use pretest instead of preinstall in package.json (#1043)

* cherry pick for pretest fix

* put pretest target to test_setup.sh

* fix conflict

* cherry pick for get_chromedriver.sh

* add some sleep to wait download to finish

* use node.js stable

* use npm test target

scripts/get_chromedriver.sh

@@ -7,6 +7,10 @@ fi
 
 if [[ $os_name == 'Linux' ]]; then
   cd chromedriver  && curl -L https://chromedriver.storage.googleapis.com/2.29/chromedriver_linux64.zip > tmp.zip &&  unzip -o tmp.zip && rm tmp.zip 
+  # wait until download finish
+  sleep 5
 elif [[ $os_name == 'Darwin' ]]; then
   cd chromedriver  &&  curl -L https://chromedriver.storage.googleapis.com/2.29/chromedriver_mac64.zip  | tar xz 
+  # wait until download finish
+  sleep 5
 fi

scripts/get_geckdriver.sh

@@ -2,6 +2,8 @@
 os_name=`uname`
 if [[ $os_name == 'Linux' ]]; then
   cd ../ && curl -L https://github.com/mozilla/geckodriver/releases/download/v0.11.1/geckodriver-v0.11.1-linux64.tar.gz | tar xz
+  sleep 5
 elif [[ $os_name == 'Darwin' ]]; then
   cd ../ &&  curl -L https://github.com/mozilla/geckodriver/releases/download/v0.11.1/geckodriver-v0.11.1-macos.tar.gz | tar xz
+  sleep 5
 fi

scripts/get_selenium.sh

@@ -8,6 +8,7 @@ fi
   
 if [ ! -f $DIR/$FILE ]; then
   cd $DIR  && curl -O http://selenium-release.storage.googleapis.com/3.0/selenium-server-standalone-3.0.1.jar
+  sleep 5
 fi
    
 	

scripts/test_setup.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+EXIT_STATUS=0
+
+function check_command {
+    "$@"
+    local STATUS=$?
+    if [ $STATUS -ne 0 ]; then
+      echo "error with $1 ($STATUS)" >&2
+      EXIT_STATUS=$STATUS
+      fi
+   }
+
+check_command scripts/get_geckdriver.sh
+sleep 5
+check_command scripts/get_selenium.sh 
+sleep 5
+check_command scripts/get_chromedriver.sh 
+sleep 5
+check_command scripts/selenium_connect.sh 
+sleep 3
+exit $EXIT_STATUS