the-biergarten-app/web/backend/Features/Features.Auth.Tests/Services/TokenServiceRefreshTests.cs

using System.IdentityModel.Tokens.Jwt;
using System.Security.Claims;
using Domain.Entities;
using Domain.Exceptions;
using Features.Auth.Repository;
using Features.Auth.Services;
using FluentAssertions;
using Infrastructure.Jwt;
using Moq;

namespace Features.Auth.Tests.Services;

public class TokenServiceRefreshTests
{
    private readonly Mock<IAuthRepository> _authRepositoryMock;
    private readonly Mock<ITokenInfrastructure> _tokenInfraMock;
    private readonly TokenService _tokenService;

    public TokenServiceRefreshTests()
    {
        _tokenInfraMock = new Mock<ITokenInfrastructure>();
        _authRepositoryMock = new Mock<IAuthRepository>();

        // Set environment variables for tokens
        Environment.SetEnvironmentVariable("ACCESS_TOKEN_SECRET", "test-access-secret-that-is-very-long-1234567890");
        Environment.SetEnvironmentVariable("REFRESH_TOKEN_SECRET", "test-refresh-secret-that-is-very-long-1234567890");
        Environment.SetEnvironmentVariable("CONFIRMATION_TOKEN_SECRET",
            "test-confirmation-secret-that-is-very-long-1234567890");

        _tokenService = new TokenService(
            _tokenInfraMock.Object,
            _authRepositoryMock.Object
        );
    }

    [Fact]
    public async Task RefreshTokenAsync_WithValidRefreshToken_ReturnsNewTokens()
    {
        // Arrange
        Guid userId = Guid.NewGuid();
        const string username = "testuser";
        const string refreshToken = "valid-refresh-token";

        List<Claim> claims = new()
        {
            new Claim(JwtRegisteredClaimNames.Sub, userId.ToString()),
            new Claim(JwtRegisteredClaimNames.UniqueName, username),
            new Claim(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString())
        };

        ClaimsIdentity claimsIdentity = new(claims);
        ClaimsPrincipal principal = new(claimsIdentity);

        UserAccount userAccount = new()
        {
            UserAccountId = userId,
            Username = username,
            FirstName = "Test",
            LastName = "User",
            Email = "test@example.com",
            DateOfBirth = new DateTime(1990, 1, 1)
        };

        // Mock the validation of refresh token
        _tokenInfraMock
            .Setup(x => x.ValidateJwtAsync(refreshToken, It.IsAny<string>()))
            .ReturnsAsync(principal);

        // Mock the generation of new tokens
        _tokenInfraMock
            .Setup(x => x.GenerateJwt(userId, username, It.IsAny<DateTime>(), It.IsAny<string>()))
            .Returns((Guid _, string _, DateTime _, string _) => $"generated-token-{Guid.NewGuid()}");

        _authRepositoryMock
            .Setup(x => x.GetUserByIdAsync(userId))
            .ReturnsAsync(userAccount);

        // Act
        RefreshTokenResult result = await _tokenService.RefreshTokenAsync(refreshToken);

        // Assert
        result.Should().NotBeNull();
        result.UserAccount.UserAccountId.Should().Be(userId);
        result.UserAccount.Username.Should().Be(username);
        result.AccessToken.Should().NotBeEmpty();
        result.RefreshToken.Should().NotBeEmpty();

        _authRepositoryMock.Verify(
            x => x.GetUserByIdAsync(userId),
            Times.Once
        );

        // Verify tokens were generated (called twice - once for access, once for refresh)
        _tokenInfraMock.Verify(
            x => x.GenerateJwt(It.IsAny<Guid>(), It.IsAny<string>(), It.IsAny<DateTime>(), It.IsAny<string>()),
            Times.Exactly(2)
        );
    }

    [Fact]
    public async Task RefreshTokenAsync_WithInvalidRefreshToken_ThrowsUnauthorizedException()
    {
        // Arrange
        const string invalidToken = "invalid-refresh-token";

        _tokenInfraMock
            .Setup(x => x.ValidateJwtAsync(invalidToken, It.IsAny<string>()))
            .ThrowsAsync(new UnauthorizedException("Invalid refresh token"));

        // Act & Assert
        await FluentActions.Invoking(async () =>
            await _tokenService.RefreshTokenAsync(invalidToken)
        ).Should().ThrowAsync<UnauthorizedException>();
    }

    [Fact]
    public async Task RefreshTokenAsync_WithExpiredRefreshToken_ThrowsUnauthorizedException()
    {
        // Arrange
        const string expiredToken = "expired-refresh-token";

        _tokenInfraMock
            .Setup(x => x.ValidateJwtAsync(expiredToken, It.IsAny<string>()))
            .ThrowsAsync(new UnauthorizedException("Refresh token has expired"));

        // Act & Assert
        await FluentActions.Invoking(async () =>
            await _tokenService.RefreshTokenAsync(expiredToken)
        ).Should().ThrowAsync<UnauthorizedException>();
    }

    [Fact]
    public async Task RefreshTokenAsync_WithNonExistentUser_ThrowsUnauthorizedException()
    {
        // Arrange
        Guid userId = Guid.NewGuid();
        const string username = "testuser";
        const string refreshToken = "valid-refresh-token";

        List<Claim> claims = new()
        {
            new Claim(JwtRegisteredClaimNames.Sub, userId.ToString()),
            new Claim(JwtRegisteredClaimNames.UniqueName, username),
            new Claim(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString())
        };

        ClaimsIdentity claimsIdentity = new(claims);
        ClaimsPrincipal principal = new(claimsIdentity);

        _tokenInfraMock
            .Setup(x => x.ValidateJwtAsync(refreshToken, It.IsAny<string>()))
            .ReturnsAsync(principal);

        _authRepositoryMock
            .Setup(x => x.GetUserByIdAsync(userId))
            .ReturnsAsync((UserAccount?)null);

        // Act & Assert
        await FluentActions.Invoking(async () =>
                await _tokenService.RefreshTokenAsync(refreshToken)
            ).Should().ThrowAsync<UnauthorizedException>()
            .WithMessage("*User account not found*");
    }
}