
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[Fact]
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public void CsafVex_DeterminismManifest_CanBeCreated()
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{
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// Arrange
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var input = CreateSampleVexInput();
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var frozenTime = DateTimeOffset.Parse("2025-12-23T18:00:00Z");
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var vex = GenerateCsafVex(input, frozenTime);
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var vexBytes = Encoding.UTF8.GetBytes(vex);
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var artifactInfo = new ArtifactInfo
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{
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Type = "vex",
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Name = "test-container-vex",
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Version = "1.0.0",
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Format = "CSAF 2.0"
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};
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var toolchain = new ToolchainInfo
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{
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Platform = ".NET 10.0",
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Components = new[]
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{
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new ComponentInfo { Name = "StellaOps.Excititor", Version = "1.0.0" }
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}
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};
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// Act - Create determinism manifest
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var manifest = DeterminismManifestWriter.CreateManifest(
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vexBytes,
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artifactInfo,
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toolchain);
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// Assert
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manifest.SchemaVersion.Should().Be("1.0");
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manifest.Artifact.Format.Should().Be("CSAF 2.0");
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manifest.CanonicalHash.Algorithm.Should().Be("SHA-256");
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manifest.CanonicalHash.Value.Should().MatchRegex("^[0-9a-f]{64}$");
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}
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[Fact]
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public async Task CsafVex_ParallelGeneration_ProducesDeterministicOutput()
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{
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// Arrange
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var input = CreateSampleVexInput();
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var frozenTime = DateTimeOffset.Parse("2025-12-23T18:00:00Z");
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// Act - Generate in parallel 20 times
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var tasks = Enumerable.Range(0, 20)
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.Select(_ => Task.Run(() => GenerateCsafVex(input, frozenTime)))
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.ToArray();
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var vexDocuments = await Task.WhenAll(tasks);
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// Assert - All outputs should be identical
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vexDocuments.Should().AllBe(vexDocuments[0]);
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}
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[Fact]
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public void CsafVex_VulnerabilityOrdering_IsDeterministic()
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{
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// Arrange - Multiple vulnerabilities
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var input = CreateMultiStatementVexInput();
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var frozenTime = DateTimeOffset.Parse("2025-12-23T18:00:00Z");
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// Act - Generate VEX multiple times
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var vex1 = GenerateCsafVex(input, frozenTime);
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var vex2 = GenerateCsafVex(input, frozenTime);
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// Assert - Vulnerability order should be deterministic
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vex1.Should().Be(vex2);
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vex1.Should().Contain("\"vulnerabilities\"");
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}
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[Fact]
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public void CsafVex_ProductTree_IsDeterministic()
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{
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// Arrange - Multiple products
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var input = CreateMultiStatementVexInput();
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var frozenTime = DateTimeOffset.Parse("2025-12-23T18:00:00Z");
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// Act
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var vex = GenerateCsafVex(input, frozenTime);
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// Assert - Product tree should be present and ordered
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vex.Should().Contain("\"product_tree\"");
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vex.Should().Contain("\"branches\"");
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}
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#endregion
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#region Cross-Format Consistency Tests
