Tutorial #33 – Selenium Interview Questions and Answers

AlexQin

Q #30) What is the difference between driver.close() and driver.quit command?

close(): WebDriver’s close() method closes the web browser window that the user is currently working on or we can also say the window that is being currently accessed by the WebDriver. The command neither requires any parameter nor does is return any value.

quit(): Unlike close() method, quit() method closes down all the windows that the program has opened. Same as close() method, the command neither requires any parameter nor does is return any value.

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Q #31) Can Selenium handle windows based pop up?

Selenium is an automation testing tool which supports only web application testing. Therefore, windows pop up cannot be handled using Selenium.

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Q #32) How can we handle web based pop up?

WebDriver offers the users with a very efficient way to handle these pop ups using Alert interface. There are the four methods that we would be using along with the Alert interface.

• void dismiss() – The accept() 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.
  

Syntax:
// accepting javascript alert
                Alert alert = driver.switchTo().alert();
alert.accept();

AlexQin

Q #33) How can we handle windows based pop up?

Selenium is an automation testing tool which supports only web application testing, that means, it doesn’t support testing of windows based applications. However Selenium alone can’t help the situation but along with some third party intervention, this problem can be overcome. There are several third party tools available for handling window based pop ups along with the selenium like AutoIT, Robot class etc.

AlexQin

Q #34) How to assert title of the web page?

//verify the title of the web page
assertTrue(“The title of the window is incorrect.”,driver.getTitle().equals(“Title of the page”));

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Q #35) How to mouse hover on a web element using WebDriver?

WebDriver offers a wide range of interaction utilities that the user can exploit to automate mouse and keyboard events. Action Interface is one such utility which simulates the single user interactions.

Thus, In the following scenario, we have used Action Interface to mouse hover on a drop down which then opens a list of options.

Sample Code:

1. // Instantiating Action Interface
   
2. Actions actions=new Actions(driver);
   
3. // howering on the dropdown
   
4. actions.moveToElement(driver.findElement(By.id("id of the dropdown"))).perform();
   
5. // Clicking on one of the items in the list options
   
6. WebElement subLinkOption=driver.findElement(By.id("id of the sub link"));
   
7. subLinkOption.click();

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AlexQin

Q #36) How to retrieve css properties of an element?

The values of the css properties can be retrieved using a get() method:

Syntax:
driver.findElement(By.id(“id“)).getCssValue(“name of css attribute”);
driver.findElement(By.id(“id“)).getCssValue(“font-size”);

AlexQin

Q #37) How to capture screenshot in WebDriver?

1. import org.junit.After;
   
2. import org.junit.Before;
   
3. import org.junit.Test;
   
4. import java.io.File;
   
5. import java.io.IOException;
   
6. import org.apache.commons.io.FileUtils;
   
7. import org.openqa.selenium.OutputType;
   
8. import org.openqa.selenium.TakesScreenshot;
   
9. import org.openqa.selenium.WebDriver;
   
10. import org.openqa.selenium.firefox.FirefoxDriver;
    
11. 
    
12. public class CaptureScreenshot {
    
13. WebDriver driver;
    
14. @Before
    
15. public void setUp() throws Exception {
    
16. driver = new FirefoxDriver();
    
17. driver.get("https://google.com");
    
18. }
    
19. @After
    
20. public void tearDown() throws Exception {
    
21. driver.quit();
    
22. }
    
23. 
    
24.      @Test
    
25. public void test() throws IOException {
    
26. // Code to capture the screenshot
    
27. File scrFile = ((TakesScreenshot)driver).getScreenshotAs(OutputType.FILE);
    
28. // Code to copy the screenshot in the desired location
    
29. FileUtils.copyFile(scrFile, new File("C:\\CaptureScreenshot\\google.jpg"));                  
    
30. }
    
31. }

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AlexQin

Q #38) What is Junit?

Junit is a unit testing framework introduced by Apache. Junit is based on Java.

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Q #39) What are Junit annotations?

Following are the Junit Annotations:

• @Test: Annotation lets the system know that the method annotated as @Test is a test method. There can be multiple test methods in a single test script.
• @Before: Method annotated as @Before lets the system know that this method shall be executed every time before each of the test method.
• @After: Method annotated as @After lets the system know that this method shall be executed every time after each of the test method.
• @BeforeClass: Method annotated as @BeforeClass lets the system know that this method shall be executed once before any of the test method.
• @AfterClass: Method annotated as @AfterClass lets the system know that this method shall be executed once after any of the test method.
• @Ignore: Method annotated as @Ignore lets the system know that this method shall not be executed.