    @Test
    public void checkCategoryIDs() {

        Assert.assertEquals(0, this.fastFood.getID());
        Assert.assertEquals(1, this.bars.getID());
        Assert.assertEquals(2, this.restaurants.getID());
        Assert.assertEquals(3, this.electronics.getID());
        Assert.assertEquals(4, this.clothes.getID());
        Assert.assertEquals(5, this.shops.getID());
        Assert.assertEquals(6, this.root.getID());
    }