TESTING TOOLS QA TRAINING: SELENIUM INTERVIEW QUESTIONS AND ANSWERS.

Question 1: How do you start Selenium RC from command line?Answer:Selenium command line example

Java

// Simple way to start Selenium RC is­

java -jar selenium-server.jar

// Run a suite of Selenese scripts in a browser

java -jar selenium-server.jar -htmlSuite

Question 2: On my machine port 4444 is not free. How do Use another port?

Answer:

// You can specify port while running the selenium server as –

Java -jar selenium-server.jar –port 5555

Question 3: What is selenium server vs selenium hub?

Answer:

Selenium server is a standalone application for using a single server as a test node. Selenium hub acts as a proxy in front of one or more Selenium node instances. A hub + node(s) is called a Selenium grid. Running Selenium server is similar to creating a Selenium grid from a hub and a single node on the same host.

Question 4: How do you connect to Data base from selenium?

Answer:

Connecting to database is language dependent. In the below example, we assume that Java is being used.

A Connection object represents a connection with a database. When we connect to a database by using connection method, we create a Connection Object, which represents the connection to the database. An application may have one or more than one connections with a single database or many connections with different databases.

We can use the Connection object for the following things:

1). It creates the Statement, PreparedStatement and CallableStatement objects for executing the SQL statements.

2). It helps us to Commit or roll back a jdbc transactionn.

3). If you want to know about the database or data source to which you are connected then the Connection object gathers information about the database or data source by the use of DatabaseMetaData.

4). It helps us to close the data source. The Connection.isClosed() method returns true only if the Connection.close() has been called. This method is used to close all the connection.

Firstly we need to establish the connection with the database. This is done by using the method DriverManager.getConnection(). This method takes a string containing a URL. The DriverManager class, attempts to locate a driver that can connect to the database represented by the string URL. Whenever the getConnection() method is called the DriverManager class checks the list of all registered Driver classes that can connect to the database specified in the URL.

Syntax:

String url = "jdbc: odbc: makeConnection";

Connection con = DriverManager.getConnection(url, "userID", "password");

Question 5: What locators are available in Selenium RC?

Answer:

ID
Name
CSS (Cascade style sheet)
XPATH (Relative xpath and Absolute xpath)
Dom

Question 6: How do you verify an object present in multiple pages?Answer:

Check on each page assertTrue(selenium.isElementPresent(locator));

Question 7: What is the difference between single and double slash in xpath?

Answer:

If xpath starts selection from the document node, it’ll allow you to create ‘absolute’ path expressions.

e.g. “/html/body/p” matches all the paragraph elements

If xpath starts selection matching anywhere in the document, then it’ll allow you to create ‘relative’ path expressions.

e.g. “//p” matches all the paragraph elements

Question 8: Did you write any User Extensions?

Answer:

User extensions are stored in a separate file that we will tell Selenium IDE or Selenium RC to use. Inside there the new function will be written in JavaScript.

Because Selenium’s core is developed in JavaScript, creating an extension follows the standard rules for prototypal languages. To create an extension, we create a function in the following design pattern.

// sample

Selenium.prototype.doFunctionName = function(){

}

The “do” in front of the function name tells Selenium that this function can be called as a command for a step instead of an internal or private function.

Question 9: How do you verify the presence of an element after the successful page loading?

Answer:

It can be achieved with the following line of code.

Just mention some time value to check the element (in seconds) like:

 public void waitForElementPresent(String element, int timeout)

   throws Exception {

  for (int second = 0;; second++) {

   if (second >= timeout)

    fail("Timeout. Unable to find the Specified element" + element);

   try {

    if (selenium.isElementPresent(element))

     break;

   } catch (Exception e) {

   }

   Thread.sleep(1000);

  }

 }

Question 10: How do you describe Selenium Grid?

Answer:

Selenium Grid is a tool that dramatically speeds up functional testing of web-apps by leveraging your existing computing infrastructure. It allows you to easily run multiple tests in parallel, on multiple machines, in an heterogeneous environment.

