code clean

package.json

@@ -29,7 +29,7 @@
     "posttest": "npm run clean && npm run sloc",
     "test:phantomjs": "cross-env LC_ALL=C WECHATY_LOG=info WECHATY_HEAD=phantomjs ava --timeout=10m \"dist/test/*.spec.js\"",
     "test:phantomjs.bak": "cross-env LC_ALL=C WECHATY_LOG=info WECHATY_HEAD=phantomjs ava --timeout=10m \"dist/{src,test}/**/*.spec.js\"",
-    "test:chrome": "cross-env LC_ALL=C WECHATY_LOG=verbose WECHATY_HEAD=chrome ava --concurrency 0 --ext js --timeout=10m \"dist/{src,test}/**/*.spec.js\"",
+    "test:chrome": "cross-env LC_ALL=C WECHATY_LOG=verbose WECHATY_HEAD=chrome ava --concurrency 0 --verbose --ext js --timeout=10m \"dist/{src,test}/**/*.spec.js\"",
     "testdev": "cross-env LC_ALL=C WECHATY_LOG=silly ava --ext ts --serial --verbose --fail-fast --timeout=3m",
     "testdist": "cross-env WECHATY_LOG=SILLY WECHATY_HEAD=chrome ava --ext ts --verbose --fail-fast --timeout=2m",
     "ava": "cross-env LC_ALL=C WECHATY_LOG=verbose ts-node node_modules/.bin/ava \"{src,test}/**/*.spec.js\"",

src/puppet-web/browser-driver.ts

@@ -114,7 +114,7 @@ export class BrowserDriver {
     let err = new Error('unknown')
     let driver: WebDriver|null = null
 
-    while (!driver && ttl--) {
+    while (!driver && ttl-- > 0) {
       log.verbose('PuppetWebBrowserDriver', 'getChromeDriver() with ttl: %d', ttl)
 
       try {