Selenium Concepts


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Selenium Concepts

  1. 1. Selenium ConceptsBy Swati Bansal
  2. 2. Agenda• What is Automation Testing?• Getting Familiar with ‘Selenium’.• Selenese – Heart Of Selenium• Digging Into Selenium Components.• Record with Selenium IDE• Code with Selenium RC.• Integrate with Junit Framework – A Visual delight!• Scale with Selenium Grid• Myths and Realities• Where are we heading To??• Open House!!
  3. 3. The Testing Process: Automation Testing & Manual Testing!!• Manual Testing – is • Automation testing - is defined as developing defined as developing and executing tests that and executing tests that rely primarily on direct can run unattended, human interaction comparing the actual to throughout the entire test expected results and case, especially in terms logging status. of evaluating correctness and ascertaining test status.
  4. 4. Win-Win With Automation!• Virtually unlimited iterations of test case execution.• Reduces effort spent in regressing old features.• Emulate exact user behaviors thus verifies an end to end business process. This gives us more confidence in the quality of the application.• Catch Regressions in frequently changing code and mainstream scenarios.• Aids in testing a large test matrix.• Disciplined documentation of test cases.
  5. 5. Some Myths n Realities About Test Automation!!• Myth: Automation replaces testers. Reality: Manual Testing can never be eliminated.• Myth: Automation training is a lengthy process. Reality: Learning curve can be reduced by following a correct methodology..• Myth: Automation tool is difficult to use. Reality: With adequate training the testers can be easily migrated to any new testing tool.• Myth: A single tester can easily perform a dual role of manual and automation. Reality: A set of resources dedicated only to test automation is imperative for avoiding dilemma situations.
  6. 6. All About Selenium!!
  7. 7. Selenium...• Is a suite of tools to automate web application testing.• Tests run directly in a browser, just as real users do.• Works by simulating user actions such as mouse clicks and key presses.• Runs in many browsers and operating systems.• Can be controlled by many programming languages and testing frameworks.
  8. 8. Selenium Tests..• Browser compatibility testing. – Test your application to see if it works correctly on different browsers and operating systems. The same script can run on any supported Selenium platform.• System functional testing. – Create regression tests to verify application functionality and user acceptance.
  9. 9. Selenese – Heart of Selenium!• Selenium commands, aka selenese, are the set of commands that run your tests.• Selenese commands consists of: • Actions • Accessors • Assertions • Element Locators • Patterns• Each command call is one line in the test table of the form:
  10. 10. Selenese Components – Actions!• Actions are commands that generally manipulate the state of the application. They do things like "click this link" and "select that option". If an Action fails, or has an error, the execution of the current test is stopped. Examples of Actions include: • check - check a checkbox • click - click a link, button, image, etc • open - opens a URL in the browser • select - selects a value from a drop-down • submit - submits a form • type - types a value in to a textfield/textarea
  11. 11. Selenese Component – Assertions!• Assertions verify that the state of the application conforms to what is expected.• All Selenium Assertions can be used in 3 modes: "assert", "verify", and "waitFor“.• Examples include "make sure the page title is X" and "verify that this checkbox is checked".• assertTrue, assertEquals, waitForPageToLoad, verifyTextPresent.
  12. 12. Selenium Component – Element Locators!• Element Locators tell Selenium which HTML element a command refers to.• Many commands require an Element Locator as the "target" attribute.• Element Locators primarily fall under 3 categories: identifier, dom, xpath.• Examples: – Identifier: sel.type(“<textFieldId>”, “Enter Some Text”); – Dom:“document.forms[myForm].myDropdown”, “label=Select This Item”); – XPATH:“//img[@alt=The image alt text] “);
  13. 13. Selenese Component – Patterns!• Patterns are used for various reasons, e.g. to specify the expected value of an input field, or identify a select option.• Selenium supports various types of patterns.• Examples of Patterns include glob, regexp, exact.
  14. 14. Selenium IDE Selenium RC Flavors Of Selenium! Selenium Grid
  15. 15. Selenium IDE
  16. 16. Selenium IDE – The Recording Tool!• Selenium-IDE is the Integrated Development Environment for building Selenium test cases.• Firefox plug-in that helps with recording Selenium scripts. Keeps account of user actions as they are performed and stores them as a reusable script to play back.• Recorded script are shown in easily readable table format in IDE.• Key feature: Record  Traces what the user does  Identifies clicks, key selections  Generates script to re-enact what is recorded
  17. 17. Live Demo Of IDE!
  18. 18. IDE Striking features  Record, edit, and debug tests. Intelligent field selection uses IDs, names, or XPath as needed. Uses Base URL to Run Test Cases in Different Domains. Can export tests in HTML, Java, Ruby, and more. Execute Selenium-IDE Tests on Different Browsers using Selenium RC.
