Jest Test

The Jest online test uses multiple-choice questions to evaluate candidates on their knowledge of Jest, which is a popular JavaScript testing framework used for testing React and Node.js applications. The test covers topics such as testing fundamentals, test-driven development, Jest configuration and setup, test matchers and assertions, mocking and spying, async testing, and snapshot testing. The test aims to evaluate candidates on their ability to write effective and maintainable test cases, debug and troubleshoot testing issues, and integrate Jest with other tools and frameworks.

Covered skills:

Data Layers
Statistical Layers
Initializers
Test Execution
Mocha Backends
Computation Layer
Utility Layers
CPU Backend with Native Extention

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About the Jest Assessment Test

The Jest Test helps recruiters and hiring managers identify qualified candidates from a pool of resumes, and helps in taking objective hiring decisions. It reduces the administrative overhead of interviewing too many candidates and saves time by filtering out unqualified candidates at the first step of the hiring process.

The test screens for the following skills that hiring managers look for in candidates:

Ability to write effective and efficient Jest test cases
Ability to implement and utilize testing frameworks for JavaScript
Ability to work with data and statistics in testing
Ability to initialize and set up testing environments
Ability to execute tests and analyze results
Understanding of Mocha backends and its usage in testing
Understanding of computation layer and its role in testing
Ability to utilize utility layers in testing
Familiarity with CPU backend and native extensions
Understanding of data layers and their importance in testing
Knowledge of statistical layers and their significance in testing
Awareness of the role of initializers in testing

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Non-googleable questions

We have a very high focus on the quality of questions that test for on-the-job skills. Every question is non-googleable and we have a very high bar for the level of subject matter experts we onboard to create these questions. We have crawlers to check if any of the questions are leaked online. If/ when a question gets leaked, we get an alert. We change the question for you & let you know.

How we design questions

These are just a small sample from our library of 15,000+ questions. The actual questions on this Jest Test will be non-googleable.

🧐 Question
Easy Floating points	Solve
Check the following Jest tests: Which of the tests will pass?
Medium Database testcase Regression Testing Regression Testing In Specific Contexts Test Case Analysis	Solve
Adaface is developing a new database system called “Helen”. The tester at Adaface developed the following testcase for regression testing: 1. Open Helen 2. Open “Students” database 3. Enter data for “Sid” 4. Set checkpoint 5. Store “Sid” data in “Students” 6. Restart Helen 7. Read “Sid” data from “Students” 8. Compare checkpoint with the contents When the tester ran the testcase the first time, it worked as expected. Pick the correct statements: A: When the test case is ran the second time, the data entry for “Sid” already exists in the database. B: When the test case is ran the second time, it performs exactly as it did the first time C: The testcase is a good example for regression testing “Helen” D: The testcase is not a good example for regression testing “Helen” since the system behaves differently when the testcase is ran the second time
Medium Decision Table	Solve
Check the following decision table: What are the expected actions for following testcases? I: Joey's age is 22. He is a smoker residing in India II: Jennifer's age is 62. She is a non-smoker not residing in India A) I - Insure, 10% discount. II - Insure, no discount B) I - Don't insure. II - Don't insure C) I - Insure, no discount. II - Don't insure D) I - Insure, no discount. II - Insure, 10% discount
Easy Cart Checkout Incident Report	Solve
Review the following incident report written QA team of LWB, Little White Book (an e-commerce app): 1. Place any items in the cart (Say “Nike FST Men”). 2. Place any other (different) item in the shopping cart (Say “Nike Air Max”). 3. Remove “Nike FST Men” from the shopping cart, but leave “Nike Air Max” in the cart. 4. Click on “Check out” button. 5. Expect the app to display the check out screen, instead ‘No items in the shopping cart. Click continue to go back to shopping.’ error message is shown as a popup. 6. Click “Continue”. 7. Expect the app to go to shopping screen to add/remove items from the cart. Instead the app crashes. 8. The error in steps 5 and 7 occurred in every attempt of 5 attempts (1 2 3 4 and 6). Which of the following information is missing from the incident report?
Medium Async Await Promises Promises Async-Await Asynchronous Programming	Solve
What will the following code output? A: 24 after 5 seconds and after another 5 seconds, another 24 B: 24 followed by another 24 immediately C: 24 immediately and another 24 after 5 seconds D: After 5 seconds, 24 and 24 E: Undefined F: NaN G: None of these
Medium Bitcoin prices Axios Promises	Solve
Review the following JavaScript code and pick the correct options: Assume that the API returns a successful 200 response code and a JSON object as the response body. What would the value of ‘a’ be after the code is executed?
Medium My Module Scope Javascript Es6 Closure	Solve
What will the output of the following JavaScript code be?
Medium Promise Resolve Promises Async-Await Code Analysis Syntax Understanding	Solve
What does the following code output?
Easy Throw, Try, Async Promises Async-Await Async/await	Solve
What does the following JS code output?

