test(twconf): Add testcase for emmit error on pass invalid type in co…

…nfig rule position.

src/index.test.js

@@ -16,7 +16,6 @@ describe('twconfig main tests', () => {
 
  it('simple smoke test', () => {
  expect(() => {
- // eslint-disable-next-line no-new
  const conf = new TwConf({
  'database.mongodb.hostname': {
  comment: 'hostname of mongodb',
@@ -37,13 +36,20 @@ describe('twconfig main tests', () => {
  }).not.to.throw();
  });
 
+ it('throw error on invalid config rule type', () => {
+ expect(() => {
+ // eslint-disable-next-line no-new
+ new TwConf({ 'database.mongodb.hostname': 'invalid value' });
+ }).to.be.throws('Config rule must be an object');
+ });
+
+
  it('splitter', () => {
  process.env = {
  NODE_ENV: 'production',
  };
 
  expect(() => {
- // eslint-disable-next-line no-new
  const conf = new TwConf({
  nodeEnv: {
  comment: 'env mode',