dotnet unit tests

tests/Application.UnitTest/Services/AuthenticationServiceTests.cs

@@ -134,6 +134,28 @@ public class AuthenticationServiceTests
         Assert.Equal(AuthError.UserNotFound, result.Error);
     }
 
+    [Fact]
+    public async Task LoginAsync_ShouldReturnFailure_WhenPasswordIsWrong()
+    {
+        var password = "ValidP@ss1!";
+        var user = new User
+        {
+            Id = 1,
+            Username = "testuser",
+            Email = "test@example.com",
+            Password = new PasswordHasher<User>().HashPassword(
+                new User { Username = "testuser", Email = "test@example.com", Password = password },
+                password)
+        };
+        var request = new LoginRequest(user.Email, "WrongPassword1!");
+        _userRepository.GetUserByEmailAsync(request.Email).Returns(user);
+
+        var result = await _sut.LoginAsync(request);
+
+        Assert.True(result.IsFailure);
+        Assert.Equal(AuthError.InvalidPassword, result.Error);
+    }
+
     [Fact]
     public async Task RefreshTokensAsync_ShouldReturnSuccess_WhenRefreshTokenIsValid()
     {