01
How do you verify response time and headers in REST Assured?
Show answer
Use then().time(lessThan(2000L)) and then().header("Content-Type", containsString("json")) along with body assertions.
Automation Testing Interview Questions in Coimbatore
36 practice questions with answers for Automation Testing interviews in Coimbatore.
Automation Testing jobs in Coimbatore
Coimbatore has a growing IT-services and engineering-services market around TIDEL Park and its SEZs, supported by a large pool of engineering graduates. Many roles are with delivery centres of bigger IT firms.
Below are 36 questions that match the mix of service, product and domain employers hiring automation testers in Coimbatore.
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02
File upload tests pass locally but fail when they run on a remote Grid. Why?
Show answer
sendKeys with a file path sends a path that exists on your test machine, but the browser runs on the remote node where that path does not exist. Set a LocalFileDetector on the RemoteWebDriver, using ((RemoteWebDriver) driver).setFileDetector(new LocalFileDetector()), so Selenium zips and transfers the file to the node first. Alternatively mount the test data folder into the node container. Always use absolute paths.
03
List common TestNG annotations and their order.
Show answer
BeforeSuite, BeforeTest, BeforeClass, BeforeMethod, Test, AfterMethod, AfterClass, AfterTest and AfterSuite.
04
Your team has 600 Cucumber scenarios and step definitions have become a mess of duplicates. What do you do?
Show answer
First run a report of step usage to find duplicate and unused steps. Agree a step vocabulary per domain, merge near-identical steps using parameters, and delete unused ones. Move logic out of steps into page objects and service helpers. Add a review checklist and a dryRun gate in CI. Do this incrementally by feature area so the suite keeps running while you clean up.
05
What are TestNG and JUnit 5 differences that matter in automation?
Show answer
TestNG has built-in groups, dependencies, suite XML, DataProvider and flexible parallel options, which suit large Selenium suites. JUnit 5 has a modular platform, tags, parameterized tests, extensions and strong IDE and tool support, and is the default for Spring and Cucumber's JUnit Platform engine. Both are capable; the choice usually follows team standards and existing frameworks.
06
Write a declarative Jenkinsfile that runs Maven tests and publishes results.
Show answer
pipeline {
agent any
parameters { choice(name: 'SUITE', choices: ['smoke', 'regression']) }
stages {
stage('Checkout') { steps { checkout scm } }
stage('Test') {
steps { sh "mvn clean test -DsuiteXml=${params.SUITE}.xml" }
}
}
post {
always {
junit 'target/surefire-reports/*.xml'
archiveArtifacts artifacts: 'target/screenshots/**', allowEmptyArchive: true
}
}
}
07
How do you handle stakeholders who ask for performance testing only a few days before go-live?
Show answer
Situation: a product team requested load testing three days before launch. Task: give useful results fast and set expectations. Action: I explained the risk, agreed on the two most critical journeys, reused API scripts and ran a short load and spike test, sharing results daily. I also proposed adding a performance stage to future sprints. Result: we found a missing database index before launch, and the next release included performance tests from the start.
08
You need the same test to support Chrome, Firefox and Edge. How would you design driver creation in Java?
Show answer
Use a factory: a BrowserType enum and a DriverFactory.create(BrowserType) that returns the right WebDriver with its options, using a switch. Read the browser from a system property with a default. For remote runs, return RemoteWebDriver with the same options. Tests depend only on the WebDriver interface, so adding a new browser changes one class, following the open-closed principle.
09
What is PageFactory?
Show answer
A helper that initialises @FindBy elements lazily using initElements; some teams skip it in favour of plain By locators.
10
What is the Fluent Page Object pattern?
Show answer
Fluent page objects return objects from every action so a test reads like a sentence, for example new SearchPage(driver).searchFor("phone").filterByBrand("X").sortByPrice().firstResult(). It improves readability and models navigation. The risk is long chains that hide failures, so keep chains to a single journey and use clear method names that show which page you end on.
11
What is the difference between driver.close() and driver.quit()?
Show answer
close() closes the current window; quit() closes all windows and ends the driver session.
12
What is contract testing?
