Jasmine JavaScript Testing Framework Jasmine Spies and Mocking 2

Question 1

What does .and.throwError('msg') do when configured on a Jasmine spy?

Accepted Answer

Makes the spy throw an Error with that message when called

Answer

throwError('msg') configures the spy to throw a new Error with the given message every time it is invoked.

Question 2

How do you reset all recorded call data for a Jasmine spy?

Accepted Answer

spy.calls.reset()

Answer

spy.calls.reset() clears the internal call log so count, args, and other tracking data start fresh.

Question 3

What does spy.calls.any() return?

Accepted Answer

true if the spy was called at least once

Answer

any() is a convenience method that returns true when the spy's call count is greater than zero.

Question 4

Which spy configuration method executes a custom function when the spy is called?

Accepted Answer

.and.callFake(fn)

Answer

callFake(fn) replaces the spy's implementation with the provided function, which runs on each invocation.

Question 5

What does jasmine.createSpy('myMethod') create?

Accepted Answer

A standalone spy function not attached to any object

Answer

createSpy produces an independent spy function you can pass as a callback or stub without needing a host object.

Jasmine JavaScript Testing Framework Practice Test