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Week6/project/contracts/HelloWorld.sol

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+// SPDX-License-Identifier: GPL-3.0
+pragma solidity >=0.7.0 <0.9.0;
+
+contract HelloWorld {
+    string private text;
+    address public owner;
+
+    constructor() {
+        text = "Hello World";
+        owner = msg.sender;
+    }
+
+    function helloWorld() public view returns (string memory) {
+        return text;
+    }
+
+    function setText(string calldata newText) public onlyOwner {
+        text = newText;
+    }
+
+    function transferOwnership(address newOwner) public onlyOwner {
+        owner = newOwner;
+    }
+
+    modifier onlyOwner()
+    {
+        require (msg.sender == owner, "Caller is not the owner");
+        _;
+    }
+}

Week6/project/tests/HelloWorld.ts

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+import { expect } from "chai";
+import { ethers } from "hardhat";
+// https://github.com/dethcrypto/TypeChain
+import { HelloWorld } from "../typechain-types";
+
+// https://mochajs.org/#getting-started
+describe("HelloWorld", function () {
+  let helloWorldContract: HelloWorld;
+
+  // https://mochajs.org/#hooks
+  beforeEach(async function () {
+    // https://hardhat.org/plugins/nomiclabs-hardhat-ethers.html#helpers
+    const helloWorldFactory = await ethers.getContractFactory("HelloWorld");
+    // https://docs.ethers.io/v5/api/contract/contract-factory/#ContractFactory-deploy
+    helloWorldContract = await helloWorldFactory.deploy() as HelloWorld;
+    // https://docs.ethers.io/v5/api/contract/contract/#Contract-deployed
+    await helloWorldContract.deployed();
+  });
+
+  it("Should give a Hello World", async function () {
+    // https://docs.ethers.io/v5/api/contract/contract/#Contract-functionsCall
+    const helloWorldText = await helloWorldContract.helloWorld();
+    // https://www.chaijs.com/api/bdd/#method_equal
+    expect(helloWorldText).to.equal("Hello World");
+  });
+
+  it("Should set owner to deployer account", async function () {
+    // https://hardhat.org/plugins/nomiclabs-hardhat-ethers.html#helpers
+    const accounts = await ethers.getSigners();
+    // https://docs.ethers.io/v5/api/contract/contract/#Contract-functionsCall
+    const contractOwner = await helloWorldContract.owner();
+    // https://www.chaijs.com/api/bdd/#method_equal
+    expect(contractOwner).to.equal(accounts[0].address);
+  });
+
+  it("Should not allow anyone other than owner to call transferOwnership", async function () {
+    // https://hardhat.org/plugins/nomiclabs-hardhat-ethers.html#helpers
+    const accounts = await ethers.getSigners();
+    // https://docs.ethers.io/v5/api/contract/contract/#Contract-connect
+    // https://docs.ethers.io/v5/api/contract/contract/#contract-functionsSend
+    // https://hardhat.org/hardhat-chai-matchers/docs/overview#reverts
+    await expect(
+      helloWorldContract
+        .connect(accounts[1])
+        .transferOwnership(accounts[1].address)
+    ).to.be.revertedWith("Caller is not the owner");
+  });
+
+  it("Should execute transferOwnership correctly", async function () {
+    // TODO
+    throw Error("Not implemented");
+  });
+
+  it("Should not allow anyone other than owner to change text", async function () {
+    // TODO
+    throw Error("Not implemented");
+  });
+
+  it("Should change text correctly", async function () {
+    // TODO
+    throw Error("Not implemented");
+  });
+});