SOFTWARE QA Hint : SELENIUM

Execute Selenium Code on Cloud Virtual Instance/Amazon EC2 and remove dependencies of Local physical Desktops - with same reference we

Install Python 3.7 on Virtual Instance/Amazon EC2 when Python 2.7 already installed

Followed following high-level steps.

Create free tier google Virtual Machine or Amazon EC2 Instance
Make sure you can access same from your Windows Desktop/Laptop

Please refer

Document: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/putty.html

Video: https://www.youtube.com/watch?v=bi7ow5NGC-U&ab_channel=LinuxAcademy

Once able to access Cloud instance Please follow below steps.

Check OS version

OS version will help to search future references because if we execute Ubuntu commands on CentOS - it will not work
For Example: APT vs Yum
Please refer
Document: https://cmdref.net/os/linux/note/centos-vs-rhel

For our case: we will use below command:
Execute below command/s:
cat /etc/os-release

Once OS confirmed as Centos - Check Python is installed or not - By default many Linux virtual instance dependent on python and having python 2.7.5 preinstalled.

Execute below command/s:
python -V or python --version (will give python version as 2.7.5)
Which Python will give location as /usr/bin

Now install python 3.7

Please do not install using - yum install -y python3 - It will install python 3.6*

Please refer:
Document: https://tecadmin.net/install-python-3-7-on-centos/

Now Technical challenges starts
python --version or python3 --version will not give required version

Reason is, Default python path still link to Python2.7
If you will search - Stackoverflow and everyone suggesting to move python location using below commands -

Try adding
Execute below command/s:
export PATH=$PATH:/usr/local/bin/python

This will help to make sure python 3 installed
Execute below command/s:
python3.7 --version

Please do not execute below commands as yum will be stopped.

mv /usr/bin/python2.7 /usr/bin/python_old
mv /usr/local/bin/python3.7 /usr/bin/python
sudo ln -s python3.7 python

First Install PIP and required libraries

Execute below command/s:
Using YUM
sudo yum install epel-release
yum -y update
yum -y install python-pip
pip -V
or Using Curl
curl "https://bootstrap.pypa.io/get-pip.py" -o "get-pip.py"
sudo python get-pip.py
pip -V

Move requiremenet.txt on linux server
Sample requirment.txt (copy everything into notepad, save as requirement.txt)

Execute below command/s:
pip install -Ur requirement.txt

astroid==2.4.2
atomicwrites==1.4.0
attrs==20.3.0
cachetools==4.1.1
certifi==2020.11.8
chardet==3.0.4
colorama==0.4.4
dateutils==0.6.12
docutils==0.14
et-xmlfile==1.0.1
google-api-core==1.23.0
google-api-python-client==1.12.8
google-auth==1.23.0
google-auth-httplib2==0.0.4
google-auth-oauthlib==0.4.2
googleapis-common-protos==1.52.0
httplib2==0.18.1
idna==2.10
importlib-metadata==3.1.0
isort==4.3.21
jdcal==1.4.1
lazy-object-proxy==1.4.3
mccabe==0.6.1
more-itertools==8.6.0
multi-key-dict==2.0.3
numpy==1.19.4
oauth2client==4.1.3
oauthlib==3.1.0
openpyxl==3.0.5
pandas==1.1.4
pbr==5.5.1
pluggy==0.13.1
protobuf==3.14.0
py==1.9.0
pyasn1==0.4.8
pyasn1-modules==0.2.8
pylint==2.3.1
pyserial==3.4
pytest==4.4.0
pytest-html==1.17.0
pytest-metadata==1.11.0
pytest-ordering==0.6
pytest-parallel==0.0.5
python-dateutil==2.8.1
python-jenkins==1.0.0
pytz==2020.4
requests==2.25.0
requests-oauthlib==1.3.0
rsa==4.6
selenium==3.141.0
six==1.15.0
typed-ast==1.4.1
uritemplate==3.0.1
urllib3==1.26.2
wrapt==1.12.1
xlrd==1.2.0
zipp==3.4.0

Now you need to install google chrome and chrome driver on Linux

(As we are using putty) we will not able to launch Chrome and validate UI - we need to validate details using command - mainly Chrome Version:

Execute below command/s:
wget https://dl.google.com/linux/direct/google-chrome-stable_current_x86_64.rpm
sudo yum localinstall google-chrome-stable_current_x86_64.rpm
yum info google-chrome-stable

You also need to install chromedriver:

Execute below command/s:
cd /home/seleniumtest (if folder not created, please create)
wget https://chromedriver.storage.googleapis.com/2.40/chromedriver_linux64.zip
unzip chromedriver_linux64.zip

This will unzip chromedriver into seleniumtest folder

Setup is done so now we can switch to Python3.7.

