Testing temporal values with AssertJ (within)

UserTest.java

import static org.assertj.core.api.Assertions.within;
//...

public class UserTest {
  private UserService userService = new UserService();
  
  @Test
  public void given_valid_inputs_creation_is_ok() throws Exception {
    User userToCreate = new User("name");  
    User user = userService.create(userToCreate);
    //...
    // the date of user creation is close to 'now'
    assertThat(user.getCreationDate()).isCloseTo(LocalDateTime.now(), within(1, ChronoUnit.SECONDS));
  }
}