public async void get_should_return_user()
{
// Arrange
const long id = 2;
var userRepository = new Mock<IRepository<User>>();
userRepository.Setup(x => x.FindOne(It.IsAny<Expression<Func<User, bool>>>())).Returns(new User { Id = id });
// Act
var userService = new UserService(userRepository.Object);
var user = await userService.Get(id);
// Assert
Assert.NotNull(user);
userRepository.Verify(x => x.FindOne(It.IsAny<Expression<Func<User, bool>>>()), Times.Once);
}
