updated: using ts setup with lock contract and tests

.gitignore

@@ -20,9 +20,12 @@ yarn.lock
 # Project files, i.e. `.project`, `.actionScriptProperties` and `.flexProperties`
 # should NOT be excluded as they contain compiler settings and other important
 # information for Eclipse / Flash Builder.
+.DS_Store
 
 #Hardhat files
 cache
 artifacts/
 coverage/
 coverage.json
+typechain/
+typechain-types/

README.md

@@ -2,15 +2,23 @@
 
 This project demonstrates a basic Hardhat use case. It comes with a sample contract, a test for that contract, a sample script that deploys that contract, and an example of a task implementation, which simply lists the available accounts with balances.
 
-> Recommended to use Node.js v16+ and npm v8+
-
-> Rename `env.example` to `.env` and add your env specific keys.
+> Recommended to use Node.js v18+ and npm v8+
 
 Try running some of the following tasks:
 
 ```shell
 npm install
 
+# Set/Read/Remove hardhat config variables
+# npx hardhat vars set API_KEY
+# npx hardhat vars get API_KEY
+# npx hardhat vars DELETE API_KEY
+# npx hardhat vars list
+
+# set PRIVATE_KEY
+npx hardhat vars set PRIVATE_KEY
+
+
 # starts local node
 npx hardhat node
 
@@ -20,8 +28,8 @@ npx hardhat compile
 # deploy contract defined in tasks on specified network
 npx hardhat deploy --network local
 
-# deploy contract in scripts/deploy.js on specified network
-npx hardhat run scripts/deploy.js --network local
+# deploy contract in scripts/deploy.ts on specified network
+npx hardhat run scripts/deploy.ts --network local
 
 # verify contract
 npx hardhat verify --network <deployed network> <deployed contract address> "<constructor1>" "<constructor2>"

contracts/Lock.sol

@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.9;
+
+// Uncomment this line to use console.log
+// import "hardhat/console.sol";
+
+contract Lock {
+    uint public unlockTime;
+    address payable public owner;
+
+    event Withdrawal(uint amount, uint when);
+
+    constructor(uint _unlockTime) payable {
+        require(
+            block.timestamp < _unlockTime,
+            "Unlock time should be in the future"
+        );
+
+        unlockTime = _unlockTime;
+        owner = payable(msg.sender);
+    }
+
+    function withdraw() public {
+        // Uncomment this line, and the import of "hardhat/console.sol", to print a log in your terminal
+        // console.log("Unlock time is %o and block timestamp is %o", unlockTime, block.timestamp);
+
+        require(block.timestamp >= unlockTime, "You can't withdraw yet");
+        require(msg.sender == owner, "You aren't the owner");
+
+        emit Withdrawal(address(this).balance, block.timestamp);
+
+        owner.transfer(address(this).balance);
+    }
+}

hardhat.config.ts

@@ -0,0 +1,20 @@
+import { HardhatUserConfig, vars } from "hardhat/config";
+import "@nomicfoundation/hardhat-toolbox";
+
+const accounts = vars.has("PRIVATE_KEY") ? [vars.get("PRIVATE_KEY")] : [];
+
+const config: HardhatUserConfig = {
+  solidity: "0.8.19",
+  defaultNetwork: "local",
+  networks: {
+    local: {
+      url: "http://127.0.0.1:8545"
+    },
+    mumbai: {
+      url: "https://rpc-mumbai.maticvigil.com",
+      accounts
+    }
+  }
+};
+
+export default config;

package.json

@@ -1,8 +1,8 @@
 {
   "name": "hardhat-boilerplate-minimal",
-  "version": "1.0.0",
+  "version": "1.0.1",
   "description": "Minimal hardhat boilerplate for Dapp development",
-  "main": "index.js",
+  "private": true,
   "scripts": {
     "test": "npx hardhat test",
     "compile": "npx hardhat compile",
@@ -13,7 +13,6 @@
   "license": "ISC",
   "devDependencies": {
     "@nomicfoundation/hardhat-toolbox": "^3.0.0",
-    "dotenv": "^16.3.1",
-    "hardhat": "^2.17.4"
+    "hardhat": "^2.19.0"
   }
 }

scripts/deploy.ts

@@ -0,0 +1,31 @@
+import { ethers } from "hardhat";
+
+async function main() {
+  const currentTimestampInSeconds = Math.round(Date.now() / 1000);
+  const unlockTime = currentTimestampInSeconds + 60;
+  const lockedAmount = ethers.parseEther("0.001");
+
+  const lockInstance = await ethers.deployContract("Lock", [unlockTime], {
+    value: lockedAmount
+  });
+
+  await lockInstance.waitForDeployment();
+  return lockInstance;
+}
+
+main()
+  .then(async (lockInstance) => {
+    console.log("Lock Contract deployed to:", lockInstance.target);
+    // Read from the contract
+    const unlockTime = await lockInstance.unlockTime();
+    console.log("Unlock time:", unlockTime.toString());
+
+    // Write to the contract