Based on the excellent Selenium web testing tool, Selenium Grid allows you to run multiple instances of Selenium Remote Control in parallel. Even better, it makes all these Selenium Remote Controls appear as a single one, so your tests do not have to worry about the actual infrastructure. Selenium Grid cuts down on the time required to run a Selenium test suite to a fraction of the time that a single instance of Selenium instance would take to run.

Question 11: How to start the selenium server from your language class?

Answer:

try {

seleniumServer = new SeleniumServer();

seleniumServer.start();

} catch (Exception e) {

e.printStackTrace();

}

Question 12: What are the verification points available in Selenium?

Answer:

There are largely three types of verification points available with Selenium –

Check for page title
Check for certain text
Check for certain element (text box, drop down, table etc.)

Question 13: What is XPath? When would I have to use XPath in Selenium?

Answer:

XPath is a way to navigate in xml document and this can be used to identify elements in a web page. You may have to use XPath when there is no name/id associated with element on page or only partial part of name/ide is constant.

Direct child is denoted with – /

Relative child is denoted with – //

Id, class, names can also be used with XPath –

//input[@name=’q’]
//input[@id=’lst-ib’]
//input[@class=’ lst’]

If only part of id/name/class is constant than “contains” can be used as –

//input[contains(@id,’lst-ib’)]

Question 14: What is CSS location strategy in Selenium?

Answer:

CSS location strategy can be used with Selenium to locate elements, it works using cascade style sheet location methods in which –

Direct child is denoted with – (a space)

Relative child is denoted with – >

Id, class, names can also be used with XPath –

css=input[name=’q’]
css=input[id=’lst-ib’] or input#lst-ib
css=input[class=’ lst’] or input.lst

If only part of id/name/class is constant than “contains” can be used as –

css=input[id*=’ lst-ib ‘)]

Element location strategy using inner text

css = a:contains(‘log out’)

Question 15: There is id, name, XPath, CSS locator, which one should I use?

Answer:

If there are unique names or identifier available then they should be used instead of XPath and CSS locators. If not then css locators should be given preference as their evaluation is faster than XPath in most modern browsers.

Question 16: What is the mechanism to handle multiple popups in selenium?

Answer:

Multiple popups can be handled by using the command getWindowHandles().

Then store all the window names into Set<String> variable and transform it into an array.

Next by using the array index, you can navigate to specific window by using

driver.switchTo().window(ArrayIndex);

Question 17: How do you handle Ajax controls using selenium?

Answer:

Let’s consider an example. Say the google test box which is an ajax control and when we enter some text into it, then it displays the auto suggested values.

To work with such controls, you need to capture all the suggested values in a string after entering the value in textbox. Then just split the string and take the values.

WEBDRIVER INTERVIEW QUESTIONS AND ANSWERS.

Question 18: What are the advantages of Selenium Web driver over Selenium RC?

Answer:

Selenium RC’s architecture is quite complicated while WebDriver’s architecture is simpler than Selenium RC’s.

Though Selenium RC is slower since it uses an additional JavaScript program called Selenium Core. On the contrary, WebDriver is faster than Selenium RC since it speaks directly to the browser and uses browser’s own engine to control it.

Selenium Core, just like other JavaScript codes, can access disabled elements. Web Driver interacts with page elements in a more realistic way.

Selenium RC’s API set is already evolved but contains redundancies and often confusing commands. WebDriver APIs are simpler and do not contain any redundant or confusing commands.

Selenium RC cannot support the headless HtmlUnit browser. It needs a real, visible browser to operate on. Web Driver can support the headless HtmlUnit browser.

Selenium RC has built-in test result generator and it automatically generates an HTML file of test results. Web Driver has no built-in command that automatically generates a Test Results File.

Question 19: State any difference between “GET” and “NAVIGATE”?

Answer:

Get method will get a page to load or get page source or get text that’s all. Whereas navigate will guide through the history like refresh, back, forward. For example if we want to move forward and do some functionality and back to the home page. This can be achieved through navigate() method only. driver.get() will wait till the whole page gets loaded and driver.navigate() will just redirect to that page and will not wait.

Question 20: How is the implicit Wait different from Explicit wait?

