How can I test custom validators in my application?

How can I test custom validators in my application?

You can test custom validators by creating unit tests that check various input scenarios and expected outcomes.

What tools can I use for unit testing these validators?

Popular tools include Jest, Mocha, and Jasmine for JavaScript, or JUnit for Java applications.

Can you give me an example of a unit test for a custom validator?

Sure! Here's a simple example using Jest:

test('validates email format', () => {
  expect(validateEmail('test@example.com')).toBe(true);
  expect(validateEmail('invalid-email')).toBe(false);
});

How do I handle asynchronous validation?

For asynchronous validation, you can return a promise in your validator and use async/await in your tests.