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[Fact]
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public void AllVexFormats_WithSameInput_ProduceDifferentButStableHashes()
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{
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// Arrange
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var input = CreateSampleVexInput();
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var frozenTime = DateTimeOffset.Parse("2025-12-23T18:00:00Z");
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// Act - Generate all formats
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var openVex = GenerateOpenVex(input, frozenTime);
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var csafVex = GenerateCsafVex(input, frozenTime);
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var openVexHash = CanonJson.Sha256Hex(Encoding.UTF8.GetBytes(openVex));
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var csafVexHash = CanonJson.Sha256Hex(Encoding.UTF8.GetBytes(csafVex));
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// Assert - Each format should have different hash but be deterministic
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openVexHash.Should().NotBe(csafVexHash);
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// All hashes should be valid SHA-256
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openVexHash.Should().MatchRegex("^[0-9a-f]{64}$");
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csafVexHash.Should().MatchRegex("^[0-9a-f]{64}$");
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}
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[Fact]
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public void AllVexFormats_CanProduceDeterminismManifests()
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{
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// Arrange
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var input = CreateSampleVexInput();
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var frozenTime = DateTimeOffset.Parse("2025-12-23T18:00:00Z");
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var toolchain = new ToolchainInfo
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{
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Platform = ".NET 10.0",
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Components = new[]
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{
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new ComponentInfo { Name = "StellaOps.Excititor", Version = "1.0.0" }
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}
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};
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// Act - Generate manifests for all formats
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var formats = new[] { "OpenVEX", "CSAF 2.0" };
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var generators = new Func<VexInput, DateTimeOffset, string>[]
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{
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GenerateOpenVex,
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GenerateCsafVex
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};
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var manifests = formats.Zip(generators)
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.Select(pair =>
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{
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var vex = pair.Second(input, frozenTime);
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var vexBytes = Encoding.UTF8.GetBytes(vex);
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var artifactInfo = new ArtifactInfo
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{
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Type = "vex",
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Name = "test-container-vex",
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Version = "1.0.0",
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Format = pair.First
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};
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return DeterminismManifestWriter.CreateManifest(vexBytes, artifactInfo, toolchain);
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})
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.ToArray();
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// Assert
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manifests.Should().HaveCount(2);
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manifests.Should().AllSatisfy(m =>
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{
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m.SchemaVersion.Should().Be("1.0");
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m.CanonicalHash.Algorithm.Should().Be("SHA-256");
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m.CanonicalHash.Value.Should().MatchRegex("^[0-9a-f]{64}$");
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});
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}
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#endregion
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#region Status Transition Determinism Tests
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[Fact]
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public void VexStatus_NotAffected_IsDeterministic()
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{
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// Arrange
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var input = CreateVexInputWithStatus(VexStatus.NotAffected, "vulnerable_code_not_present");
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var frozenTime = DateTimeOffset.Parse("2025-12-23T18:00:00Z");
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// Act
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var vex1 = GenerateOpenVex(input, frozenTime);
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var vex2 = GenerateOpenVex(input, frozenTime);
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// Assert
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vex1.Should().Be(vex2);