+    // const tx = await lockInstance.withdraw();
+    // await tx.wait();
+    // console.log("Withdrawn!");
+  })
+  .catch((error) => {
+    console.error(error);
+    process.exitCode = 1;
+  });

test/Lock.ts

@@ -0,0 +1,127 @@
+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("Lock", function () {
+  // We define a fixture to reuse the same setup in every test.
+  // We use loadFixture to run this setup once, snapshot that state,
+  // and reset Hardhat Network to that snapshot in every test.
+  async function deployOneYearLockFixture() {
+    const ONE_YEAR_IN_SECS = 365 * 24 * 60 * 60;
+    const ONE_GWEI = 1_000_000_000;
+
+    const lockedAmount = ONE_GWEI;
+    const unlockTime = (await time.latest()) + ONE_YEAR_IN_SECS;
+
+    // Contracts are deployed using the first signer/account by default
+    const [owner, otherAccount] = await ethers.getSigners();
+
+    const Lock = await ethers.getContractFactory("Lock");
+    const lock = await Lock.deploy(unlockTime, { value: lockedAmount });
+
+    return { lock, unlockTime, lockedAmount, owner, otherAccount };
+  }
+
+  describe("Deployment", function () {
+    it("Should set the right unlockTime", async function () {
+      const { lock, unlockTime } = await loadFixture(deployOneYearLockFixture);
+
+      expect(await lock.unlockTime()).to.equal(unlockTime);
+    });
+
+    it("Should set the right owner", async function () {
+      const { lock, owner } = await loadFixture(deployOneYearLockFixture);
+
+      expect(await lock.owner()).to.equal(owner.address);
+    });
+
+    it("Should receive and store the funds to lock", async function () {
+      const { lock, lockedAmount } = await loadFixture(
+        deployOneYearLockFixture
+      );
+
+      expect(await ethers.provider.getBalance(lock.target)).to.equal(
+        lockedAmount
+      );
+    });
+
+    it("Should fail if the unlockTime is not in the future", async function () {
+      // We don't use the fixture here because we want a different deployment
+      const latestTime = await time.latest();
+      const Lock = await ethers.getContractFactory("Lock");
+      await expect(Lock.deploy(latestTime, { value: 1 })).to.be.revertedWith(
+        "Unlock time should be in the future"
+      );
+    });
+  });
+
+  describe("Withdrawals", function () {
+    describe("Validations", function () {
+      it("Should revert with the right error if called too soon", async function () {
+        const { lock } = await loadFixture(deployOneYearLockFixture);
+
+        await expect(lock.withdraw()).to.be.revertedWith(
+          "You can't withdraw yet"
+        );
+      });
+
+      it("Should revert with the right error if called from another account", async function () {
+        const { lock, unlockTime, otherAccount } = await loadFixture(
+          deployOneYearLockFixture
+        );
+
+        // We can increase the time in Hardhat Network
+        await time.increaseTo(unlockTime);
+
+        // We use lock.connect() to send a transaction from another account
+        await expect(lock.connect(otherAccount).withdraw()).to.be.revertedWith(
+          "You aren't the owner"
+        );
+      });
+
+      it("Shouldn't fail if the unlockTime has arrived and the owner calls it", async function () {
+        const { lock, unlockTime } = await loadFixture(
+          deployOneYearLockFixture
+        );
+
+        // Transactions are sent using the first signer by default
+        await time.increaseTo(unlockTime);
+
+        await expect(lock.withdraw()).not.to.be.reverted;
+      });
+    });
+
+    describe("Events", function () {
+      it("Should emit an event on withdrawals", async function () {
+        const { lock, unlockTime, lockedAmount } = await loadFixture(
+          deployOneYearLockFixture
+        );
+
+        await time.increaseTo(unlockTime);
+
+        await expect(lock.withdraw())
+          .to.emit(lock, "Withdrawal")
+          .withArgs(lockedAmount, anyValue); // We accept any value as `when` arg
+      });
+    });
+
+    describe("Transfers", function () {
+      it("Should transfer the funds to the owner", async function () {
+        const { lock, unlockTime, lockedAmount, owner } = await loadFixture(
+          deployOneYearLockFixture
+        );
+
+        await time.increaseTo(unlockTime);
+
+        await expect(lock.withdraw()).to.changeEtherBalances(
+          [owner, lock],
+          [lockedAmount, -lockedAmount]
+        );
+      });
+    });
+  });
+});