using Moq to mock a Repository and test an user update operation

UpdateUserHandlerTests.cs

using Xunit;
using Moq;

 public class UpdateUserHandlerTests
 {
    [Fact]
    public async Task should_Update_user_when_command_valid()
    {
        var command = new UpdateUser(id: Guid.NewGuid(), firstname: "lorem", lastname: "ipsum");

        var user = new Infrastructure.Entities.User()
        {
            Id = command.UserId
        };
        var mockRepo = new Mock<IRepository<Infrastructure.Entities.UserData>>();
        mockRepo.Setup(r => r.FindOneAsync(It.IsAny<Expression<Func<Infrastructure.Entities.UserData, bool>>>()))
               .ReturnsAsync(user);

        var mockDbContext = new Mock<IUserServiceDbContext>();
        mockDbContext.Setup(db => db.UsersData).Returns(mockRepo.Object);
        
        var sut = new UpdateUserHandler(mockDbContext.Object);
        await sut.Handle(command);

        mockRepo.Verify(m => m.UpsertOneAsync(It.IsAny<Expression<Func<Infrastructure.Entities.UserData, bool>>>(),  It.IsAny<Infrastructure.Entities.UserData>()), Times.Once());
    }
 }