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Tooling · hard

40. Testing and deploying with Hardhat

JavaScript tests, scripts and verification.

1 min read3 questionsup to 50 XPtopic 40/50

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Hardhat pairs a JS/TS test suite with ethers. Deployment scripts fetch a factory, deploy, wait for confirmations, then verify the source on the block explorer.

javascript
const f = await ethers.getContractFactory("SimpleStaking");
const c = await f.deploy(rewardRate);
await c.waitForDeployment();
console.log(await c.getAddress());

Keep private keys in environment variables, never in the repo, and always deploy to a testnet such as Base Sepolia first.

How to study this topic

  1. 1. Read the explanation once end to end, skipping the code.
  2. 2. Re-read the code snippets and say out loud what each line does.
  3. 3. Answer the quiz without scrolling back — that is the real check.
  4. 4. Read every explanation, even for the answers you got right.

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Check your understanding

  1. 1. What does `getContractFactory` return?

  2. 2. Where should a deploy key live?

  3. 3. Why verify the contract on the explorer?

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