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/payment/escrow/ConditionalEscrow.test.js

@@ -1,9 +1,13 @@
+const { accounts, contract } = require('@openzeppelin/test-environment');
+
 const { ether, expectRevert } = require('@openzeppelin/test-helpers');
 const { shouldBehaveLikeEscrow } = require('./Escrow.behavior');
 
-const ConditionalEscrowMock = artifacts.require('ConditionalEscrowMock');
+const ConditionalEscrowMock = contract.fromArtifact('ConditionalEscrowMock');
+
+describe('ConditionalEscrow', function () {
+  const [ owner, payee, ...otherAccounts ] = accounts;
 
-contract('ConditionalEscrow', function ([_, owner, payee, ...otherAccounts]) {
   beforeEach(async function () {
     this.escrow = await ConditionalEscrowMock.new({ from: owner });
   });

test/payment/escrow/Escrow.test.js

@@ -1,9 +1,13 @@
+const { accounts, contract } = require('@openzeppelin/test-environment');
+
 require('@openzeppelin/test-helpers');
 const { shouldBehaveLikeEscrow } = require('./Escrow.behavior');
 
-const Escrow = artifacts.require('Escrow');
+const Escrow = contract.fromArtifact('Escrow');
+
+describe('Escrow', function () {
+  const [ primary, ...otherAccounts ] = accounts;
 
-contract('Escrow', function ([_, primary, ...otherAccounts]) {
   beforeEach(async function () {
     this.escrow = await Escrow.new({ from: primary });
   });

test/payment/escrow/RefundEscrow.test.js

@@ -1,11 +1,15 @@
+const { accounts, contract } = require('@openzeppelin/test-environment');
+
 const { balance, constants, ether, expectEvent, expectRevert } = require('@openzeppelin/test-helpers');
 const { ZERO_ADDRESS } = constants;
 
 const { expect } = require('chai');
 
-const RefundEscrow = artifacts.require('RefundEscrow');
+const RefundEscrow = contract.fromArtifact('RefundEscrow');
+
+describe('RefundEscrow', function () {
+  const [ primary, beneficiary, refundee1, refundee2 ] = accounts;
 
-contract('RefundEscrow', function ([_, primary, beneficiary, refundee1, refundee2]) {
   const amount = ether('54');
   const refundees = [refundee1, refundee2];