OpenZeppelin Test Environment

Blazing fast smart contract testing. One-line setup for an awesome testing experience.

Near-instant start up: have your code running in under 2s after typing npm test.
Test runner agnostic – from the familiarity of Mocha, to parallel tests using Jest or Ava!
Non-opinionated: use either @truffle/contract or web3-eth-contract as you see fit.
First class support for the OpenZeppelin Test Helpers.
Highly configurable: from gas limit and initial balance, to complex custom web3 providers.
No global variables, no hacks.

test-environment is the result of our learnings while developing the OpenZeppelin Contracts, combining best practices and the tools we've come to rely on over the years. We think you'll love it!

Overview

Installation

npm install --save-dev @openzeppelin/test-environment

Usage

By including require('@openzeppelin/test-environment') in your test files, a local ganache-powered blockchain with unlocked accounts will be spun up, and all tools configured to work with it.

Here's a quick sample of how using test-environment in a Mocha + Chai setup looks like.

const { accounts, contract } = require('@openzeppelin/test-environment');
const [ owner ] = accounts;

const { expect } = require('chai');

const MyContract = contract.fromArtifact('MyContract'); // Loads a compiled contract

describe('MyContract', function () {
  it('deployer is owner', async function () {
    const myContract = await MyContract.new({ from: owner });
    expect(await myContract.owner()).to.equal(owner);
  });
});

If you're used to truffle test, this probably looks very familiar. Follow our guide on migrating from Truffle to have your project running with test-environment in a breeze!

Note: if you'd rather not rely on truffle contracts and use web3 contract types directly, worry not: you can configure test-environment to use the web3-eth-contract abstraction.

Learn More

Check out Getting Started to use Test Environment in a new project.
If you are currently using truffle test, head instead to Migrating from Truffle.
The Choosing a Test Runner guide will teach you how to use each of the different runners.
For detailed usage information, take a look at the API Reference.

License

Released under the MIT License.