Implicit Wait sets internally a timeout that will be used for all consecutive Web Element searches. It will try lookup the element again and again for the specified amount of time before throwing a NoSuchElementException if the element could not have been found. It does only this and can’t be forced into anything else – it waits for elements to show up.

Explicit Wait or just Wait is a one-timer used by you for a particular search. It is more extendible in the means that you can set it up to wait for any condition you might like. Usually, you can use some of the prebuilt Expected Conditions to wait for elements to become clickable, visible, invisible, etc., or just write your own condition that suits your needs.

Question 21: How to Handle Alerts/Popups in Selenium WebDriver?

Answer:

There are two types of alerts which are commonly referred–

Windows based alert pop ups
Web based alert pop ups

Web based alert pop ups.

WebDriver offers the users with a very efficient way to handle these pop ups using Alert interface.
void dismiss() – The dismiss() method clicks on the “Cancel” button as soon as the pop up window appears.
void accept() – The accept() method clicks on the “Ok” button as soon as the pop up window appears.
String getText() – The getText() method returns the text displayed on the alert box.
void sendKeys(String stringToSend) – The sendKeys() method enters the specified string pattern into the alert box.

Windows based alert pop ups.

Handling window based pop-ups have always been a little tricky as we know Selenium is an automation testing tool which supports only web application testing, that means, it doesn’t support windows based applications and window alert is one of them.

Robot class is a java based utility which emulates the keyboard and mouse actions and can be effectively used to handling window based pop up with the help of keyboard events.
The keyPress and keyRelease methods simulate the user pressing and releasing a certain key on the keyboard respectively.

Question 22: How to take a screenshot with Selenium WebDriver?Answer:

Import org.apache.commons.io.FileUtils;

WebDriver driver = new FirefoxDriver();

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

File scrFile = ((TakesScreenshot)driver).getScreenshotAs(OutputType.FILE);

// Now you can do whatever you need to do with it, for example copy somewhere

FileUtils.copyFile(scrFile, new File("c:\\tmp\\screenshot.png"));

Question 23: How to address SSL Certificate issue in Firefox with WebDriver (or) how do you manage the secured connection error in HTTPS?

Answer:

FirefoxProfile profile = new FirefoxProfile();

profile.setAcceptUntrustedCertificates(true);

profile.setAssumeUntrustedCertificateIssuer(false);

driver=new FirefoxDriver(profile);

Question 24: How to handle SSL certification issue in IE?

Answer:

// Add the below command after opening the browser.

<strong>driver.navigate().to(“javascript:document.getElementById(‘overridelink’).click()”);</strong>

Question 25: What are the available locators in Selenium WebDriver?

Answer:

ID,
Name,
CSS,
XPath,
Classname,
TagName,
LinkText, and
Partial Link Text.

Question 26: How to handle AJAX controls in WebDriver?

Answer:

AJAX stands for Asynchronous JavaScript and XML. It does not rely on the extra overhead of opening and closing tags that is needed to create valid XML. Most of the time WebDriver automatically handle the Ajax controls and calls/ Incase if it is not able to handle, you can follow the below way to handle.

//Waiting for Ajax Control

WebElement AjaxElement = (new WebDriverWait(driver, 10)).until(ExpectedConditions.presenceOfElementLocated(By. &lt;locatorType&gt;("&lt;locator Value&gt;")));

Question 27: How to Mouse over a submenu item of header menu?

Answer:

With the actions object you should first move the menu title, and then move to the popup menu item and click it. Don’t forget to call actions.perform() at the end. Here’s some sample Java code:

Actions actions = new Actions(driver);

WebElement menuHoverLink = driver.findElement(By.linkText("Menu heading"));

actions.moveToElement(menuHoverLink);

WebElement subLink = driver.findElement(By.cssSelector("#headerMenu .subLink"));

actions.moveToElement(subLink);

actions.click();

actions.perform();

GENERAL FRAMEWORK INTERVIEW QUESTIONS AND ANSWERS.

Question 28: Can you broadly classify TDD, BDD and DDD frameworks and What’s the Difference?

