Migrate from truffle to test-environment (#2007)

* Sketch

* Migrate all tests to test-env

* Finish migration to test-env

* Add config

* Work on GSN tests

* Migrate to newer test-env version and loader syntax

* Add GSN setup

* Finish test-env migration

* Setup coverage using test-env

* Migrate to npm package

* Fix package.json

* Add compile step to CI

* Add comment on coverage setup

* Remove dependency on @truffle/contract

* Fix package-lock merge

* Fix linter errors

* Upgrade test-environment, depend locally on ganche-coverage

* Improve coverage script

* Improve sign.js API

* Move accounts destructuring to describe block

* Switch to prebuilt ethereumjs-vm package

* Upgrade test-enviroment version

* use workspace in circleci config

* remove unnecessary npx

test/drafts/Counters.test.js

@@ -1,10 +1,11 @@
+const { contract } = require('@openzeppelin/test-environment');
 const { expectRevert } = require('@openzeppelin/test-helpers');
 
 const { expect } = require('chai');
 
-const CountersImpl = artifacts.require('CountersImpl');
+const CountersImpl = contract.fromArtifact('CountersImpl');
 
-contract('Counters', function () {
+describe('Counters', function () {
   beforeEach(async function () {
     this.counter = await CountersImpl.new();
   });

test/drafts/ERC1046/ERC20Metadata.test.js

@@ -1,6 +1,7 @@
+const { contract } = require('@openzeppelin/test-environment');
 require('@openzeppelin/test-helpers');
 
-const ERC20MetadataMock = artifacts.require('ERC20MetadataMock');
+const ERC20MetadataMock = contract.fromArtifact('ERC20MetadataMock');
 
 const { expect } = require('chai');
 

test/drafts/ERC20Migrator.test.js

@@ -1,13 +1,17 @@
+const { accounts, contract } = require('@openzeppelin/test-environment');
+
 const { BN, constants, expectRevert } = require('@openzeppelin/test-helpers');
 const { ZERO_ADDRESS } = constants;
 
 const { expect } = require('chai');
 
-const ERC20Mock = artifacts.require('ERC20Mock');
-const ERC20Mintable = artifacts.require('ERC20Mintable');
-const ERC20Migrator = artifacts.require('ERC20Migrator');
+const ERC20Mock = contract.fromArtifact('ERC20Mock');
+const ERC20Mintable = contract.fromArtifact('ERC20Mintable');
+const ERC20Migrator = contract.fromArtifact('ERC20Migrator');
+
+describe('ERC20Migrator', function () {
+  const [ owner ] = accounts;
 
-contract('ERC20Migrator', function ([_, owner, recipient, anotherAccount]) {
   const totalSupply = new BN('200');
 
   it('reverts with a null legacy token address', async function () {

test/drafts/ERC20Snapshot.test.js

@@ -1,9 +1,13 @@
+const { accounts, contract } = require('@openzeppelin/test-environment');
+
 const { BN, expectEvent, expectRevert } = require('@openzeppelin/test-helpers');
-const ERC20SnapshotMock = artifacts.require('ERC20SnapshotMock');
+const ERC20SnapshotMock = contract.fromArtifact('ERC20SnapshotMock');
 
 const { expect } = require('chai');
 
-contract('ERC20Snapshot', function ([_, initialHolder, recipient, other]) {
+describe('ERC20Snapshot', function () {
+  const [ initialHolder, recipient, other ] = accounts;
+
   const initialSupply = new BN(100);
 
   beforeEach(async function () {

test/drafts/SignedSafeMath.test.js

@@ -1,11 +1,13 @@
+const { contract } = require('@openzeppelin/test-environment');
+
 const { BN, constants, expectRevert } = require('@openzeppelin/test-helpers');
 const { MAX_INT256, MIN_INT256 } = constants;
 
 const { expect } = require('chai');
 
-const SignedSafeMathMock = artifacts.require('SignedSafeMathMock');
+const SignedSafeMathMock = contract.fromArtifact('SignedSafeMathMock');
 
-contract('SignedSafeMath', function () {
+describe('SignedSafeMath', function () {
   beforeEach(async function () {
     this.safeMath = await SignedSafeMathMock.new();
   });

test/drafts/Strings.test.js

@@ -1,10 +1,11 @@
+const { contract } = require('@openzeppelin/test-environment');
 const { constants } = require('@openzeppelin/test-helpers');
 
 const { expect } = require('chai');
 
-const StringsMock = artifacts.require('StringsMock');
+const StringsMock = contract.fromArtifact('StringsMock');
 
-contract('Strings', function () {
+describe('Strings', function () {
   beforeEach(async function () {
     this.strings = await StringsMock.new();
   });

test/drafts/TokenVesting.test.js

@@ -1,12 +1,16 @@
+const { accounts, contract } = require('@openzeppelin/test-environment');
+
 const { BN, constants, expectEvent, expectRevert, time } = require('@openzeppelin/test-helpers');
 const { ZERO_ADDRESS } = constants;
 
 const { expect } = require('chai');
 
-const ERC20Mintable = artifacts.require('ERC20Mintable');
-const TokenVesting = artifacts.require('TokenVesting');
+const ERC20Mintable = contract.fromArtifact('ERC20Mintable');
+const TokenVesting = contract.fromArtifact('TokenVesting');
+
+describe('TokenVesting', function () {
+  const [ owner, beneficiary ] = accounts;
 
-contract('TokenVesting', function ([_, owner, beneficiary]) {
   const amount = new BN('1000');
 
   beforeEach(async function () {