	🧐 Question	🔧 Skill
	Easy Floating points	2 mins Jest	Solve
Check the following Jest tests: Which of the tests will pass?
	Medium Database testcase Regression Testing Regression Testing In Specific Contexts Test Case Analysis	2 mins Testing	Solve
Adaface is developing a new database system called “Helen”. The tester at Adaface developed the following testcase for regression testing: 1. Open Helen 2. Open “Students” database 3. Enter data for “Sid” 4. Set checkpoint 5. Store “Sid” data in “Students” 6. Restart Helen 7. Read “Sid” data from “Students” 8. Compare checkpoint with the contents When the tester ran the testcase the first time, it worked as expected. Pick the correct statements: A: When the test case is ran the second time, the data entry for “Sid” already exists in the database. B: When the test case is ran the second time, it performs exactly as it did the first time C: The testcase is a good example for regression testing “Helen” D: The testcase is not a good example for regression testing “Helen” since the system behaves differently when the testcase is ran the second time
	Medium Decision Table	3 mins Testing	Solve
Check the following decision table: What are the expected actions for following testcases? I: Joey's age is 22. He is a smoker residing in India II: Jennifer's age is 62. She is a non-smoker not residing in India A) I - Insure, 10% discount. II - Insure, no discount B) I - Don't insure. II - Don't insure C) I - Insure, no discount. II - Don't insure D) I - Insure, no discount. II - Insure, 10% discount
	Easy Cart Checkout Incident Report	2 mins Testing	Solve
Review the following incident report written QA team of LWB, Little White Book (an e-commerce app): 1. Place any items in the cart (Say “Nike FST Men”). 2. Place any other (different) item in the shopping cart (Say “Nike Air Max”). 3. Remove “Nike FST Men” from the shopping cart, but leave “Nike Air Max” in the cart. 4. Click on “Check out” button. 5. Expect the app to display the check out screen, instead ‘No items in the shopping cart. Click continue to go back to shopping.’ error message is shown as a popup. 6. Click “Continue”. 7. Expect the app to go to shopping screen to add/remove items from the cart. Instead the app crashes. 8. The error in steps 5 and 7 occurred in every attempt of 5 attempts (1 2 3 4 and 6). Which of the following information is missing from the incident report?
	Medium Async Await Promises Promises Async-Await Asynchronous Programming	2 mins JavaScript	Solve
What will the following code output? A: 24 after 5 seconds and after another 5 seconds, another 24 B: 24 followed by another 24 immediately C: 24 immediately and another 24 after 5 seconds D: After 5 seconds, 24 and 24 E: Undefined F: NaN G: None of these
	Medium Bitcoin prices Axios Promises	2 mins JavaScript	Solve
Review the following JavaScript code and pick the correct options: Assume that the API returns a successful 200 response code and a JSON object as the response body. What would the value of ‘a’ be after the code is executed?
	Medium My Module Scope Javascript Es6 Closure	2 mins JavaScript	Solve
What will the output of the following JavaScript code be?
	Medium Promise Resolve Promises Async-Await Code Analysis Syntax Understanding	2 mins JavaScript	Solve
What does the following code output?
	Easy Throw, Try, Async Promises Async-Await Async/await	2 mins JavaScript	Solve
What does the following JS code output?

