Govor/Govor.Application.Tests/Services/Authentication/JwtServiceTests.cs

using System.IdentityModel.Tokens.Jwt;
using System.Security.Claims;
using System.Text;
using AutoFixture;
using Govor.Application.Interfaces.Authentication;
using Govor.Application.Services.Authentication;
using Govor.Core.Models.Users;
using Microsoft.Extensions.Options;
using Microsoft.IdentityModel.Tokens;
using Moq;

namespace Govor.Application.Tests.Services.Authentication;

[TestFixture]
public class JwtServiceTests
{
    private Fixture _fixture;
    private Mock<IOptions<JwtAccessOption>> _jwtOptionsMock;
    private Mock<IOptions<JwtRefreshOption>> _jwtRefreshOptionsMock;
    private Mock<IInvitesService> _invitesServiceMock;
    private IJwtService _jwtService;

    private JwtAccessOption _testJwtAccessOptions;
    private JwtRefreshOption _testJwtRefreshOptions;

    [SetUp]
    public void SetUp()
    {
        _fixture = new Fixture();
        _fixture.Behaviors.OfType<ThrowingRecursionBehavior>().ToList().ForEach(b => _fixture.Behaviors.Remove(b));
        _fixture.Behaviors.Add(new OmitOnRecursionBehavior());

        _testJwtAccessOptions = new JwtAccessOption
        {
            SecretKey = "THIS_IS_A_TEST_SECRET_KEY_THAT_IS_LONG_ENOUGH_1234", // Ensure key size is sufficient for HMACSHA256
            Minutes = 5
        };

        _testJwtRefreshOptions = new JwtRefreshOption()
        {
            RefreshTokenLifetimeDays = 30
        };
        
        _jwtOptionsMock = new Mock<IOptions<JwtAccessOption>>();
        _jwtOptionsMock.Setup(o => o.Value).Returns(_testJwtAccessOptions);
        
        _jwtRefreshOptionsMock = new Mock<IOptions<JwtRefreshOption>>();
        _jwtRefreshOptionsMock.Setup(o => o.Value).Returns(_testJwtRefreshOptions);
        
        _invitesServiceMock = new Mock<IInvitesService>();
        
        _jwtService = new JwtService(
            _jwtOptionsMock.Object,
            _jwtRefreshOptionsMock.Object,
            _invitesServiceMock.Object);
    }

    [Test]
    public async Task GenerateJwtToken_ShouldReturnValidJwtString()
    {
        // Arrange
        var user = _fixture.Create<User>();
        var expectedRole = "User";
        _invitesServiceMock.Setup(s => s.GetRoleAsync(user)).Returns(Task.FromResult(expectedRole));
        // Act 
        var tokenString = await _jwtService.GenerateAccessTokenAsync(user);

        // Assert
        Assert.That(tokenString, Is.Not.Null.And.Not.Empty);
        
        // Attempt to parse the token to ensure it's a JWT
        var handler = new JwtSecurityTokenHandler();
        Assert.DoesNotThrow(() => handler.ReadJwtToken(tokenString));
    }
    
    [Test]
    public async Task GenerateRefreshTokenAsync_ReturnsValidRefreshToken()
    {
        // Arrange
        var user = new User { Id = Guid.NewGuid() };

        // Act
        var token = await _jwtService.GenerateRefreshTokenAsync(user);

        // Assert
        Assert.That(token, Is.Not.Null);

        var handler = new JwtSecurityTokenHandler();
        var jwt = handler.ReadJwtToken(token);

        Assert.That(user.Id.ToString(), Is.EqualTo(jwt.Claims.First(c => c.Type == "userId").Value));
        Assert.That("refresh",Is.EqualTo(jwt.Claims.First(c => c.Type == "tokenType").Value));
    }
    
    [Test]
    public async Task GetPrincipalFromExpiredToken_ReturnsValidClaimsPrincipal()
    {
        // Arrange
        var userId = Guid.NewGuid();
        var handler = new JwtSecurityTokenHandler();
        var key = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(_testJwtAccessOptions.SecretKey));

        var now = DateTime.UtcNow;

        var token = handler.CreateToken(new SecurityTokenDescriptor
        {
            Subject = new ClaimsIdentity(new[]
            {
                new Claim("userId", userId.ToString())
            }),
            NotBefore = now.AddSeconds(-10),
            IssuedAt = now.AddSeconds(-10),
            Expires = now.AddSeconds(-5),
            SigningCredentials = new SigningCredentials(key, SecurityAlgorithms.HmacSha256)
        });

        var expiredToken = handler.WriteToken(token);

        // Act
        var principal = _jwtService.GetPrincipalFromExpiredToken(expiredToken);

        // Assert
        Assert.That(principal, Is.Not.Null);
        var claim = principal.FindFirst("userId");
        Assert.That(claim, Is.Not.Null);
        Assert.That(userId.ToString(), Is.EqualTo(claim.Value));
    }
}