Answer:

You would have heard of all these acronyms buzzing all around. Here I’ll briefly explain them and tell how exactly they will help in the system test life cycle.

TDD – Test Driven Development.

It’s also called test-driven design, is a method of software development in which unit testing is repeatedly done on source code. Write your tests watch it fails and then refactor it. The concept is we write these tests to check if the code we wrote works fine. After each test, refactoring is done and then the same or a similar test is performed again. The process is iterated as many times as necessary until each unit is functionally working as expected. TDD was introduced first by XP. I believe I have explained enough in simple terms.

BDD – Behavior Driven Development.

Behavior-driven development combines the general techniques and principles of TDD with ideas from domain-driven design. Its purpose is to help the folks devising the system (i.e. the developer) identify appropriate tests to write–that is, tests that reflect the behavior desired by the stakeholders.

DDD-Domain Driven Development.

DDD is about mapping business domain concepts into software artifacts. A DDD framework offers following benefits:

Helps the team to create a common model, between the business and IT stakeholders
The model is modular, extensible and easy to maintain as the design reflects the business model.
It improves the re-usability and testability of the business domain objects.

Question 29: What is Data driven framework & Keyword Driven?Answer:Data driven framework.

In this framework test case logic resides in test Scripts. Test Data is separated and kept outside the Test Scripts. Test Data is read from the external files (Excel File) and are loaded into the variables inside the Test Script. Variables are used both for Input values and for Verification values.

Keyword Driven.

The keyword/table driven framework requires the development of data tables and keywords. They are independent of the test automation tool used to execute them. Tests can be designed with or without the Application. In a keyword-driven test, the functionality of the Application-under-test is documented in a table as well as in step-by-step instructions for each test.

Question 30: Explain the advantages of TestNG over Junit?

Answer:

Advantages of TestNG over Junit.

In Junit we have to declare @BeforeClass and @AfterClass. It is a constraint Junit where as in TestNG there is no constraint like this.
Additional Levels of setUp/tearDown level are available in TestNG.
1. @ Before/AfterSuite
2. @Before/AfterTest and
3. @Before/AfterGroup
There is no need to extend any class in TestNG.
There is no method name constraint in TestNG as in Junit.
In TestNG we can tell the test that one method is dependent on another method whereas in Junit this is not possible.
Grouping of test cases is available in TestNG whereas the same is not available in Junit. Execution can be done based on Groups. For example, if you have defined many cases and segregated them by defining 2 groups as Sanity and Regression. And if you only want to execute the “Sanity” cases then just tell TestNG to execute the “Sanity”. TestNG will automatically execute the cases belonging to the “Sanity” group.
Also TestNG supports parallel test case execution.

Question 31: What are the different Parameters for @Test annotation?Answer:

Parameters are keywords that modify the annotation’s function.

Question 32: Can we run group of test cases using TestNG?

Answer:

Test cases in group using TestNG will be executed with the below options.

If you want to execute the test cases based on one of the group like regression test or smoke test-

@Test(groups = {“regressiontest”, “smoketest”})

Question 33: Which web driver implementation is the fastest?

Answer:

HTMLUnitDriver. Simple reason is HTMLUnitDriver does not execute tests on browser but use plain http request-response. It is far quicker than launching a browser and executing tests.

Question 34: Is it possible to use Selenium RC API with Selenium 2.0?

Answer:

You can emulate Selenium 1.0 API with Selenium 2.0. But not all of the Selenium 1.0 methods are supported. To achieve this you need to get Selenium instance from WebDriver and use Selenium methods. Method executions might also be slower while simulating Selenium 1.0 with in Selenium 2.0.

Question 35: How do I use Selenium Grid while using Java, .Net or Ruby?

Answer:

With java you can take advantage of parallel testing capabilities of TestNG to drive your Selenium grid tests.
With .Net you can use “Gallio” to execute your tests in parallel.
With Ruby you can use “DeepTest” to distribute your tests.

SELENIUM INTERVIEW QUESTIONS AND ANSWERS.

Question 1: How do you start Selenium RC from command line?Answer:Selenium command line example Java

Question 1: How do you start Selenium RC from command line?Answer:Selenium command line example

Java