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

I found a simple way to test validation annotations using javax:

Declare the Validator at Class level:

private final Validator validator = Validation.buildDefaultValidatorFactory().getValidator();

Then in your test simply call it on the object you require validation on, with what exception you are validating:

Set violations = validator.validate(theInstanceOfTheClassYouAreValidating);

Then simply assert the number of expected violations:

assertThat(violations.size()).isEqualTo(1);

You will need to add this to your dependencies (gradle):

compile group: 'javax.validation', name: 'validation-api', version: '2.0.1.Final'