Web Development Testing 2

Question 1

Which testing technique checks boundary values at the edges of input ranges?

Accepted Answer

Boundary value analysis

Answer

Boundary value analysis tests values at the minimum, maximum, and just inside/outside the boundaries of valid input ranges.

Question 2

In Jest, what does the `beforeEach` hook do?

Accepted Answer

Runs before each individual test in a describe block

Answer

`beforeEach` executes a setup function before every individual test (`it`/`test`) within its scope.

Question 3

What is a test double that records calls and allows assertions on how it was used?

Accepted Answer

Spy

Answer

A spy wraps a real function and records information about its calls (arguments, return values, call count) for later assertions.

Question 4

Which HTTP status code range should a REST API return when a client sends an invalid request that fails validation?

Accepted Answer

4xx

Answer

4xx status codes indicate client-side errors; 400 Bad Request or 422 Unprocessable Entity are typical for validation failures.

Question 5

What does `screen.getByRole('button', { name: /submit/i })` test in React Testing Library?

Accepted Answer

That a button is accessible with the text 'submit' using ARIA roles

Answer

React Testing Library's `getByRole` queries the DOM using ARIA roles and accessible names, promoting accessibility-first testing.

Web Development Practice Test