TDD Criticisms + Advice Please!

// I'm really really new to using TDD and Jest, are there any criticisms you guys see in my current test.js file to help cut off bad habits early? I'll take any advice too to build better tests!

// Right now I'm looking into describe to help structure my tests!

import { setup } from '../src/index.js';

describe.skip('shipFactory functionality', () => {
    let ship = setup.shipFactory(1);
    ship.position = [{x: 1, y: 1}];
    ship.isHit({x: 1, y: 1});

    let ship2 = setup.shipFactory(3);
    ship2.position = [{x: 1, y: 1}, {x: 2, y: 1}, {x: 3, y: 1}];

    // Ship Factory Function
    test.skip('Returns a ship object', () => {
        expect(setup.shipFactory()).toEqual({
            length, damageTaken, position, isHit, isSunk
        });
    });

    // isHit method
    test.skip('isHit will return true on actual hit', () => {
        expect(ship.isHit({x: 1, y: 1})).toBe(true);
    });

    // isSunk method
    test.skip('isSunk will add a sunk = true property on sunken ship' , () => {
        expect(ship.sunk).toBe(true);
    });

    test.skip("isSunk will not change on a not sunk ship", () => {
        expect(ship2.isSunk()).toBe(undefined);
    })

    // damageTaken property
    test.skip('ship.damageTaken should = 1', () => {
        expect(ship.damageTaken).toBe(1);
    });
})