ReferenceError: browser is not defined when i run first test

I have create a sample script, but it can't open chrome browser, so confusing about this issue, i stuck in 7 days, i was try a lot of solution in github or stackoverflow but i cant help so much

Node.js version: 10.15.0

Browser name and version: Chrome 71

Platform name and version: Windows 8.1

Here is my file
package.json

"name": "api_test", "version": "1.0.0", "main": "index.js", "directories": { "test": "wdio" "dependencies": { "selenium-webdriver": "^4.0.0-alpha.1" "devDependencies": { "@types/node": "^10.12.18", "@types/webdriverio": "^5.0.0", "wdio-mocha-framework": "^0.6.4", "wdio-selenium-standalone-service": "0.0.12", "webdriverio": "^5.4.7" "scripts": { "test": "mocha" "keywords": [], "author": "", "license": "ISC", "description": ""

test.conf.js

exports.config = {
    specs: ['./test/openPage.js'],
    hots: 'localhost',
    port: 9515,
    path: '/',
    capabilities: [
            browserName: 'chrome'
    framework: 'mocha',
    mochaOpts:{
        ui: 'bdd',
        timeout: 600000
    logLevel: 'verybose',
openPage.js
describe('api command', function(){
    it('open page', function (){
        browser.url('https://www.google.com');
        browser.pause(600000);
When i run: npm test test.conf.js

->  0 passing (5ms) -> no open chrome no error
When i run: npm test ./test/openPage.js
 api command
    1) open page
  0 passing (15ms)
  1 failing
  1) api command
       open page:
     ReferenceError: browser is not defined
      at Context.<anonymous> (test\openPage.js:3:9)
npm ERR! Test failed.  See above for more details.
I really need help with this, thank you for any infomations

ReferenceError: browser is not defined when i run first test #3439

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ReferenceError: browser is not defined when i run first test #3439

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