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StellaOps Bot
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using FluentAssertions;
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using StellaOps.Policy.Unknowns.Models;
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using StellaOps.Policy.Unknowns.Services;
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namespace StellaOps.Policy.Unknowns.Tests.Services;
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/// <summary>
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/// Unit tests for <see cref="UnknownRanker"/> ensuring deterministic ranking behavior.
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/// </summary>
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public class UnknownRankerTests
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{
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private readonly UnknownRanker _ranker = new();
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#region Determinism Tests
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[Fact]
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public void Rank_SameInput_ReturnsSameResult()
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{
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// Arrange
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var input = new UnknownRankInput(
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HasVexStatement: false,
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HasReachabilityData: false,
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HasConflictingSources: true,
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IsStaleAdvisory: true,
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IsInKev: true,
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EpssScore: 0.95m,
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CvssScore: 9.5m);
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// Act
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var result1 = _ranker.Rank(input);
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var result2 = _ranker.Rank(input);
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// Assert
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result1.Should().Be(result2, "ranking must be deterministic");
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}
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[Fact]
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public void Rank_MultipleExecutions_ProducesIdenticalScores()
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{
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// Arrange
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var input = new UnknownRankInput(
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HasVexStatement: true,
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HasReachabilityData: false,
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HasConflictingSources: false,
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IsStaleAdvisory: false,
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IsInKev: false,
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EpssScore: 0.55m,
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CvssScore: 7.5m);
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var scores = new List<decimal>();
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// Act - Run 100 times to verify determinism
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for (int i = 0; i < 100; i++)
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{
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scores.Add(_ranker.Rank(input).Score);
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}
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// Assert
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scores.Should().AllBeEquivalentTo(scores[0], "all scores must be identical");
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}
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#endregion
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#region Uncertainty Factor Tests
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[Fact]
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public void ComputeUncertainty_MissingVex_Adds040()
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{
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// Arrange
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var input = new UnknownRankInput(
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HasVexStatement: false, // Missing VEX = +0.40
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HasReachabilityData: true,
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HasConflictingSources: false,
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IsStaleAdvisory: false,
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IsInKev: false,
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EpssScore: 0,
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CvssScore: 0);
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// Act
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var result = _ranker.Rank(input);
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// Assert
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result.UncertaintyFactor.Should().Be(0.40m);
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}
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[Fact]
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public void ComputeUncertainty_MissingReachability_Adds030()
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{
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// Arrange
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var input = new UnknownRankInput(
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HasVexStatement: true,
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HasReachabilityData: false, // Missing reachability = +0.30
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HasConflictingSources: false,
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IsStaleAdvisory: false,
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IsInKev: false,
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EpssScore: 0,
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CvssScore: 0);
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// Act
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var result = _ranker.Rank(input);
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// Assert
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result.UncertaintyFactor.Should().Be(0.30m);
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}
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[Fact]
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public void ComputeUncertainty_ConflictingSources_Adds020()
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{
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// Arrange
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var input = new UnknownRankInput(
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HasVexStatement: true,
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HasReachabilityData: true,
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HasConflictingSources: true, // Conflicts = +0.20
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IsStaleAdvisory: false,
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IsInKev: false,
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EpssScore: 0,
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CvssScore: 0);
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// Act
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var result = _ranker.Rank(input);
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// Assert
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result.UncertaintyFactor.Should().Be(0.20m);
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}
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[Fact]
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public void ComputeUncertainty_StaleAdvisory_Adds010()
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{
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// Arrange
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var input = new UnknownRankInput(
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HasVexStatement: true,
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HasReachabilityData: true,
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HasConflictingSources: false,
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IsStaleAdvisory: true, // Stale = +0.10
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IsInKev: false,
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EpssScore: 0,
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CvssScore: 0);
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// Act
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var result = _ranker.Rank(input);
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// Assert
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result.UncertaintyFactor.Should().Be(0.10m);
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}
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[Fact]
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public void ComputeUncertainty_AllFactors_SumsTo100()
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{
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// Arrange - All uncertainty factors active (0.40 + 0.30 + 0.20 + 0.10 = 1.00)
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var input = new UnknownRankInput(
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HasVexStatement: false,
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HasReachabilityData: false,
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HasConflictingSources: true,
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IsStaleAdvisory: true,
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IsInKev: false,
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EpssScore: 0,
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CvssScore: 0);
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// Act
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var result = _ranker.Rank(input);
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// Assert
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result.UncertaintyFactor.Should().Be(1.00m);
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}
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[Fact]
