01
What is Selenium Grid and why use it?
Show answer
It runs tests in parallel across multiple machines and browsers using a hub and nodes, cutting execution time and increasing browser coverage.
Automation Testing Rapid-Fire Questions & Answers
50 questions for the rapid-fire stage — 29 easy, 21 medium.
About the rapid-fire round
Rapid-fire questions are quick definitions and one-line answers that interviewers fire at the start or end of a round to check your Automation Testing basics. Aim to answer each in under 20 seconds.
Tips for the rapid-fire round
- Answer in one or two sentences, then stop.
- If you don't know, say so quickly and move on; don't guess at length.
- Revise these the morning of the interview.
- Practise with a friend who reads them in random order.
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02
What is the difference between git merge and git rebase?
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Merge combines branches by creating a merge commit, keeping the full history exactly as it happened. Rebase replays your commits on top of another branch, producing a straight, linear history without a merge commit. Rebase is good for tidying a local feature branch before a pull request; never rebase commits that others have already pulled, because it rewrites history.
03
What is the purpose of testng.xml?
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A configuration file to define suites, tests, classes, groups, parameters and parallel execution settings.
04
What is the post section in a Jenkins declarative pipeline?
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post defines steps that run after stages based on the result: always, success, failure, unstable, changed, fixed and cleanup. In test pipelines, always publishes JUnit results and archives screenshots and reports, failure sends a Slack or email alert, and cleanup removes the workspace. Putting reporting in post ensures results are saved even when tests fail.
05
What are the advantages of version control for test code?
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Git tracks changes, enables code review, branching and rollback and lets teams collaborate on the framework safely.
06
What causes an AmbiguousStepDefinitionsException?
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It occurs when one Gherkin step matches two or more step definitions, usually because of broad regular expressions or duplicate methods in different classes within the glue. Fix it by making expressions more specific, anchoring regexes with ^ and $, or removing the duplicate. Keeping step definitions organised by domain and reviewing new steps in pull requests prevents it.
07
String vs StringBuilder?
Show answer
String is immutable — every change creates a new object. StringBuilder is mutable and faster for repeated changes (not thread-safe; StringBuffer is).
08
Where do you use OOP concepts in your framework?
Show answer
Encapsulation: private locators with public page methods. Inheritance: pages extend a BasePage. Polymorphism: the WebDriver interface for different browsers. Abstraction: utility layers hiding Selenium details.
09
What is Selenium and what are its components?
Show answer
An open-source suite for browser automation: WebDriver, IDE, Grid and the older RC. WebDriver controls browsers through their native drivers.
10
How does the DataProvider annotation work?
Show answer
A method annotated with @DataProvider returns a 2D object array and the test with dataProvider = "name" runs once per row.
11
What is the timeOut attribute in TestNG?
Show answer
@Test(timeOut = 5000) fails the test if it runs longer than 5000 milliseconds. It can also be set at suite or test level in testng.xml. It protects pipelines from hanging tests, for example a stuck network call. It is not a performance test; use reasonable limits so slow but correct environments do not cause false failures.
12
What is git cherry-pick?
Show answer
git cherry-pick <commit> applies the changes of one specific commit onto your current branch, creating a new commit. It is useful when a fix on one branch, such as a locator fix on develop, is urgently needed on a release branch without merging everything else. Overuse creates duplicate commits and confusing history, so prefer normal merges when possible.
13
What locator strategy do you follow inside page objects?
Show answer
Prefer stable attributes in this order: dedicated test attributes like data-testid, id, name, then short CSS selectors, and XPath only when text or complex relationships are needed. Avoid absolute XPaths and index-based locators. Keep locators as private final By fields at the top of the class with clear names, so updates are quick and readable.
14
Implicit vs explicit vs fluent wait?
Show answer
Implicit wait applies globally to element lookups. Explicit wait waits for a specific condition (WebDriverWait + ExpectedConditions). Fluent wait is an explicit wait with custom polling and ignored exceptions.
15
What is dryRun in Cucumber and when do you use it?
Show answer
dryRun=true makes Cucumber parse all feature files and check every step has a matching definition without actually executing anything. It is fast and is useful after writing new features, during refactoring, or as a quick CI gate to catch undefined or ambiguous steps. It also prints snippets for missing step definitions that you can paste and implement.
16
What is a .gitignore file and what should an automation project ignore?