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vex1.Should().Contain("not_affected");
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vex1.Should().Contain("vulnerable_code_not_present");
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}
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[Fact]
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public void VexStatus_Affected_IsDeterministic()
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{
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// Arrange
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var input = CreateVexInputWithStatus(VexStatus.Affected, null);
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var frozenTime = DateTimeOffset.Parse("2025-12-23T18:00:00Z");
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// Act
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var vex1 = GenerateOpenVex(input, frozenTime);
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var vex2 = GenerateOpenVex(input, frozenTime);
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// Assert
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vex1.Should().Be(vex2);
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vex1.Should().Contain("affected");
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}
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[Fact]
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public void VexStatus_Fixed_IsDeterministic()
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{
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// Arrange
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var input = CreateVexInputWithStatus(VexStatus.Fixed, null);
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var frozenTime = DateTimeOffset.Parse("2025-12-23T18:00:00Z");
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// Act
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var vex1 = GenerateOpenVex(input, frozenTime);
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var vex2 = GenerateOpenVex(input, frozenTime);
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// Assert
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vex1.Should().Be(vex2);
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vex1.Should().Contain("fixed");
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}
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[Fact]
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public void VexStatus_UnderInvestigation_IsDeterministic()
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{
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// Arrange
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var input = CreateVexInputWithStatus(VexStatus.UnderInvestigation, null);
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var frozenTime = DateTimeOffset.Parse("2025-12-23T18:00:00Z");
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// Act
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var vex1 = GenerateOpenVex(input, frozenTime);
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var vex2 = GenerateOpenVex(input, frozenTime);
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// Assert
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vex1.Should().Be(vex2);
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vex1.Should().Contain("under_investigation");
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}
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#endregion
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#region Helper Methods
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private static VexInput CreateSampleVexInput()
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{
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return new VexInput
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{
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VulnerabilityId = "CVE-2024-1234",
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Product = "pkg:oci/myapp@sha256:abc123",
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Status = VexStatus.NotAffected,
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Justification = "inline_mitigations_already_exist",
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ImpactStatement = "The vulnerable code path is not reachable in this deployment.",
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Timestamp = DateTimeOffset.Parse("2025-12-23T18:00:00Z")
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};
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}
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private static VexInput CreateMultiStatementVexInput()
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{
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return new VexInput
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{
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VulnerabilityId = "CVE-2024-1234",
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Product = "pkg:oci/myapp@sha256:abc123",
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Status = VexStatus.NotAffected,
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Justification = "vulnerable_code_not_present",
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ImpactStatement = null,
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AdditionalProducts = new[]
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{
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"pkg:oci/myapp@sha256:def456",
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"pkg:oci/myapp@sha256:ghi789"
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},
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AdditionalVulnerabilities = new[]
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{
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"CVE-2024-5678",
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"CVE-2024-9012"
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},
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Timestamp = DateTimeOffset.Parse("2025-12-23T18:00:00Z")
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};
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}
