Tech Mahindra QA Automation Engineer Interview Questions and Answers

A constructor is a special type of method in a class that is automatically called when an object of that class is created.

• Constructors have the same name as the class they belong to

• They are used to initialize the object's state or perform any necessary setup

• Constructors can have parameters to customize the initialization process

• Example: public class Car { public Car(String color) { this.color = color; } }

Yes, a static method can be overridden in Java using the concept of method hiding.

• In Java, static methods cannot be overridden in the traditional sense like instance methods.

• When a subclass defines a static method with the same signature as a static method in the superclass, it is called method hiding.

• Method hiding does not follow polymorphism and is resolved at compile time based on the reference type.

• Example: class...read more

Yes, a static local variable can be created inside a static method.

• Yes, a static local variable can be declared inside a static method in programming languages like C++.

• Static local variables retain their values between function calls.

• Example: static void myStaticMethod() { static int count = 0; count++; }

String memory allocation is dynamic and depends on the length of the string.

• String memory allocation is dynamic and can change based on the length of the string.

• In Java, a String object is stored in the heap memory.

• Each character in a String typically takes up 2 bytes of memory.

• String objects in Java are immutable, meaning once a String object is created, it cannot be changed.

Yes, you can create a static method inside an abstract class or interface.

• Static methods can be defined in interfaces since Java 8.

• Static methods in interfaces are used for providing utility methods that are not tied to any specific instance of the interface.

• Static methods in abstract classes can be used for common functionality that does not require an instance of the class.

The parent class of Java is the Object class.

• All classes in Java are directly or indirectly derived from the Object class.

• The Object class is the root class in Java's class hierarchy.

• It provides methods that are common to all objects in Java, such as toString(), equals(), and hashCode().

Window Handles in Selenium are unique identifiers used to handle multiple browser windows in a Selenium test script.

• Window Handles are unique alphanumeric strings assigned to each browser window opened by Selenium.

• They are used to switch between different browser windows during a test script execution.

• Window Handles can be obtained using getWindowHandles() method in Selenium.

• Example: Set handles = driver.getWindowHandl

Code to count the occurrences of each letter in a string and print the result

• Iterate through each character in the string

• Use a dictionary to store the count of each letter

• Print the count of each letter at the end

Appium server can be started using command line, programmatically in code, or using Appium desktop app.

• Start Appium server using command line by running 'appium' command

• Start Appium server programmatically in code using Appium server programmatically in code using AppiumDriverLocalService class

• Start Appium server using Appium desktop app by launching the app and starting the server

Tests can be run parallel for mobile devices using test automation frameworks like Appium or Espresso.

• Use test automation frameworks like Appium or Espresso to run tests parallel for mobile devices

• Leverage cloud-based testing platforms like Sauce Labs or BrowserStack for parallel testing on multiple devices

• Implement parallel test execution using tools like TestNG or JUnit in combination with Appium or Espresso

• Utilize d...read more

Automating OTP in mobile involves using automation tools to interact with the OTP input field and validate the received OTP.

• Use automation tools like Appium or Espresso to interact with the OTP input field

• Extract the OTP from the message received on the mobile device

• Validate the extracted OTP with the OTP input field

• Handle scenarios where OTP validation fails

Desired capabilities are a set of properties or attributes that define the behavior of a browser or mobile device in Selenium automation testing.

• Desired capabilities are key-value pairs that are used to configure the WebDriver instances in Selenium.

• They can be used to set properties like browser name, version, platform, and other settings.

• For example, setting 'browserName' to 'chrome' will launch the Chrome browser dur

To run tests on iOS or Android devices using Appium, specify the platformName capability in desired capabilities.

• Specify platformName capability as 'iOS' for iOS devices and 'Android' for Android devices

• Include other necessary desired capabilities like deviceName, platformVersion, appPackage, appActivity, etc.

• Example: capabilities.setCapability('platformName', 'iOS');

Setting up automation for iOS devices involves using tools like Appium and Xcode for testing mobile applications.

• Install Xcode on your Mac machine

• Set up Appium for iOS automation

• Connect your iOS device to the Mac machine

• Create test scripts using Appium for iOS apps

• Execute the test scripts on the connected iOS device

Reverse a string using Java program and handle stale element in Selenium

• Create a Java program to reverse a string using StringBuilder or char array

• In Selenium, handle stale element exception by refreshing the element or using WebDriverWait

• Example: Java program - input: 'hello', output: 'olleh'; Selenium - handle stale element by refreshing the element before interacting with it

My expected salary is based on my experience, skills, and the market rate for Automation Test Engineers.

• I have researched the average salary range for Automation Test Engineers in this location.

• I am looking for a competitive salary that reflects my expertise in automation testing.

• I am open to negotiation based on the overall compensation package offered.