validate.test.js

describe('isEmpty method with the argument', () => {
    const validate = require('./validate');

    describe.each`
        str       | expected
        ${null}   | ${true}
        ${""}     | ${true}
        ${"word"} | ${false}
    `('$str', ({str, expected}) => {
        test(`returns ${expected}`, () => {
            expect(validate.isEmpty(str)).toBe(expected)
        });
    });
});