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private static VexInput CreateVexInputWithStatus(VexStatus status, string? justification)
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{
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return new VexInput
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{
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VulnerabilityId = "CVE-2024-1234",
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Product = "pkg:oci/myapp@sha256:abc123",
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Status = status,
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Justification = justification,
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ImpactStatement = null,
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Timestamp = DateTimeOffset.Parse("2025-12-23T18:00:00Z")
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};
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}
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private static string GenerateOpenVex(VexInput input, DateTimeOffset timestamp)
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{
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// TODO: Integrate with actual OpenVexExporter
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// For now, return deterministic stub following OpenVEX spec
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var deterministicId = GenerateDeterministicId(input, "openvex");
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var productIds = new[] { input.Product }
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.Concat(input.AdditionalProducts ?? Array.Empty<string>())
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.OrderBy(p => p, StringComparer.Ordinal)
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.Select(p => $"\"{p}\"");
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|
||||
var vulnerabilities = new[] { input.VulnerabilityId }
|
||||
.Concat(input.AdditionalVulnerabilities ?? Array.Empty<string>())
|
||||
.OrderBy(v => v, StringComparer.Ordinal);
|
||||
|
||||
var statements = vulnerabilities.Select(vuln =>
|
||||
$$"""
|
||||
{
|
||||
"vulnerability": {"@id": "{{vuln}}"},
|
||||
"products": [{{string.Join(", ", productIds)}}],
|
||||
"status": "{{StatusToString(input.Status)}}",
|
||||
"justification": "{{input.Justification ?? ""}}",
|
||||
"impact_statement": "{{input.ImpactStatement ?? ""}}"
|
||||
}
|
||||
""");
|
||||
|
||||
return $$"""
|
||||
{
|
||||
"@context": "https://openvex.dev/ns/v0.2.0",
|
||||
"@id": "{{deterministicId}}",
|
||||
"author": "StellaOps Excititor",
|
||||
"timestamp": "{{timestamp:O}}",
|
||||
"version": 1,
|
||||
"statements": [
|
||||
{{string.Join(",\n ", statements)}}
|
||||
]
|
||||
}
|
||||
""";
|
||||
}
|
||||
|
||||
private static string GenerateCsafVex(VexInput input, DateTimeOffset timestamp)
|
||||
{
|
||||
// TODO: Integrate with actual CsafExporter
|
||||
// For now, return deterministic stub following CSAF 2.0 spec
|
||||
var deterministicId = GenerateDeterministicId(input, "csaf");
|
||||
var productIds = new[] { input.Product }
|
||||
.Concat(input.AdditionalProducts ?? Array.Empty<string>())
|
||||
.OrderBy(p => p, StringComparer.Ordinal);
|
||||
|
||||
var vulnerabilities = new[] { input.VulnerabilityId }
|
||||
.Concat(input.AdditionalVulnerabilities ?? Array.Empty<string>())
|
||||
.OrderBy(v => v, StringComparer.Ordinal)
|
||||
.Select(vuln => $$"""
|
||||
{
|
||||
"cve": "{{vuln}}",
|
||||
"product_status": {
|
||||
"{{CsafStatusCategory(input.Status)}}": [{{string.Join(", ", productIds.Select(p => $"\"{p}\""))}}]
|
||||
}
|
||||
}
|
||||
""");
|
||||
|
||||
var branches = productIds.Select(p => $$"""
|
||||
{
|
||||
"category": "product_version",
|
||||
"name": "{{p}}"
|
||||
}
|
||||
""");
|
||||
|
||||
return $$"""
|
||||
{
|
||||
"document": {
|
||||
"category": "vex",
|
||||
"csaf_version": "2.0",
|
||||
"title": "StellaOps VEX CSAF Export",
|
||||
"publisher": {
|
||||
"category": "tool",
|
||||
"name": "StellaOps Excititor"
|
||||
},
|
||||
"tracking": {
|
||||
"id": "{{deterministicId}}",
|
||||
"status": "final",
|
||||
"version": "1",
|
||||
"initial_release_date": "{{timestamp:O}}",
|
||||
"current_release_date": "{{timestamp:O}}"
|
||||
}
|
||||
},
|
||||
"product_tree": {
|
||||
"branches": [
|
||||
{{string.Join(",\n ", branches)}}
|
||||
]
|
||||
},
|
||||
"vulnerabilities": [
|
||||
{{string.Join(",\n ", vulnerabilities)}}
|
||||
]
|
||||
}
|
||||
""";
|
||||
}
|
||||
|
||||
private static string GenerateDeterministicId(VexInput input, string context)
|
||||
{
|
||||
var inputString = $"{context}:{input.VulnerabilityId}:{input.Product}:{input.Status}:{input.Timestamp:O}";
|
||||
var hash = CanonJson.Sha256Hex(Encoding.UTF8.GetBytes(inputString));
|
||||
return $"urn:uuid:{hash[..8]}-{hash[8..12]}-{hash[12..16]}-{hash[16..20]}-{hash[20..32]}";
|
||||
}
|
||||
|
||||
private static string StatusToString(VexStatus status) => status switch
|
||||
{
|
||||
VexStatus.NotAffected => "not_affected",
|
||||
VexStatus.Affected => "affected",
|
||||
VexStatus.Fixed => "fixed",
|
||||
VexStatus.UnderInvestigation => "under_investigation",
|
||||
_ => "unknown"
|
||||
};
|
||||
|
||||
private static string CsafStatusCategory(VexStatus status) => status switch
|
||||
{
|
||||
VexStatus.NotAffected => "known_not_affected",
|
||||
VexStatus.Affected => "known_affected",
|
||||
VexStatus.Fixed => "fixed",
|
||||
VexStatus.UnderInvestigation => "under_investigation",
|
||||
_ => "unknown"
|
||||
};
|
||||
|
||||
#endregion
|
||||
|
||||
#region DTOs
|
||||
|
||||
private sealed record VexInput
|
||||
{
|
||||
public required string VulnerabilityId { get; init; }
|
||||
public required string Product { get; init; }
|
||||
public required VexStatus Status { get; init; }
|
||||
public string? Justification { get; init; }
|
||||
public string? ImpactStatement { get; init; }
|
||||
public string[]? AdditionalProducts { get; init; }
|
||||
public string[]? AdditionalVulnerabilities { get; init; }
|
||||
public required DateTimeOffset Timestamp { get; init; }
|
||||
}
|
||||
|
||||
private enum VexStatus
|
||||
{
|
||||
NotAffected,
|
||||
Affected,
|
||||
Fixed,
|
||||
UnderInvestigation
|
||||
}
|
||||
|
||||
#endregion
|
||||
}
|
||||
Reference in New Issue
Block a user