Show answer
A .gitignore lists files Git should not track. In a Java automation project ignore target/, test-output/, allure-results/, reports, screenshots, logs, IDE folders like .idea and .vscode, *.iml, OS files like .DS_Store, and local config files holding secrets. Ignoring generated output keeps the repository small and avoids noisy diffs and conflicts.
17
What is Postman and how do you automate with it?
Show answer
An API client. Add tests in JavaScript, use environments and collections, and run them with Newman in a CI pipeline.
18
What is the difference between continuous delivery and continuous deployment?
Show answer
In continuous delivery every change that passes the pipeline is ready to release, but a person approves the production deployment. In continuous deployment every passing change is released to production automatically. Continuous deployment requires very reliable automated tests and monitoring, because there is no manual check before users see the change.
19
What do HTTP status codes 200, 201, 400, 401, 403, 404 and 500 mean?
Show answer
200 OK, 201 Created, 400 bad request, 401 unauthenticated, 403 forbidden, 404 not found and 500 server error.
20
What is the difference between getText() and getAttribute()?
Show answer
getText returns visible inner text; getAttribute returns an HTML attribute or property such as value, href or class.
21
How do you avoid page object classes becoming too large?
Show answer
Split pages into components for repeated or complex areas, keep only user actions as public methods, move generic helpers to BasePage or utilities, and avoid one method per element. If a page has distinct modes like view and edit, use separate classes. Review page classes during code review and refactor when they cross a few hundred lines.
22
What is the difference between git fetch and git pull?
Show answer
git fetch downloads new commits and branches from the remote but does not change your working files; you can inspect them with git log origin/main. git pull is fetch followed by merge (or rebase if configured) into your current branch. Fetch is safer when you want to review changes before integrating them.
23
How do you trigger a Jenkins job automatically?
Show answer
Common triggers are webhooks from GitHub, GitLab or Bitbucket on push or pull request, cron schedules with triggers { cron('H 2 * * *') } for nightly regression, polling SCM (less efficient), and upstream jobs completing, such as running tests after a deploy job. Multibranch pipelines automatically create jobs for each branch and pull request containing a Jenkinsfile.
24
What is the difference between path params and query params in REST Assured?
Show answer
Path params are part of the URL path and identify a resource, such as /users/{id}; you set them with pathParam("id", 5). Query params come after ? and filter or modify the result, such as /users?page=2; you set them with queryParam("page", 2). REST Assured URL-encodes both. Using named params instead of string concatenation makes tests cleaner and safer.
25
Method overloading vs overriding?
Show answer
Overloading: same method name, different parameters, in the same class (compile time). Overriding: a subclass redefines a parent method with the same signature (runtime polymorphism). WebDriver driver = new ChromeDriver() is runtime polymorphism.
26
What is the difference between @BeforeTest and @BeforeMethod?
Show answer
@BeforeTest runs once before all methods in a test tag of testng.xml; @BeforeMethod runs before every test method.
27
What is polymorphism and how does it show up in Selenium?
Show answer
One interface, many forms. WebDriver driver = new ChromeDriver() lets the same test code run on any browser class that implements WebDriver.
28
What are try-with-resources and why use them?
Show answer
A try block that automatically closes resources such as file readers or streams, preventing leaks without a finally block.
29
How do you measure and assert API response time in REST Assured?
Show answer
Use then().time(lessThan(2000L)) for a quick check or response.getTimeIn(TimeUnit.MILLISECONDS) to log the value. This measures client-side time, including network, so set generous thresholds and treat it as a smoke signal, not a performance test. For real load and latency percentiles, use tools such as JMeter, Gatling or k6.
30
What is the difference between == and equals() in Java?
Show answer
== compares references (or primitive values); equals() compares content when overridden, as in String.
31
What branching strategy do you use for test automation code?
Show answer
Most teams use trunk-based development or a light GitHub Flow: short-lived feature branches from main, a pull request with review and a CI run, then merge. Long-lived branches cause painful conflicts. Keep automation code in the same repository as the app when possible so tests change together with features, or tag test versions to match app releases.
32
What is JSON and how is it used in API testing?
Show answer
A lightweight text format of key-value pairs and arrays used in API requests and responses, validated field by field in tests.
33
What is the difference between static and non-static members?
Show answer
Static members belong to the class and are shared by all instances; non-static members belong to each object.
34
What are the three amigos in BDD?
Show answer
The three amigos are the business representative (product owner or BA), the developer and the tester, who meet before development to discuss a story. They agree on rules and concrete examples, which become Gherkin scenarios. The meeting catches misunderstandings early, before code is written. Cucumber automation is the output, but the conversation is the real value of BDD.
