React JS Masterclass - Go From Zero To Job Ready - Testing Structure / 151

The video tutorial covers the basics of setting up and writing tests using Jest. It explains how to handle failed tests, the importance of removing empty files, and the process of writing a test with a name and callback function. The tutorial delves into querying elements using various methods like test ID and placeholder text, and discusses testing conditions using expect statements. Advanced querying techniques and the use of expectations and assertions are also covered, providing a comprehensive guide to testing in a React environment.

Why is it important to remove empty test files in Jest?

• They are not supported by Jest.

• They cause syntax errors.

• They lead to failed tests.

• They slow down the test execution.

What are the three main steps in a Jest test?

• Compile, Test, Deploy

• Setup, Run, Teardown

• Initialize, Execute, Validate

• Render, Query, Condition

Which method is used to select an element by its test ID in Jest?

• getByLabelText

• getByTestId

• getByText

• getByRole

Which method would you use to find an element by its placeholder text?

• getByRole

• getByLabelText

• getByAltText

• getByPlaceholderText

What does the getBy method return if the element is not found?

• an empty array

• an error

• undefined

• null

Which query method in Jest returns a promise?

• getBy

• queryBy

• allBy

• findBy

What is the purpose of using getAllBy in Jest?

• To select elements by role

• To select elements by text

• To select multiple elements

• To select a single element

How can you check if an element exists in the document using Jest?

• toBePresent

• toBeDisplayed

• toBeVisible

• toBeInTheDocument

What does the expect statement in Jest do?

• It initializes the test environment.

• It defines the test structure.

• It logs the test results.

• It validates the test outcome.

Which of the following is a valid condition to check in Jest?

• All of the above

• toBeUndefined

• toBeFalsy

• toBeNull