How to test validation annotations of a class using JUnit?

Question

I need to test the validation annotations but it looks like they do not work. I am not sure if the JUnit is also correct. Currently, the test will be passed but as you can s

Answer 1

import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import org.junit.Before;
import org.junit.Test;

public class ValidationTest {

    private Validator validator;

    @Before
    public void init() {

        ValidatorFactory vf = Validation.buildDefaultValidatorFactory();
        this.validator = vf.getValidator();

    }

    @Test
    public void prereqsMet() {
        Workshop validWorkshop = new Workshop(2, 2, true, 3);
        Set> violations = this.validator.validate(validWorkshop);
        assertTrue(violations.isEmpty());
    }  
}

Strictly speaking it is not a unit test, rather an Integration Test. In Unit Test you would like to test the validator logic only, without any dependencies to the SPI.

https://www.adam-bien.com/roller/abien/entry/unit_integration_testing_the_bean