Web Development Testing 4

Question 1

Which assertion library method in Chai verifies that a value is strictly equal using `===`?

Accepted Answer

.equal()

Answer

Chai's `.equal()` uses strict equality (`===`), while `.eql()` performs a deep equality check for objects and arrays.

Question 2

What is the primary goal of mutation testing?

Accepted Answer

To measure how well your tests detect deliberate bugs introduced into the code

Answer

Mutation testing tools (like Stryker) introduce small code changes (mutations) and check if your tests catch them, revealing gaps in test quality.

Question 3

In end-to-end testing, what is a 'Page Object Model' (POM)?

Accepted Answer

A design pattern that encapsulates page interactions into reusable classes

Answer

The Page Object Model abstracts UI interactions into dedicated classes, reducing code duplication and making tests easier to maintain.

Question 4

What does `act()` in React Testing Library help with?

Accepted Answer

Ensuring all state updates and effects are applied before making assertions

Answer

`act()` wraps code that triggers React state updates, ensuring the component re-renders and effects complete before assertions are evaluated.

Question 5

Which HTTP method should an API endpoint test use to verify idempotent resource deletion?

Accepted Answer

DELETE

Answer

DELETE is the idempotent method for removing resources; calling it multiple times should result in the same state (resource gone).

Web Development Practice Test