Use make-promises-safe to catch unhandled rejections in tests

packages/0x.js/package.json

@@ -2,7 +2,7 @@
     "name": "0x.js",
     "version": "0.37.2",
     "engines": {
-        "node" : ">=6.12"
+        "node": ">=6.12"
     },
     "description": "A javascript library for interacting with the 0x protocol",
     "keywords": [
@@ -67,10 +67,10 @@
     "license": "Apache-2.0",
     "devDependencies": {
         "@0xproject/abi-gen": "^0.2.13",
-        "@0xproject/sol-compiler": "^0.4.3",
         "@0xproject/dev-utils": "^0.4.1",
         "@0xproject/migrations": "^0.0.5",
         "@0xproject/monorepo-scripts": "^0.1.19",
+        "@0xproject/sol-compiler": "^0.4.3",
         "@0xproject/tslint-config": "^0.4.17",
         "@types/lodash": "4.14.104",
         "@types/mocha": "^2.2.42",
@@ -83,6 +83,7 @@
         "copyfiles": "^1.2.0",
         "dirty-chai": "^2.0.1",
         "json-loader": "^0.5.4",
+        "make-promises-safe": "^1.1.0",
         "mocha": "^4.0.1",
         "npm-run-all": "^4.1.2",
         "nyc": "^11.0.1",
@@ -100,11 +101,11 @@
         "@0xproject/assert": "^0.2.9",
         "@0xproject/base-contract": "^0.3.1",
         "@0xproject/contract-wrappers": "^0.0.1",
-        "@0xproject/order-watcher": "^0.0.1",
         "@0xproject/order-utils": "^0.0.4",
+        "@0xproject/order-watcher": "^0.0.1",
+        "@0xproject/sol-compiler": "^0.4.3",
         "@0xproject/types": "^0.6.3",
         "@0xproject/typescript-typings": "^0.3.1",
-        "@0xproject/sol-compiler": "^0.4.3",
         "@0xproject/utils": "^0.6.1",
         "@0xproject/web3-wrapper": "^0.6.3",
         "ethers": "^3.0.15",

packages/0x.js/test/0x.js_test.ts

@@ -3,6 +3,7 @@ import { BlockchainLifecycle, devConstants, web3Factory } from '@0xproject/dev-u
 import { BigNumber } from '@0xproject/utils';
 import * as chai from 'chai';
 import * as _ from 'lodash';
+import 'make-promises-safe';
 import 'mocha';
 import * as path from 'path';
 import * as Sinon from 'sinon';

packages/0x.js/test/artifacts_test.ts

@@ -1,5 +1,6 @@
 import { web3Factory } from '@0xproject/dev-utils';
 import * as fs from 'fs';
+import 'make-promises-safe';
 
 import { ZeroEx } from '../src';