Free Jasmine JavaScript Knowledge Questions and Answers

Question 1

How does Jasmine test exceptions?

Accepted Answer

Use the `toThrowError()` matcher.

Answer

Jasmine provides the `toThrowError()` matcher to test if a function throws an expected error. This matcher is used within an `expect()` block, wrapping the function call that is expected to throw, and can optionally check for a specific error type or message.

Question 2

Which Jasmine function is employed in a test specification to simulate asynchronous operations?

Accepted Answer

`done()`

Answer

The `done()` function is a crucial part of Jasmine's asynchronous testing capabilities. When a test function accepts `done` as an argument, Jasmine waits for `done()` to be called before concluding the test, ensuring that asynchronous operations like callbacks or promises have completed their execution.

Question 3

Which Jasmine function is used to specify a test suite?

Accepted Answer

`describe()`

Answer

In Jasmine, the `describe()` function is used to define a test suite, which is a collection of related test specifications. It takes a string description and a function containing the test specs, organizing tests into logical groups for better readability and structure.

Question 4

Which Jasmine function is used to specify a test specification?

Accepted Answer

`it()`

Answer

The `it()` function in Jasmine is used to define an individual test specification, often referred to as a 'spec'. Each `it()` block contains the actual test code and assertions, describing a specific behavior or outcome that the code under test should exhibit.

Question 5

What does Jasmine's "beforeEach()" function do?

Accepted Answer

Runs code before each test spec within a suite

Answer

Jasmine's `beforeEach()` function is a setup hook that runs a specified block of code before each individual test specification (`it()` block) within its parent `describe()` suite. This is useful for initializing common test data or setting up the environment consistently for every test.

Jasmine JavaScript Testing Framework Practice Test

Jasmine JavaScript Testing Framework Practice Test

Free Jasmine JavaScript Knowledge Questions and Answers