Show answer
Verifying that a provider and consumer agree on request and response formats, using tools like Pact, to catch breaking changes early.
13
Write Java code to start an Android Appium session using UiAutomator2Options.
Show answer
UiAutomator2Options options = new UiAutomator2Options()
.setPlatformName("Android")
.setAutomationName("UiAutomator2")
.setDeviceName("Pixel_7_API_34")
.setApp(System.getProperty("user.dir") + "/apps/shop.apk")
.setAutoGrantPermissions(true)
.setNewCommandTimeout(Duration.ofSeconds(120));
AndroidDriver driver = new AndroidDriver(
new URL("http://127.0.0.1:4723"), options);
driver.manage().timeouts().implicitlyWait(Duration.ZERO);
// use explicit waits in tests
driver.quit();
14
How do you run tests in parallel?
Show answer
Use TestNG parallel="methods | classes | tests" with thread-count, keep WebDriver in a ThreadLocal, and use Selenium Grid or a cloud grid for multiple browsers.
15
Mobile tests pass on the emulator but fail on a low-end real device. How do you investigate?
Show answer
Low-end devices are slower, so fixed waits and short timeouts expire before screens render. Replace sleeps with explicit waits and increase timeouts sensibly. Check for vendor-specific pop-ups, battery optimisation dialogs or different keyboards on that brand. Compare screen size and resolution, since coordinate-based taps break. Collect device logs with adb logcat and screen recordings to see what the app was doing. Also check whether the app crashed due to low memory.
16
What is idempotency in REST APIs and why does it matter for testing?
Show answer
An idempotent operation gives the same result no matter how many times it is called. GET, PUT and DELETE should be idempotent; POST usually is not. Testers verify that repeating a PUT does not create duplicates and that a second DELETE returns a sensible status like 404 or 204. Retries in networks and CI make idempotency important to verify.
17
How do you handle a test that is flaky only in headless mode?
Show answer
Set window size explicitly, use proper waits, check animations and viewport differences, and capture screenshots and logs to find timing issues.
18
A utility method that parses dates from the UI breaks in parallel runs. What might be wrong?
Show answer
It probably uses a shared static SimpleDateFormat, which is not thread-safe, so parallel threads corrupt each other's parsing. Replace it with java.time DateTimeFormatter, which is immutable and thread-safe, and LocalDate or LocalDateTime for values. Generally, avoid shared mutable static objects in test utilities that run in parallel.
19
What is the difference between hard and soft assertions?
Show answer
Hard assert stops the test at the first failure; SoftAssert collects failures and reports them together when assertAll() is called.
20
A developer changed the UI and 40 tests failed with NoSuchElementException. How does POM help here?
Show answer
Because locators live only in page classes, I check which page object methods fail, update the changed locators in those few classes, and rerun. Usually 40 failures map to two or three locators. I would also ask developers to add stable data-testid attributes and review UI changes with QA early, so future changes do not break tests unexpectedly.
21
What is the use of the this and super keywords?
Show answer
this refers to the current object; super refers to the parent class, used to call parent constructors and methods.
22
What are the Actions class use cases?
Show answer
Mouse and keyboard actions such as hover, drag and drop, double click, right click and key combinations, built with moveToElement(...).perform().
23
Write Java code to find duplicate elements in a list.
Show answer
List<String> names = List.of("Asha", "Ravi", "Asha", "Neha", "Ravi");
Set<String> seen = new HashSet<>();
Set<String> dupes = new LinkedHashSet<>();
for (String n : names) {
if (!seen.add(n)) {
dupes.add(n);
}
}
System.out.println(dupes); // [Asha, Ravi]
24
How do you handle test data cleanup in Cucumber scenarios?
Show answer
Create data in Given steps through APIs, record the created IDs in the scenario context, and delete them in an @After hook, which runs even when the scenario fails. Use unique names with a timestamp or UUID to avoid clashes in parallel runs. For shared environments, add a nightly cleanup job for leftover data tagged with a test prefix.
25
What is a DataTable in Cucumber and how do you use it?
