Original chai assertion before running through the Jest code mod

externalsConvertersTest.js

describe('When I call bool', () => 
    describe('with “TRUE”', () => {
        let result;
        beforeEach(() => result = bool('TRUE'));
        describe('the result', () => it('is boolean value true', () =>
            result.should.be.a('boolean').and.equal(true)
        ));
    })
);