	🧐 Question	🔧 Skill	💪 Difficulty	⌛ Time
	Floating points	Jest	Easy	2 mins	Solve
Check the following Jest tests: Which of the tests will pass?
	Database testcase Regression Testing Regression Testing In Specific Contexts Test Case Analysis	Testing	Medium	2 mins	Solve
Adaface is developing a new database system called “Helen”. The tester at Adaface developed the following testcase for regression testing: 1. Open Helen 2. Open “Students” database 3. Enter data for “Sid” 4. Set checkpoint 5. Store “Sid” data in “Students” 6. Restart Helen 7. Read “Sid” data from “Students” 8. Compare checkpoint with the contents When the tester ran the testcase the first time, it worked as expected. Pick the correct statements: A: When the test case is ran the second time, the data entry for “Sid” already exists in the database. B: When the test case is ran the second time, it performs exactly as it did the first time C: The testcase is a good example for regression testing “Helen” D: The testcase is not a good example for regression testing “Helen” since the system behaves differently when the testcase is ran the second time
	Decision Table	Testing	Medium	3 mins	Solve
Check the following decision table: What are the expected actions for following testcases? I: Joey's age is 22. He is a smoker residing in India II: Jennifer's age is 62. She is a non-smoker not residing in India A) I - Insure, 10% discount. II - Insure, no discount B) I - Don't insure. II - Don't insure C) I - Insure, no discount. II - Don't insure D) I - Insure, no discount. II - Insure, 10% discount
	Cart Checkout Incident Report	Testing	Easy	2 mins	Solve
Review the following incident report written QA team of LWB, Little White Book (an e-commerce app): 1. Place any items in the cart (Say “Nike FST Men”). 2. Place any other (different) item in the shopping cart (Say “Nike Air Max”). 3. Remove “Nike FST Men” from the shopping cart, but leave “Nike Air Max” in the cart. 4. Click on “Check out” button. 5. Expect the app to display the check out screen, instead ‘No items in the shopping cart. Click continue to go back to shopping.’ error message is shown as a popup. 6. Click “Continue”. 7. Expect the app to go to shopping screen to add/remove items from the cart. Instead the app crashes. 8. The error in steps 5 and 7 occurred in every attempt of 5 attempts (1 2 3 4 and 6). Which of the following information is missing from the incident report?
	Async Await Promises Promises Async-Await Asynchronous Programming	JavaScript	Medium	2 mins	Solve
What will the following code output? A: 24 after 5 seconds and after another 5 seconds, another 24 B: 24 followed by another 24 immediately C: 24 immediately and another 24 after 5 seconds D: After 5 seconds, 24 and 24 E: Undefined F: NaN G: None of these
	Bitcoin prices Axios Promises	JavaScript	Medium	2 mins	Solve
Review the following JavaScript code and pick the correct options: Assume that the API returns a successful 200 response code and a JSON object as the response body. What would the value of ‘a’ be after the code is executed?
	My Module Scope Javascript Es6 Closure	JavaScript	Medium	2 mins	Solve
What will the output of the following JavaScript code be?
	Promise Resolve Promises Async-Await Code Analysis Syntax Understanding	JavaScript	Medium	2 mins	Solve
What does the following code output?
	Throw, Try, Async Promises Async-Await Async/await	JavaScript	Easy	2 mins	Solve
What does the following JS code output?

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We evaluated several of their competitors and found Adaface to be the most compelling. Great library of questions that are designed to test for fit rather than memorization of algorithms.

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Why you should use Pre-employment Jest Test?

