Todo.ts

import {
    time,
    loadFixture,
  } from "@nomicfoundation/hardhat-toolbox/network-helpers";
  import { anyValue } from "@nomicfoundation/hardhat-chai-matchers/withArgs";
  import { expect } from "chai";
  import { ethers } from "hardhat";
  
  describe("Todo List", function () { 
    async function deployTodoList() {    
      
  
      const TodoList = await ethers.getContractFactory("TodoList");
      const todolist= await TodoList.deploy();
  
      return { todolist };
    }
  
    describe("create Todo List", function () {
      it("Should set and get todo lists", async function () {
        const { todolist } = await loadFixture(deployTodoList);
       
        const tx = await todolist.createTodos("clean", "clothes");
        const todos = await todolist.getTodos();
  
        expect(todos).with.lengthOf(1);
        expect(todos[0]).eq("clean");
        expect(todos[1]).eq("clothes");
    
      });  
    });
  });

TodoList.sol

//SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

contract TodoList {
//struct with the todo list
    struct Todo {
        string Title;
        string description;
        bool completed;
    }
//array of structs
    Todo[] todos;

//add items to the array
    function createTodos(string memory _title, string memory _description) public {
        Todo memory todo;
        todo.Title = _title;
        todo.description = _description;
        todos.push(todo);    
    }

//returns the array of structs
    function getTodos() public view returns(Todo[] memory) {
        return todos;
    }

//false to true
    function toggleTodos(uint _index) external {
        todos[_index].completed = !todos[_index].completed;        
    }
    
   //updates the structs 
    function updateTodos(uint _index, string memory _title, string memory _description) external {
        todos[_index].Title = _title;
        todos[_index].description = _description;
    }

    //deletes a struct from the array
    function deleteTodos(uint _index) external {
        delete todos[_index];
    }

}