  19. 19. What IDE Does Not Have? • Selenium-IDE is a Firefox only add-on. Dependency on Selenium RC to run against other browsers.• Scripts written using IDE follow a linear execution and lack any programming logic.• Difficulty in automating scenarios like: – Performing search multiple times (iteration logic). – Data Driven Testing (read different data set from external files each time). – Handling for unexpected behaviors like element not found (Error Handling) – Registration process where in registered email address is to be retrieved from database. (Database Interactins)
  20. 20. Selenium RC
  21. 21. Selenium RC – The Code Master!• Selenium Remote Control (RC) is :  a test tool that allows you to write automated web application UI tests  in any high level programming language  against any HTTP website  using any mainstream JavaScript-enabled browser.• While leveraging the full power of programming languages (iterations, conditional logic, error recovery), the tests can be written for virtually anything like read and write external files, make queries to a database, send emails with test reports and so on..
  22. 22. RC Architecture!• RC Components include: The Selenium Server Client Libraries
  23. 23. RC Component - Selenium• Same Origin Policy: A site’s content can never be accessible by a script from other site. This policy Server implies that Selenium Core (JavaScript program, a set of JavaScript functions, which interprets and executes Selenium commands using the browser’s built-in JavaScript interpreter) must be placed in the same origin as the AUT i.e. the same url.• Selenium RC Server is an alternative to allow testers to use Selenium to test sites without deploying their JS code. Hence is a solution to XSS (Cross Site Scripting and security concerns).• The Selenium Server acts as a client-configured HTTP proxy, that stands in between the browser and the AUT: – Client Configured: The client browser is launched with a configuration profile that has set localhost:4444 as HTTP proxy such that any HTTP request/response will pass through the Selenium Server. – HTTP Proxy: Acts as a web server that delivers the AUT to the browser. Being a proxy gives it the ability to mask the whole AUT under a fictional URL (embedding Selenium Core and its Java Script tests, delivering them as if they are coming from the same origin.)
  24. 24. RC Component - Client Libraries!• A Selenium client library provides a programming interface, i.e., a set of functions, which run Selenium commands from your program.• It takes a Selenium command and passes it to the Selenium Server for processing a specific action or test against the AUT.• It then receives the result of that command and passes it back to the test program.• Selenium-IDE can directly translate its Selenium commands into a client-driver’s API function calls.• Client libraries are available in all of: HTML, Java, C#, Perl, PHP, Python, and Ruby.
  25. 25. What happens When A Test Runs (I)
  26. 26. What happens When A Test Runs (II)• The client/driver establishes a connection with the selenium-RC server.• Selenium-RC server launches a browser with an URL that will load Selenium-Core in the web page.• Selenium-Core gets the first instruction from the client/driver (via another HTTP request made to the Selenium-RC Server).• Selenium-Core acts on that first instruction, typically opening a page of the AUT.• The browser receives the open request and asks for the website’s content to the Selenium-RC server (set as the HTTP proxy for the browser to use).• Selenium-RC server communicates with the Web server asking for the page and once it receives it, it sends the page to the browser masking the origin to look like the page comes from the same server as Selenium-Core (this allows Selenium-Core to comply with the Same Origin Policy).• The browser receives the web page and renders it in the window reserved for it.
  27. 27. Integrate With JUNIT Framework - Lets See Ourselves!• Once you’ve chosen a language to work with, you simply need to:  Install the Selenium-RC Server.  Set up a programming project using a language specific client driver.• Here we rely on Java’s JUNIT framework to see it all working.
  28. 28. Selenium + Junit Framework – A Demo!
  29. 29. Issues With Selenium RC?? • The Selenium remote control is quite slow at driving the browser.• You can only run a limited number of concurrent tests on the same remote control before seriously impacting its stability.• Automation of pages involving AJAX is tedious.• XPATH heavy, sensitive to design change.
  30. 30. Selenium Grid
  31. 31. Selenium Grid – Scale It Up!• Run your tests in parallel heterogeneous environments.• Dramatically speeds up end-to-end web testing.• Distribute your tests on multiple machines.
  32. 32. The Grid Layout!!
  33. 33. Lets Revise What We Studied!! 
  34. 34. What Selenium has to Offer!• All flexible.• Customize Your Test Automation.• All Extensible.• Open Source project• Free Of Cost!
  35. 35. References To Refer!• : The complete encyclopedia to Selenium.• : The RC API documentation•• :Logging Selenium• :Test Design Considerations and Common Errors.•• :The grid help.
  36. 36. Open House!!