The Jest Test makes use of scenario-based questions to test for on-the-job skills as opposed to theoretical knowledge, ensuring that candidates who do well on this screening test have the relavant skills. The questions are designed to covered following on-the-job aspects:

Proficiency in using Jest for test automation and writing test cases
Expertise in testing methodologies and best practices
In-depth knowledge of JavaScript and its fundamentals
Ability to work with data layers in software development
Experience with statistical layers and their integration into systems
Understanding of initializers and their role in application setup
Skilled in executing and analyzing test results
Familiarity with Mocha backends for running test suites
Proficient in working with computation layers in software systems
Knowledge of utility layers and their impact on system performance

Once the test is sent to a candidate, the candidate receives a link in email to take the test. For each candidate, you will receive a detailed report with skills breakdown and benchmarks to shortlist the top candidates from your pool.

What topics are covered in the Jest Test?

Data Layers: Data Layers in software development refer to the components or frameworks responsible for storing, retrieving, and manipulating data. This skill is measured in the test to assess the candidate's understanding and proficiency in data management and storage techniques.

Statistical Layers: Statistical Layers involve the use of statistical models and algorithms to analyze data and extract meaningful insights. This skill is important to measure as it assesses the candidate's ability to apply statistical techniques in data analysis and decision-making.

Initializers: Initializers in software development are functions or code blocks that are executed to initialize the state or setup of a program or application. This skill is measured to evaluate the candidate's understanding of initialization processes to ensure correct program initialization and setup.

Test Execution: Test Execution refers to the process of running and validating test cases against software or systems. Measuring this skill helps assess the candidate's ability to effectively execute tests, identify and report bugs, and ensure the quality and reliability of the software.

Mocha Backends: Mocha Backends are testing frameworks used in JavaScript for writing and executing test cases. This skill is measured to evaluate the candidate's knowledge of Mocha and their proficiency in setting up test environments and writing test cases using Mocha in JavaScript.

Computation Layer: The Computation Layer refers to the components or modules responsible for performing complex computations or calculations in software systems. This skill is important to measure as it assesses the candidate's ability to design and implement efficient algorithms and perform high-performance computations.

Utility Layers: Utility Layers in software development are modules or components that provide common functionalities or tools to support the main functionality of an application. This skill is measured to evaluate the candidate's understanding and experience in creating and using utility modules to enhance the functionality and maintainability of software systems.

CPU Backend with Native Extension: CPU Backend with Native Extension refers to the integration of CPU-centric processing capabilities and native extensions in software systems. This skill is measured to assess the candidate's expertise in optimizing code performance by utilizing CPU-specific optimizations and incorporating native extensions for increased efficiency and speed.

Full list of covered topics

The actual topics of the questions in the final test will depend on your job description and requirements. However, here's a list of topics you can expect the questions for Jest Test to be based on.

Jest Basics

Jest Matchers

Jest Mocking

Jest Configuration

Unit Testing

Integration Testing

Data Manipulation

Data Validation

Data Storing

Data Retrieval

Statistical Analysis

Statistical Modeling

Statistical Visualization

Computation Concepts

Computation Algorithms

Computation Optimization

Initializer Implementation

Initializer Configuration

Test Execution Lifecycle

Test Result Analysis

Mocha Configuration

Mocha Test Suites

Mocha Hooks

Utility Functions

Utility Libraries

CPU Backend Usage

Native Extension Integration

Async Testing

Edge Case Testing

Test Coverage Analysis

Code Performance Measurement

Error Handling

Test Debugging

Test Reporting

Testing Principles

Testing Methodologies

Testing Documentation

Continuous Integration

Test Automation

Code Refactoring

Code Reviewing

Coding Best Practices

Test-driven Development

Behavior-driven Development

Code Quality Assessment

Security Testing

UI Testing

API Testing

Functional Testing

Regression Testing

Exploratory Testing

Performance Testing

Load Testing

Accessibility Testing

Cross-browser Testing

Cross-platform Testing

Mobile Testing

What roles can I use the Jest Test for?

Node.js Software Engineer
Front-End Developer

How is the Jest Test customized for senior candidates?