Execute below command/s:
cd /usr/bin
ls -la | grep "python"
- it will display python2.7 and reference link or python or python2.7 folder with python name and no reference link
- if reference link python -> python2.7 available we need to remove

Execute below command/s:
sudo su
cd /usr/bin
ls -la | grep "python"
rm python (rm: remove symbolic link 'python' ?) will be displayed
type: yes and press enter
ls -la | grep "python"
Symbolic reference link of python removed

Execute below command/s:
mv /usr/bin/python2.7(Few might have folder as python) /usr/bin/python_old
mv /usr/local/bin/python3.7 /usr/bin/python
sudo ln -s python3.7 python

Check python version
python --version - it should be 3.7

Now - Run Selenium Code on Linux using headless Google Chrome

cd /home/seleniumtest (Same location where chromedriver downloaded)
vi abc.py
Press i and paste code
from selenium import webdriver
from selenium.webdriver.chrome.options import Options

options = Options()
options.add_argument('--no-sandbox')
options.add_argument('--disable-dev-shm-usage')
options.add_argument('--headless')
options.add_argument('--disable-gpu')

driver = webdriver.Chrome(executable_path='./chromedriver', chrome_options=options)
driver.get('https://github.com/')
print(driver.title)
driver.quit()
type :wq to write and save abc.py

Execute:
python abc.py
Output -
GitHub: Where the world builds software . Github

Few errors which we resolved during this entire setup

Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/lib/python2.7/site-packages/selenium/webdriver/chrome/webdriver.py", line 73, in __init__ self.service.start() File "/usr/lib/python2.7/site-packages/selenium/webdriver/common/service.py", line 98, in start self.assert_process_still_running() File "/usr/lib/python2.7/site-packages/selenium/webdriver/common/service.py", line 111, in assert_process_still_running % (self.path, return_code) selenium.common.exceptions.WebDriverException: Message: Service /bin/google-chrome unexpectedly exited. Status code was: 1
Downloading packages: File "/usr/libexec/urlgrabber-ext-down", line 28 except OSError, e: ^ SyntaxError: invalid syntax File "/usr/libexec/urlgrabber-ext-down", line 28 except OSError, e: ^ SyntaxError: invalid syntax

import 'genericpath' # <_frozen_importlib_external.SourceFileLoader object at 0x7fe78c85ec10> import 'posixpath' # <_frozen_importlib_external.SourceFileLoader object at 0x7fe78c844dd0>

(Driver info: chromedriver=2.40.565383 ,platform=Linux 3.1

selenium.common.exceptions.WebDriverException:unknown error: DevToolsActivePort file doesn't exist

Sikuli is a robust and powerful tool to automate and tests user interfaces screenshots. The core of Sikuli Script is written in Java, which means you can use Sikuli Script as a standard JAVA library in your program. This article lets you know how to do that.

1. Download and install Sikuli using the self-extracting installer(http://www.sikuli.org/download.html).
Note: Only 32-bit version is provided for using as a standard JAVA library. But SIKULI IDE could run on both 32-bit and 64-bit Windows systems.

2. Create new Java project (use Eclipse as an example):

3. Fill project name and click Finish:

4. Create new class:

5. Fill class name and click Finish:

6. Include sikuli-script.jar, selenium-server-standalone-2.25.0.jar, selenium-java-2.25.0.jar in the CLASSPATH of your Java project.
Get sikuli-script.jar from your Sikuli IDE installation path.

Sikuli Script is packed in a JAR file - sikuli-script.jar. Depending on the operating system you use, you can find the sikuli-script.jar in according places.

Windows, Linux: Sikuli-IDE/sikuli-script.jar
Mac OS X: Sikuli-IDE.app/Contents/Resources/Java/sikuli-script.jar

After adding sikuli-script.jar, selenium-server-standalone-2.25.0.jar, selenium-java-2.25.0.jar as a libraries into your project, the project hierarchy should look like this:

After click OK:

7. After configuring in build path, create and initialize an instance of Screen object.

SIKULI + SELENIUM WEBDRIVER

import org.junit.Test;

import org.openqa.selenium.WebDriver;

import org.openqa.selenium.firefox.FirefoxDriver;

import org.sikuli.script.App;

import org.sikuli.script.FindFailed;

import org.sikuli.script.Pattern;

import org.sikuli.script.Screen;



public class sikuliFirstTest {



@Test

public void functionName() throws FindFailed {

  

// Create a new instance of the Firefox driver

WebDriver driver = new FirefoxDriver();



// And now use this to visit Google

driver.get("http://www.google.com");



//Create and initialize an instance of Screen object   

Screen screen = new Screen();



//Add image path  

Pattern image = new Pattern("C:\\searchButton.png");

   

//Wait 10ms for image 

screen.wait(image, 10);

   

//Click on the image

screen.click(image);

  }

}

Here example using SIKULI without Selenium WebDriver:

import org.junit.Test;

import org.sikuli.script.App;

import org.sikuli.script.FindFailed;

import org.sikuli.script.Pattern;

import org.sikuli.script.Screen;



public class sikuliFirstTest {



@Test

public void functionName() throws FindFailed {



//Open FireFox application with google home page   

App firefox = App.open("c:\\Program Files\\MozillaFirefox\\firefox.exe");



//Create and initialize an instance of Screen object   

Screen screen = new Screen();



//Add image path  

Pattern image = new Pattern("C:\\searchButton.png");

   

//Wait 10ms for image 

screen.wait(image, 10);

   

//Click on the image

screen.click(image);



//Close firefox  

firefox.close();

  }

}

SOFTWARE QA Hint

Wednesday, December 30, 2020

Run Selenium Code on Linux using headless Google Chrome and How Install Python 3.7 on Virtual Instance/Amazon EC2 when Python 2.7 already installed