Add comprehensive security tests for OWASP A02, A05, A07, and A08 categories

- Implemented tests for Cryptographic Failures (A02) to ensure proper handling of sensitive data, secure algorithms, and key management.
- Added tests for Security Misconfiguration (A05) to validate production configurations, security headers, CORS settings, and feature management.
- Developed tests for Authentication Failures (A07) to enforce strong password policies, rate limiting, session management, and MFA support.
- Created tests for Software and Data Integrity Failures (A08) to verify artifact signatures, SBOM integrity, attestation chains, and feed updates.

src/Cli/__Tests/StellaOps.Cli.Tests/Commands/ProofCommandTests.cs

@@ -0,0 +1,278 @@
+// -----------------------------------------------------------------------------
+// ProofCommandTests.cs
+// Sprint: SPRINT_0501_0007_0001_proof_chain_cli_integration
+// Tasks: #10, #11, #12
+// Description: Unit tests for proof chain CLI commands
+// -----------------------------------------------------------------------------
+
+using System.CommandLine;
+using System.CommandLine.IO;
+using System.CommandLine.Parsing;
+using Microsoft.Extensions.Logging;
+using Moq;
+using Xunit;
+
+namespace StellaOps.Cli.Tests.Commands;
+
+/// <summary>
+/// Unit tests for proof chain CLI commands.
+/// </summary>
+public class ProofCommandTests
+{
+    private readonly Mock<ILogger<Proof.ProofCommandGroup>> _loggerMock;
+    private readonly Proof.ProofCommandGroup _commandGroup;
+
+    public ProofCommandTests()
+    {
+        _loggerMock = new Mock<ILogger<Proof.ProofCommandGroup>>();
+        _commandGroup = new Proof.ProofCommandGroup(_loggerMock.Object);
+    }
+
+    #region Task #10: Unit Tests for Commands
+
+    [Fact]
+    public void BuildCommand_CreatesProofCommandTree()
+    {
+        // Act
+        var command = _commandGroup.BuildCommand();
+
+        // Assert
+        Assert.Equal("proof", command.Name);
+        Assert.Equal("Proof chain operations", command.Description);
+    }
+
+    [Fact]
+    public void BuildCommand_HasVerifySubcommand()
+    {
+        // Act
+        var command = _commandGroup.BuildCommand();
+        var verifyCommand = command.Subcommands.FirstOrDefault(c => c.Name == "verify");
+
+        // Assert
+        Assert.NotNull(verifyCommand);
+        Assert.Equal("Verify an artifact's proof chain", verifyCommand.Description);
+    }
+
+    [Fact]
+    public void BuildCommand_HasSpineSubcommand()
+    {
+        // Act
+        var command = _commandGroup.BuildCommand();
+        var spineCommand = command.Subcommands.FirstOrDefault(c => c.Name == "spine");
+
+        // Assert
+        Assert.NotNull(spineCommand);
+    }
+
+    [Fact]
+    public void VerifyCommand_HasRequiredArtifactArgument()
+    {
+        // Arrange
+        var command = _commandGroup.BuildCommand();
+        var verifyCommand = command.Subcommands.First(c => c.Name == "verify");
+
+        // Act
+        var artifactArg = verifyCommand.Arguments.FirstOrDefault(a => a.Name == "artifact");
+
+        // Assert
+        Assert.NotNull(artifactArg);
+    }
+
+    [Fact]
+    public void VerifyCommand_HasSbomOption()
+    {
+        // Arrange
+        var command = _commandGroup.BuildCommand();
+        var verifyCommand = command.Subcommands.First(c => c.Name == "verify");
+
+        // Act
+        var sbomOption = verifyCommand.Options.FirstOrDefault(o =>
+            o.Aliases.Contains("-s") || o.Aliases.Contains("--sbom"));
+
+        // Assert
+        Assert.NotNull(sbomOption);
+    }
+
+    [Fact]
+    public void VerifyCommand_HasOfflineOption()
+    {
+        // Arrange
+        var command = _commandGroup.BuildCommand();
+        var verifyCommand = command.Subcommands.First(c => c.Name == "verify");
+
+        // Act
+        var offlineOption = verifyCommand.Options.FirstOrDefault(o =>
+            o.Name == "--offline" || o.Aliases.Contains("--offline"));
+
+        // Assert
+        Assert.NotNull(offlineOption);
+    }
+
+    [Fact]
+    public void VerifyCommand_HasOutputFormatOption()
+    {
+        // Arrange
+        var command = _commandGroup.BuildCommand();
+        var verifyCommand = command.Subcommands.First(c => c.Name == "verify");
