Скачать или смотреть Selenium with Python 1 - What is Selenium? Why Selenium for web automation? Advantages of Automation

Selenium using python
What is Software testing?
Software testing is a process of executing a program or application with the intent of finding the software bugs.

What is Manual Testing?
Testing the application or software again and again manually to find defects in the software according to customer requirements.
Manual Testing is a process of finding out the defects or bugs in a software program. In this method the tester plays an important role of end user and verifies that all the features of the application are working correctly. Here the tester will manually executes test cases without using any automation tools. Without manual testing, the testing process will not be complete and there is a chance of critical functional issues if we less bothered about the manual testing process.

What are Drawbacks of Manual Testing?
Manual Testing requires more time or more resources, some times both: Covering all areas of the Application requires more Tests, creating all possible Test cases, and executing Test cases takes more time
Executing same tests again and again will be time taking process as well as Tedious.
Less Accuracy: Testers may make mistakes, so we cannot expect more accuracy in Manual Testing
Performance testing is impractical in manual testing. Test Tool is mandatory to conduct performance testing
Manual Test Case scope is very limited.
GUI Objects Size difference and Color combinations etc... are not easy to find in Manual Testing.
Not Suitable for Large scale projects and time bounded projects.
For each and every test execution Human user interaction is mandatory.

To Overcome these drawbacks, we will go for Automation....

What is Automation Testing?
Process of using a computer program to execute system or user transactions against an IT system.
This is typically done by automation tool.
Automated testing tools are capable of executing tests, reporting outcomes and comparing results with earlier test runs. Tests carried out with these tools can be run repeatedly, at any time of day.

When Best to go for Automation?
If the system undergoes cycles of re-testing by regression testing this leads to practically executing several thousand test cases which is not only time consuming but monotonous and leading to errors. So, to solve such problems we can go for automation testing.
Automation testing typically used for functional regression testing, performance testing, load testing, network testing and security testing.

Advantages of Automation
 Automation saves lots of time, especially when it comes to regression testing. In regression testing we need to run all test script associate with the change. this is a risk here that due to time constraints we may not run all tests associates to the change which may result in undiscovered defects. These issues can be overcome by automated tests
 Speed: As automated tests are run by tool these are run much faster than human user which adds to the first benefits of saving time
 Repeatability: The same tests can be re-run in exactly the same manner eliminating the risk of human errors such as tester
 Programmable: Tester can program sophisticated tests that brings hidden
 Reusable: Tests can be reused on different versions of software information.
 Increase Coverage: You can build a suite of tests that covers every feature in your application.
 Cost reduction: As the number of resources for regression test are reduced.
 Good ROI(Return on investment).


What is Selenium?
Selenium is a portable software-testing framework for web applications.
Testing done using Selenium tool is usually referred as Selenium Testing and its an API for web browsers….

Selenium is a set of different software tools each with a different approach to supporting test automation.
There are four tools in Selenium
1.Selenium-IDE
2.Selenium-RC
3.Selenium Webdriver
4.Selenium Grid
Most selenium QA Engineers focus on the one or two tools that most meet the needs of their project, however learning all the tools will give you many different options for approaching different test automation problems. The entire suite of tools result in a rich set testing functions specifically graded to the needs of testing of web application of all types.
When Selenium can be useful in Testing?

Features of Selenium
• Open source tool is that performs a very specific task, in which the source code is openly published for use and modification from its original design, free of charge.

• Frequent regression testing.
• Rapid feedback to developers.
• Virtually unlimited iterations of test case execution.
• Support for Agile and extreme development methodologies.
• Disciplined documentation of test cases.
• Customized defect reporting.
• Finding defects missed by manual testing.


Selenium Supported Language
• Java
• C#
• PHP
• Python
• Perl
• Ruby