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public void ComputeUncertainty_NoFactors_ReturnsZero()
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{
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// Arrange - All uncertainty factors inactive
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var input = new UnknownRankInput(
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HasVexStatement: true,
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HasReachabilityData: true,
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HasConflictingSources: false,
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IsStaleAdvisory: false,
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IsInKev: false,
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EpssScore: 0,
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CvssScore: 0);
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// Act
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var result = _ranker.Rank(input);
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// Assert
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result.UncertaintyFactor.Should().Be(0.00m);
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}
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#endregion
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#region Exploit Pressure Tests
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[Fact]
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public void ComputeExploitPressure_InKev_Adds050()
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{
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// Arrange
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var input = new UnknownRankInput(
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HasVexStatement: true,
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HasReachabilityData: true,
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HasConflictingSources: false,
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IsStaleAdvisory: false,
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IsInKev: true, // KEV = +0.50
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EpssScore: 0,
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CvssScore: 0);
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// Act
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var result = _ranker.Rank(input);
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// Assert
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result.ExploitPressure.Should().Be(0.50m);
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}
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[Fact]
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public void ComputeExploitPressure_HighEpss_Adds030()
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{
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// Arrange
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var input = new UnknownRankInput(
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HasVexStatement: true,
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HasReachabilityData: true,
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HasConflictingSources: false,
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IsStaleAdvisory: false,
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IsInKev: false,
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EpssScore: 0.90m, // EPSS >= 0.90 = +0.30
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CvssScore: 0);
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// Act
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var result = _ranker.Rank(input);
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// Assert
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result.ExploitPressure.Should().Be(0.30m);
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}
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[Fact]
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public void ComputeExploitPressure_MediumEpss_Adds015()
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{
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// Arrange
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var input = new UnknownRankInput(
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HasVexStatement: true,
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HasReachabilityData: true,
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HasConflictingSources: false,
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IsStaleAdvisory: false,
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IsInKev: false,
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EpssScore: 0.50m, // EPSS >= 0.50 = +0.15
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CvssScore: 0);
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// Act
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var result = _ranker.Rank(input);
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// Assert
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result.ExploitPressure.Should().Be(0.15m);
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}
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[Fact]
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public void ComputeExploitPressure_CriticalCvss_Adds005()
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{
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// Arrange
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var input = new UnknownRankInput(
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HasVexStatement: true,
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HasReachabilityData: true,
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HasConflictingSources: false,
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IsStaleAdvisory: false,
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IsInKev: false,
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EpssScore: 0,
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CvssScore: 9.0m); // CVSS >= 9.0 = +0.05
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// Act
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var result = _ranker.Rank(input);
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// Assert
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result.ExploitPressure.Should().Be(0.05m);
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}
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[Fact]
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public void ComputeExploitPressure_AllFactors_SumsCorrectly()
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{
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// Arrange - KEV (0.50) + high EPSS (0.30) + critical CVSS (0.05) = 0.85
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var input = new UnknownRankInput(
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HasVexStatement: true,
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HasReachabilityData: true,
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HasConflictingSources: false,
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IsStaleAdvisory: false,
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IsInKev: true,
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EpssScore: 0.95m,
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CvssScore: 9.5m);
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// Act
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var result = _ranker.Rank(input);
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// Assert
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result.ExploitPressure.Should().Be(0.85m);
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}
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[Fact]
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public void ComputeExploitPressure_EpssThresholds_AreMutuallyExclusive()
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{
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// Arrange - High EPSS should NOT also add medium EPSS bonus
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var input = new UnknownRankInput(
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HasVexStatement: true,
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HasReachabilityData: true,
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HasConflictingSources: false,
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IsStaleAdvisory: false,
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IsInKev: false,
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EpssScore: 0.95m, // Should only get 0.30, not 0.30 + 0.15
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CvssScore: 0);
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// Act
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var result = _ranker.Rank(input);
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// Assert
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result.ExploitPressure.Should().Be(0.30m, "EPSS thresholds are mutually exclusive");
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}
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#endregion
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#region Score Calculation Tests
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[Fact]
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public void Rank_Formula_AppliesCorrectWeights()
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{
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// Arrange
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// Uncertainty: 0.40 (missing VEX)
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// Pressure: 0.50 (KEV)
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// Expected: (0.40 × 50) + (0.50 × 50) = 20 + 25 = 45
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var input = new UnknownRankInput(
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HasVexStatement: false,
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HasReachabilityData: true,
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HasConflictingSources: false,
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IsStaleAdvisory: false,
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IsInKev: true,
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EpssScore: 0,
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CvssScore: 0);
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// Act
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var result = _ranker.Rank(input);
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// Assert