Show answer
A DataTable passes a table written under a step into the step definition. You can read it as List<String>, List<Map<String,String>>, Map<String,String> or convert rows into objects with a @DataTableType method. For example a step that creates several users can take a table of name, role and email. Unlike Scenario Outline, a DataTable feeds data into one step and the scenario runs once.
26
Your CI pipeline is blocked because a downstream service needed for API tests is often down. What do you do?
Show answer
Add a health check stage that pings dependencies before tests and marks the run as environment failure rather than test failure. For tests that do not need the real service, use stubs. Escalate with data on downtime frequency to the team owning the service. Keep a separate scheduled job for the real integration tests so pull requests are not blocked.
27
What is the difference between open and closed workload models in load testing?
Show answer
In a closed model a fixed number of users loop through the scenario, so when the server slows down, users wait and the arrival rate drops, which can hide problems. In an open model new requests arrive at a set rate regardless of response time, like real internet traffic, so a slow server builds a queue. JMeter thread groups are closed by default; the Open Model Thread Group or throughput timers approximate open workloads.
28
Why do Selenium browser containers need a larger shm_size?
Show answer
Chrome and Firefox use shared memory at /dev/shm for rendering and inter-process communication. Docker gives containers only 64 MB of shared memory by default, which is not enough for modern pages, so the browser tab crashes with errors like session deleted because of page crash. Setting shm_size to 2g in Compose, or --shm-size=2g with docker run, fixes it. Mounting /dev/shm from the host is an alternative.
29
How do you retry failed tests in TestNG?
Show answer
Implement IRetryAnalyzer with a retry count and attach it through the test annotation or a listener to rerun flaky tests.
30
Chrome inside a Docker node keeps crashing with session deleted because of page crash. How do you fix it?
Show answer
This is almost always shared memory exhaustion, because Docker's default /dev/shm of 64 MB is too small for Chrome. Set shm_size: 2gb in Compose or --shm-size=2g in docker run. Also check the container's memory limit and the number of sessions per node, since several browsers in one container multiply memory use. Heavy pages or memory leaks in long sessions can also crash tabs, so restart sessions between test classes.
31
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.
32
How do you manage test data in a framework?
Show answer
Use external files or APIs and database setup scripts, generate unique data per run, and clean up afterwards so tests stay independent.
33
What are wrapper classes in Java?
Show answer
Classes such as Integer and Double that wrap primitive types as objects, needed for collections and for parsing text from web elements.
34
How have you handled disagreement with a developer about whether something is a bug?
Show answer
Situation: a developer said a rounding difference in invoice totals was expected. Task: resolve it without friction. Action: I checked the requirement, found it specified rounding per line, and brought the document and a test case with expected values to a quick call with the BA. Result: the BA confirmed it was a bug, it was fixed, and we added the rule to the acceptance criteria.
35
How do you run Selenium tests in Docker containers in CI?
Show answer
Use official Selenium images, either standalone-chrome for simple runs or a Grid with hub and node containers via Docker Compose. The test container or Jenkins agent points RemoteWebDriver to http://selenium-hub:4444. Containers give the same browser version everywhere and are cleaned after each run. Add shm_size for Chrome stability and record videos for failed tests if needed.
36
What are access modifiers in Java?
Show answer
public (everywhere), protected (package and subclasses), default (package) and private (same class), used to control visibility of test utilities.
Few big employers listed in Coimbatore?
Many Coimbatore candidates also apply to teams in Chennai and to remote or hybrid roles. Practise the Chennai set as well.
Frequently asked questions
Which companies hire Automation Testing professionals in Coimbatore?
Companies with large offices in Coimbatore include many IT services and product firms. Use their company pages below to practise employer-specific sets.
Are Automation Testing interviews in Coimbatore different from other cities?
The questions depend more on the company than the city. Coimbatore's mix of employers decides the style: Many roles are with delivery centres of bigger IT firms
How do I find Automation Testing jobs in Coimbatore?
Shortlist companies with Coimbatore offices, keep your CV focused on Automation Testing projects, apply on company career pages and job portals with the Coimbatore filter, and practise the questions on this page before each interview.
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