35
What is a webhook and how do you test it?
Show answer
A callback where one system sends an HTTP request to another when an event occurs. Test with a mock receiver or tools such as webhook.site and verify the payload.
36
What is the difference between @Test(priority) and dependsOnMethods in TestNG?
Show answer
priority only orders tests; a lower number runs first, and a failed test does not stop the others. dependsOnMethods creates a real dependency: if the parent test fails, dependent tests are skipped. Both make tests order-dependent, which hurts parallel runs and isolation, so use them sparingly. Prefer independent tests with their own setup.
37
findElement vs findElements?
Show answer
findElement returns the first match and throws NoSuchElementException if nothing is found. findElements returns a List (empty if nothing is found) — handy to check whether an element exists.
38
Common HTTP status codes?
Show answer
200 OK, 201 Created, 204 No Content, 400 Bad Request, 401 Unauthorized, 403 Forbidden, 404 Not Found, 500 Internal Server Error.
39
What is the difference between Scenario and Scenario Outline in Cucumber?
Show answer
A Scenario runs once with fixed values. A Scenario Outline is a template with placeholders in angle brackets, and an Examples table supplies rows of data, so the same steps run once per row. Use an Outline when only the data changes, such as testing login with valid, locked and expired users. Avoid huge Examples tables; if data grows large, move it to an external source.
40
What is TestNG and why is it used with Selenium?
Show answer
A test framework offering annotations, grouping, prioritisation, parallel runs, data providers and reports, which structure and scale Selenium tests.
41
ArrayList vs HashMap — how do you use them in a framework?
Show answer
ArrayList stores an ordered list (e.g. all product names on a page). HashMap stores key–value pairs (e.g. test data or config properties).
42
What is the Page Object Model?
Show answer
A design pattern where each page is a class holding its locators and actions, so tests stay readable and a locator change is fixed in one place.
43
What are listeners in TestNG?
Show answer
Classes like ITestListener that react to events such as test start, success or failure, commonly used for screenshots and reporting.
44
How does HashMap work internally?
Show answer
It uses the key's hashCode to find a bucket and equals to resolve collisions, giving O(1) average lookups; Java 8 converts long buckets into trees.
45
What does a good commit message look like?
Show answer
A short summary line under about 60 characters in the imperative mood, like "Add retry for flaky payment test", followed by a blank line and a body explaining why the change was made if not obvious. Reference the ticket ID. Small focused commits with clear messages make reviews faster and help when using git log or git bisect to find when a test broke.
46
What is an API and what are common HTTP methods?
Show answer
An interface for systems to talk to each other. GET reads, POST creates, PUT replaces, PATCH updates partially and DELETE removes.
47
What is the Maven Surefire plugin and how do you configure it for TestNG?
Show answer
Surefire runs tests during the test phase. For TestNG, configure suiteXmlFiles with the path to testng.xml, so mvn test runs that suite. You can pass system properties, set parallel and threadCount, and control reports. Make the suite file a property like ${suiteXml} so CI can choose smoke.xml or regression.xml with -DsuiteXml=smoke.xml.
48
What is the difference between SOAP and REST?
Show answer
SOAP is a strict XML protocol with WSDL and WS-Security; REST is a lighter architectural style using HTTP and usually JSON.
49
Difference between an abstract class and an interface?
Show answer
An abstract class can hold state and concrete methods; an interface defines a contract (with default methods since Java 8). A class extends one abstract class but can implement many interfaces.
50
What is the test pyramid and how does it guide automation?
Show answer
The pyramid suggests many fast unit tests at the base, fewer API or service tests in the middle and a small number of UI end-to-end tests at the top. Lower-level tests are faster and less flaky. An inverted pyramid with mostly UI tests leads to slow, brittle pipelines. Use it as a guide to put each check at the cheapest level that still catches the bug.
Frequently asked questions
What happens in the Automation Testing rapid-fire round?
Rapid-fire questions are quick definitions and one-line answers that interviewers fire at the start or end of a round to check your Automation Testing basics. Aim to answer each in under 20 seconds.
How do I clear the rapid-fire round?
Answer in one or two sentences, then stop. If you don't know, say so quickly and move on; don't guess at length. Revise these the morning of the interview.
Which round comes next?
A typical order is online assessment, telephonic screening, one or two technical rounds, a managerial round and HR. Use the other round pages to practise each stage.
Practise every interview round
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