Jest Setup and Teardown

The video tutorial covers the use of Jest lifecycle methods to manage test environments, focusing on beforeEach and afterEach functions. It explains how to handle asynchronous code in Jest and demonstrates setting up test data for consistent test results. The tutorial includes testing login functionality and a challenge to test login failures, emphasizing the importance of a clean test environment.

What is the primary purpose of using Jest lifecycle methods?

• To reduce code complexity

• To improve code readability

• To ensure consistent test environments

• To speed up test execution

Which Jest method is used to run a function before each test case?

• beforeAll

• afterEach

• afterAll

• beforeEach

What is the purpose of the afterEach method in Jest?

• To log test results

• To run a function after each test case

• To run a function after all test cases

• To initialize test data

Why is it important to clear the database before running tests?

• To improve test speed

• To avoid data redundancy

• To ensure tests run with a clean slate

• To reduce memory usage

What does the deleteMany method do in the context of Jest tests?

• Deletes the database

• Deletes a single user

• Deletes all users matching a criteria

• Deletes all users without criteria

Why is it beneficial to create test data in beforeEach?

• To improve test readability

• To ensure tests have specific data to work with

• To speed up test execution

• To reduce code complexity

What is the advantage of setting up test data before running multiple test cases?

• It simplifies the test code

• It reduces the number of test cases

• It ensures all tests have consistent data

• It speeds up the test suite

What status code is expected when a login attempt is successful?

• 404

• 500

• 200

• 400

What should be tested when login credentials are incorrect?

• The user is redirected to the homepage

• A 200 status code is returned

• A 400 status code is returned

• The user is logged in successfully

Why is it not ideal to create a user within each test case?

• It makes the code harder to read

• It increases test execution time

• It complicates the test setup

• It leads to inconsistent test environments