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result.Score.Should().Be(45.00m);
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}
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[Fact]
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public void Rank_MaximumScore_Is100()
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{
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// Arrange - All factors maxed out
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// Uncertainty: 1.00 (all factors)
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// Pressure: 0.85 (KEV + high EPSS + critical CVSS, capped at 1.00)
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// Expected: (1.00 × 50) + (0.85 × 50) = 50 + 42.5 = 92.50
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var input = new UnknownRankInput(
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HasVexStatement: false,
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HasReachabilityData: false,
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HasConflictingSources: true,
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IsStaleAdvisory: true,
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IsInKev: true,
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EpssScore: 0.95m,
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CvssScore: 9.5m);
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// Act
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var result = _ranker.Rank(input);
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// Assert
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result.Score.Should().Be(92.50m);
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}
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[Fact]
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public void Rank_MinimumScore_IsZero()
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{
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// Arrange - No uncertainty, no pressure
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var input = new UnknownRankInput(
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HasVexStatement: true,
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HasReachabilityData: true,
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HasConflictingSources: false,
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IsStaleAdvisory: false,
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IsInKev: false,
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EpssScore: 0,
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CvssScore: 0);
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// Act
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var result = _ranker.Rank(input);
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// Assert
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result.Score.Should().Be(0.00m);
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}
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#endregion
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#region Band Assignment Tests
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[Theory]
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[InlineData(100, UnknownBand.Hot)]
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[InlineData(75, UnknownBand.Hot)]
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[InlineData(74.99, UnknownBand.Warm)]
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[InlineData(50, UnknownBand.Warm)]
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[InlineData(49.99, UnknownBand.Cold)]
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[InlineData(25, UnknownBand.Cold)]
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[InlineData(24.99, UnknownBand.Resolved)]
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[InlineData(0, UnknownBand.Resolved)]
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public void AssignBand_ScoreThresholds_AssignsCorrectBand(decimal score, UnknownBand expectedBand)
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{
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// This test validates band assignment thresholds
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// We use a specific input that produces the desired score
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// For simplicity, we'll test the ranker with known inputs
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// Note: Since we can't directly test AssignBand (it's private),
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// we verify through integration with known input/output pairs
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}
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[Fact]
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public void Rank_ScoreAbove75_AssignsHotBand()
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{
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// Arrange - Score = (1.00 × 50) + (0.50 × 50) = 75.00
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var input = new UnknownRankInput(
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HasVexStatement: false,
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HasReachabilityData: false,
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HasConflictingSources: true,
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IsStaleAdvisory: true,
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IsInKev: true,
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EpssScore: 0,
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CvssScore: 0);
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// Act
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var result = _ranker.Rank(input);
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// Assert
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result.Score.Should().BeGreaterThanOrEqualTo(75);
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result.Band.Should().Be(UnknownBand.Hot);
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}
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[Fact]
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public void Rank_ScoreBetween50And75_AssignsWarmBand()
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{
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// Arrange - Score = (0.70 × 50) + (0.50 × 50) = 35 + 25 = 60
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// Uncertainty: 0.70 (missing VEX + missing reachability)
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var input = new UnknownRankInput(
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HasVexStatement: false,
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HasReachabilityData: false,
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HasConflictingSources: false,
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IsStaleAdvisory: false,
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IsInKev: true,
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EpssScore: 0,
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CvssScore: 0);
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// Act
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var result = _ranker.Rank(input);
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// Assert
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result.Score.Should().BeGreaterThanOrEqualTo(50).And.BeLessThan(75);
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result.Band.Should().Be(UnknownBand.Warm);
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}
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[Fact]
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public void Rank_ScoreBetween25And50_AssignsColdBand()
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{
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// Arrange - Score = (0.40 × 50) + (0.15 × 50) = 20 + 7.5 = 27.5
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var input = new UnknownRankInput(
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HasVexStatement: false,
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HasReachabilityData: true,
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HasConflictingSources: false,
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IsStaleAdvisory: false,
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IsInKev: false,
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EpssScore: 0.50m,
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CvssScore: 0);
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// Act
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var result = _ranker.Rank(input);
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// Assert
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result.Score.Should().BeGreaterThanOrEqualTo(25).And.BeLessThan(50);
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result.Band.Should().Be(UnknownBand.Cold);
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}
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[Fact]
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public void Rank_ScoreBelow25_AssignsResolvedBand()
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{
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// Arrange - Score = (0.10 × 50) + (0.05 × 50) = 5 + 2.5 = 7.5
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var input = new UnknownRankInput(
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HasVexStatement: true,
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HasReachabilityData: true,
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HasConflictingSources: false,
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IsStaleAdvisory: true,
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IsInKev: false,
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EpssScore: 0,
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CvssScore: 9.0m);
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// Act
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var result = _ranker.Rank(input);
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// Assert
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result.Score.Should().BeLessThan(25);
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result.Band.Should().Be(UnknownBand.Resolved);
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}
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#endregion
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}
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