For intermediate/ experienced candidates, we customize the assessment questions to include advanced topics and increase the difficulty level of the questions. This might include adding questions on topics like

Expertise in CPU backends with native extensions
Solid understanding of software architecture and design patterns
Ability to write efficient and maintainable code
Experience with version control systems like Git
Knowledge of continuous integration and continuous delivery processes
Familiarity with debugging techniques and tools
Understanding of software testing frameworks and libraries
Ability to write clear and concise technical documentation
Strong problem-solving and analytical skills
Effective communication and collaboration skills
Adaptability to new technologies and frameworks

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Non-googleable Questions

Web Proctoring

IP Proctoring

Webcam Proctoring

MCQ Questions

Coding Questions

Typing Questions

Personality Questions

Custom Questions

Ready-to-use Tests

Custom Tests

Custom Branding

Bulk Invites

Public Links

ATS Integrations

Multiple Question Sets

Custom API integrations

Role-based Access

Priority Support

GDPR Compliance

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Have questions about the Jest Hiring Test?

What is Jest Test - jest-skills-test?

The Jest Test assesses candidates' skills in Jest, a JavaScript testing framework. It is used by recruiters to evaluate knowledge in Jest, testing methodologies, and JavaScript. This test helps in identifying skilled professionals for software testing roles.

Can I combine Jest test with JavaScript questions?

Yes, recruiters can request a custom test with multiple skills. For more details on how we assess JavaScript skills, check our JavaScript Online Test.

What kind of questions are used to evaluate senior candidates in the Jest Test?

The Jest Test includes multiple-choice questions and coding questions covering skills such as Test Execution, Mocha Backends, Utility Layers, and CPU Backend with Native Extensions. It assesses both foundational knowledge and advanced skills relevant to senior roles.

How to use Jest Test - jest-skills-test in my hiring process?

Use this test as a pre-screening tool early in your recruitment process. Add a link to the assessment in your job post or invite candidates by email. Adaface streamlines the screening process to identify skilled candidates faster.

Can I test Jest and Mocha together in a test?

Yes, you can test both Jest and Mocha together. This helps in evaluating the candidate's proficiency in different JavaScript testing frameworks. Check our Mocha Online Test for more details.

What are the main JavaScript testing framework tests?

Some of the main JavaScript testing framework tests include:

Can I combine multiple skills into one custom assessment?

Yes, absolutely. Custom assessments are set up based on your job description, and will include questions on all must-have skills you specify. Here's a quick guide on how you can request a custom test.

Do you have any anti-cheating or proctoring features in place?

We have the following anti-cheating features in place:

Non-googleable questions
IP proctoring
Screen proctoring
Web proctoring
Webcam proctoring
Plagiarism detection
Secure browser
Copy paste protection

Read more about the proctoring features.

How do I interpret test scores?

The primary thing to keep in mind is that an assessment is an elimination tool, not a selection tool. A skills assessment is optimized to help you eliminate candidates who are not technically qualified for the role, it is not optimized to help you find the best candidate for the role. So the ideal way to use an assessment is to decide a threshold score (typically 55%, we help you benchmark) and invite all candidates who score above the threshold for the next rounds of interview.

What experience level can I use this test for?

Each Adaface assessment is customized to your job description/ ideal candidate persona (our subject matter experts will pick the right questions for your assessment from our library of 10000+ questions). This assessment can be customized for any experience level.

Does every candidate get the same questions?

Yes, it makes it much easier for you to compare candidates. Options for MCQ questions and the order of questions are randomized. We have anti-cheating/ proctoring features in place. In our enterprise plan, we also have the option to create multiple versions of the same assessment with questions of similar difficulty levels.

I'm a candidate. Can I try a practice test?

No. Unfortunately, we do not support practice tests at the moment. However, you can use our sample questions for practice.

What is the cost of using this test?

You can check out our pricing plans.

Can I get a free trial?

Yes, you can sign up for free and preview this test.

I just moved to a paid plan. How can I request a custom assessment?

Here is a quick guide on how to request a custom assessment on Adaface.

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Along with scorecards that report the performance of the candidate in detail, you also receive a comparative analysis against the company average and industry standards.

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