Jest test

  https://github.com/dupontdenis/Jest-test1.git

test("Cat Boisson should has 2 articles", ()=> {

    expect(nbArtByCat.Boisson).toBe(2);

})

test("nb of Cats should be 5", ()=>{

    expect(Object.entries(nbArtByCat).length).toBe(5);

})