DeutschLernen/Tests/Unit/Domain/Entities/RefreshTokenTests.cs

using System;
using GermanApp.Domain.Entities;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace GermanApp.Tests.Unit.Domain.Entities;

/// <summary>
/// Unit tests for RefreshToken domain entity.
/// Tests the refresh token factory methods and business logic.
/// </summary>
[TestClass]
public class RefreshTokenTests
{
    #region Factory Method Tests

    [TestMethod]
    [TestCategory("Factory")]
    public void Create_WithValidParameters_ReturnsRefreshToken()
    {
        // Arrange
        int userId = 1;
        string token = "test-token-string";
        int expireDays = 7;

        // Act
        var refreshToken = RefreshToken.Create(userId, token, expireDays);

        // Assert
        Assert.IsNotNull(refreshToken);
        Assert.AreEqual(userId, refreshToken.UserId);
        Assert.AreEqual(token, refreshToken.Token);
        Assert.AreEqual(DateTime.UtcNow.Date, refreshToken.CreatedAt.Date);
        Assert.IsTrue(refreshToken.ExpiresAt > DateTime.UtcNow);
        Assert.IsTrue(refreshToken.IsActive);
        Assert.IsNull(refreshToken.RevokedAt);
    }

    [TestMethod]
    [TestCategory("Factory")]
    public void Create_WithDefaultExpireDays_Uses7Days()
    {
        // Arrange
        int userId = 1;
        string token = "test-token-string";

        // Act
        var refreshToken = RefreshToken.Create(userId, token);

        // Assert
        var timeDifference = refreshToken.ExpiresAt - DateTime.UtcNow;
        Assert.IsTrue(timeDifference.TotalDays > 6.9 && timeDifference.TotalDays < 7.1);
    }

    [TestMethod]
    [TestCategory("Factory")]
    public void Create_WithCustomExpireDays_SetsCorrectExpiry()
    {
        // Arrange
        int userId = 1;
        string token = "test-token";
        int expireDays = 30;

        // Act
        var refreshToken = RefreshToken.Create(userId, token, expireDays);

        // Assert
        var expectedExpiry = DateTime.UtcNow.AddDays(expireDays);
        var timeDifference = refreshToken.ExpiresAt - DateTime.UtcNow;
        Assert.IsTrue(timeDifference.TotalDays > 29.9 && timeDifference.TotalDays < 30.1);
    }

    #endregion

    #region Revoke Method Tests

    [TestMethod]
    [TestCategory("Behavior")]
    public void Revoke_ActiveToken_DeactivatesAndSetsRevokedAt()
    {
        // Arrange
        var refreshToken = RefreshToken.Create(1, "test-token");

        // Act
        refreshToken.Revoke();

        // Assert
        Assert.IsFalse(refreshToken.IsActive);
        Assert.IsNotNull(refreshToken.RevokedAt);
        Assert.IsTrue(refreshToken.RevokedAt > DateTime.UtcNow.AddSeconds(-1));
    }

    [TestMethod]
    [TestCategory("Behavior")]
    public void Revoke_AlreadyRevokedToken_UpdatesRevokedAt()
    {
        // Arrange
        var refreshToken = RefreshToken.Create(1, "test-token");
        refreshToken.Revoke();
        System.Threading.Thread.Sleep(10); // Small delay
        var firstRevokedAt = refreshToken.RevokedAt;

        // Act
        refreshToken.Revoke();

        // Assert
        Assert.IsFalse(refreshToken.IsActive);
        Assert.IsNotNull(refreshToken.RevokedAt);
        Assert.IsTrue(refreshToken.RevokedAt >= firstRevokedAt);
    }

    #endregion

    #region IsExpired Method Tests

    [TestMethod]
    [TestCategory("Query")]
    public void IsExpired_NotExpiredToken_ReturnsFalse()
    {
        // Arrange
        var refreshToken = RefreshToken.Create(1, "test-token", 7);

        // Act
        var isExpired = refreshToken.IsExpired();

        // Assert
        Assert.IsFalse(isExpired);
    }

    [TestMethod]
    [TestCategory("Query")]
    public void IsExpired_ExpiredToken_ReturnsTrue()
    {
        // Arrange
        var refreshToken = RefreshToken.Create(1, "test-token");
        refreshToken.ExpiresAt = DateTime.UtcNow.AddDays(-1); // Set to past

        // Act
        var isExpired = refreshToken.IsExpired();