+
+        // Act
+        var outputOption = verifyCommand.Options.FirstOrDefault(o =>
+            o.Name == "--output" || o.Aliases.Contains("--output"));
+
+        // Assert
+        Assert.NotNull(outputOption);
+    }
+
+    #endregion
+
+    #region Task #11: Exit Code Verification Tests
+
+    [Theory]
+    [InlineData(0, "Success")]
+    [InlineData(1, "PolicyViolation")]
+    [InlineData(2, "SystemError")]
+    public void ExitCodes_HaveCorrectValues(int expectedCode, string codeName)
+    {
+        // Arrange & Act
+        var actualCode = codeName switch
+        {
+            "Success" => ExitCodes.Success,
+            "PolicyViolation" => ExitCodes.PolicyViolation,
+            "SystemError" => ExitCodes.SystemError,
+            _ => throw new ArgumentException($"Unknown exit code: {codeName}")
+        };
+
+        // Assert
+        Assert.Equal(expectedCode, actualCode);
+    }
+
+    [Fact]
+    public void ExitCodes_Success_IsZero()
+    {
+        Assert.Equal(0, ExitCodes.Success);
+    }
+
+    [Fact]
+    public void ExitCodes_PolicyViolation_IsOne()
+    {
+        Assert.Equal(1, ExitCodes.PolicyViolation);
+    }
+
+    [Fact]
+    public void ExitCodes_SystemError_IsTwo()
+    {
+        Assert.Equal(2, ExitCodes.SystemError);
+    }
+
+    #endregion
+
+    #region Task #12: CI/CD Integration Tests
+
+    [Fact]
+    public void ProofVerify_ParsesArtifactDigest()
+    {
+        // Arrange
+        var command = _commandGroup.BuildCommand();
+        var root = new RootCommand { command };
+        var parser = new Parser(root);
+
+        // Act
+        var result = parser.Parse("proof verify sha256:abc123def456");
+
+        // Assert
+        Assert.Empty(result.Errors);
+    }
+
+    [Fact]
+    public void ProofVerify_ParsesWithSbomOption()
+    {
+        // Arrange
+        var command = _commandGroup.BuildCommand();
+        var root = new RootCommand { command };
+        var parser = new Parser(root);
+
+        // Act
+        var result = parser.Parse("proof verify sha256:abc123 --sbom sbom.json");
+
+        // Assert
+        Assert.Empty(result.Errors);
+    }
+
+    [Fact]
+    public void ProofVerify_ParsesWithJsonOutput()
+    {
+        // Arrange
+        var command = _commandGroup.BuildCommand();
+        var root = new RootCommand { command };
+        var parser = new Parser(root);
+
+        // Act
+        var result = parser.Parse("proof verify sha256:abc123 --output json");
+
+        // Assert
+        Assert.Empty(result.Errors);
+    }
+
+    [Fact]
+    public void ProofVerify_ParsesWithOfflineMode()
+    {
+        // Arrange
+        var command = _commandGroup.BuildCommand();
+        var root = new RootCommand { command };
+        var parser = new Parser(root);
+
+        // Act
+        var result = parser.Parse("proof verify sha256:abc123 --offline");
+
+        // Assert
+        Assert.Empty(result.Errors);
+    }
+
+    [Fact]
+    public void ProofVerify_ParsesWithAllOptions()
+    {
+        // Arrange
+        var command = _commandGroup.BuildCommand();
+        var root = new RootCommand { command };
+        var parser = new Parser(root);
+
+        // Act
+        var result = parser.Parse(
+            "proof verify sha256:abc123 --sbom sbom.json --vex vex.json --offline --output json -v");
+
+        // Assert
+        Assert.Empty(result.Errors);
+    }
+
+    [Fact]
+    public void ProofVerify_FailsWithoutArtifact()
+    {
+        // Arrange
+        var command = _commandGroup.BuildCommand();
+        var root = new RootCommand { command };
+        var parser = new Parser(root);
+
+        // Act
+        var result = parser.Parse("proof verify");
+
+        // Assert
+        Assert.NotEmpty(result.Errors);
+    }
+
+    #endregion
+}
+
+/// <summary>
+/// Standard exit codes for CI/CD integration (§15.2).
+/// </summary>
+public static class ExitCodes
+{
+    /// <summary>No policy violations - safe to proceed.</summary>
+    public const int Success = 0;
+
+    /// <summary>Policy violation detected - block deployment.</summary>
+    public const int PolicyViolation = 1;
+
+    /// <summary>System/scanner error - cannot determine status.</summary>
+    public const int SystemError = 2;
+}