add .mocharc.js to make NODE_ENV='test' work

Author: gjf7

packages/neovim/.mocharc.js

@@ -0,0 +1,8 @@
+process.env.NODE_ENV = 'test';
+
+module.exports = {
+  require: ['ts-node/register', 'src/testSetup.ts'],
+  extension: ['ts'],
+  spec: ['src/**/*.test.ts'],
+  exit: true
+}

packages/neovim/package.json

@@ -71,7 +71,7 @@
   "scripts": {
     "doc": "typedoc --out doc --exclude '**/*.test.ts' src",
     "prepublishOnly": "npm run build",
-    "test": "NODE_ENV=test mocha --exit --require ts-node/register --require src/testSetup.ts src/**/*.test.ts",
+    "test": "mocha",
     "test-coverage": "c8 --reporter=json --reporter=html npm test",
     "test-staged": "npm test --bail",
     "test-missing-apis": "npm run build && node scripts/findMissingApi",

packages/neovim/src/testSetup.ts

@@ -1,8 +1,6 @@
 // Global test setup. Runs before each test.
 import { startNvim, stopNvim } from './testUtil';
 
-process.env.NODE_ENV = 'test';
-
 export const mochaHooks = {
   beforeAll: async () => {
     startNvim();

packages/neovim/src/utils/findNvim.ts

@@ -276,7 +276,7 @@ export function findNvim(opt: FindNvimOptions = {}): Readonly<FindNvimResult> {
 
 // eslint-disable-next-line import/no-mutable-exports
 export let exportsForTesting: any;
-// 'NODE_ENV=test' is being set in testSetup.ts
+// .mocharc.js sets NODE_ENV=test.
 if (process.env.NODE_ENV === 'test') {
   // These functions are intentionally not exported. After `nvim` is found, clients can use Nvim's
   // own `vim.version` module, so node-client shouldn't expose a half-baked "semver" implementation.

packages/neovim/src/utils/transport.ts

@@ -14,7 +14,7 @@ import {
 import { Metadata } from '../api/types';
 
 export let exportsForTesting: any; // eslint-disable-line import/no-mutable-exports
-// 'NODE_ENV=test' is being set in testSetup.ts
+// .mocharc.js sets NODE_ENV=test.
 if (process.env.NODE_ENV === 'test') {
   exportsForTesting = {
     onTransportFail: new EventEmitter(),