        // Assert
        Assert.IsTrue(isExpired);
    }

    [TestMethod]
    [TestCategory("Query")]
    public void IsExpired_ExactlyAtExpiryTime_ReturnsTrue()
    {
        // Arrange
        var refreshToken = RefreshToken.Create(1, "test-token");
        refreshToken.ExpiresAt = DateTime.UtcNow; // Set to exactly now

        // Act
        var isExpired = refreshToken.IsExpired();

        // Assert
        Assert.IsTrue(isExpired);
    }

    [TestMethod]
    [TestCategory("Query")]
    public void IsExpired_FarFutureExpiry_ReturnsFalse()
    {
        // Arrange
        var refreshToken = RefreshToken.Create(1, "test-token");
        refreshToken.ExpiresAt = DateTime.UtcNow.AddYears(1);

        // Act
        var isExpired = refreshToken.IsExpired();

        // Assert
        Assert.IsFalse(isExpired);
    }

    #endregion

    #region IsValid Method Tests

    [TestMethod]
    [TestCategory("Query")]
    public void IsValid_ActiveNotExpiredToken_ReturnsTrue()
    {
        // Arrange
        var refreshToken = RefreshToken.Create(1, "test-token", 7);

        // Act
        var isValid = refreshToken.IsValid();

        // Assert
        Assert.IsTrue(isValid);
    }

    [TestMethod]
    [TestCategory("Query")]
    public void IsValid_RevokedToken_ReturnsFalse()
    {
        // Arrange
        var refreshToken = RefreshToken.Create(1, "test-token", 7);
        refreshToken.Revoke();

        // Act
        var isValid = refreshToken.IsValid();

        // Assert
        Assert.IsFalse(isValid);
    }

    [TestMethod]
    [TestCategory("Query")]
    public void IsValid_ExpiredToken_ReturnsFalse()
    {
        // Arrange
        var refreshToken = RefreshToken.Create(1, "test-token");
        refreshToken.ExpiresAt = DateTime.UtcNow.AddDays(-1);

        // Act
        var isValid = refreshToken.IsValid();

        // Assert
        Assert.IsFalse(isValid);
    }

    [TestMethod]
    [TestCategory("Query")]
    public void IsValid_RevokedAndExpiredToken_ReturnsFalse()
    {
        // Arrange
        var refreshToken = RefreshToken.Create(1, "test-token");
        refreshToken.Revoke();
        refreshToken.ExpiresAt = DateTime.UtcNow.AddDays(-1);

        // Act
        var isValid = refreshToken.IsValid();

        // Assert
        Assert.IsFalse(isValid);
    }

    #endregion

    #region Property Tests

    [TestMethod]
    [TestCategory("Property")]
    public void Id_HasDefaultValueOfZero()
    {
        // Arrange & Act
        var refreshToken = RefreshToken.Create(1, "test-token");

        // Assert
        Assert.AreEqual(0, refreshToken.Id);
    }

    [TestMethod]
    [TestCategory("Property")]
    public void UserId_IsSetCorrectly()
    {
        // Arrange
        int userId = 42;

        // Act
        var refreshToken = RefreshToken.Create(userId, "test-token");

        // Assert
        Assert.AreEqual(userId, refreshToken.UserId);
    }

    [TestMethod]
    [TestCategory("Property")]
    public void Token_IsSetCorrectly()
    {
        // Arrange
        string tokenString = "test-token-12345";

        // Act
        var refreshToken = RefreshToken.Create(1, tokenString);

        // Assert
        Assert.AreEqual(tokenString, refreshToken.Token);
    }

    [TestMethod]
    [TestCategory("Property")]
    public void IsActive_HasDefaultValueOfTrue()
    {
        // Arrange & Act
        var refreshToken = RefreshToken.Create(1, "test-token");

        // Assert
        Assert.IsTrue(refreshToken.IsActive);
    }

    [TestMethod]
    [TestCategory("Property")]
    public void RevokedAt_IsNullByDefault()
    {
        // Arrange & Act
        var refreshToken = RefreshToken.Create(1, "test-token");

        // Assert
        Assert.IsNull(refreshToken.RevokedAt);
    }

    [TestMethod]
    [TestCategory("Property")]
    public void CreatedAt_IsSetToCurrentTime()
    {
        // Arrange
        var beforeCreation = DateTime.UtcNow;

        // Act
        var refreshToken = RefreshToken.Create(1, "test-token");
        var afterCreation = DateTime.UtcNow;

        // Assert
        Assert.IsTrue(refreshToken.CreatedAt >= beforeCreation);
        Assert.IsTrue(refreshToken.CreatedAt <= afterCreation);
    }

    #endregion
}