Jasmine JavaScript Testing Framework Jasmine Spies and Mocking

Question 1

What function creates a spy on an existing object method in Jasmine?

Accepted Answer

spyOn(obj, 'method')

Answer

createSpy(obj, 'method')

Answer

mockMethod(obj, 'method')

Answer

interceptMethod(obj, 'method')

Question 2

Which property returns the number of times a Jasmine spy was called?

Accepted Answer

spy.calls.count()

Answer

spy.callCount

Answer

spy.times()

Answer

spy.invocationCount

Question 3

What does spyOn(obj, 'method').and.returnValue(42) do?

Accepted Answer

Makes the spy return 42 instead of calling the real method

Answer

Calls the real method and then returns 42

Answer

Throws 42 as an error value

Answer

Logs 42 each time the method is called

Question 4

How do you configure a Jasmine spy to invoke the original implementation?

Accepted Answer

.and.callThrough()

Answer

.and.passThrough()

Answer

.and.original()

Answer

.and.delegate()

Question 5

What does jasmine.createSpyObj('MyClass', ['save', 'load']) return?

Accepted Answer

A plain object with save and load as spy functions

Answer

A single spy wrapping MyClass

Answer

An array of two spy functions

Answer

A spy attached to the global window object

Question 6

Which expression retrieves the arguments from the most recent spy call?

Accepted Answer

spy.calls.mostRecent().args

Answer

spy.lastArgs

Answer

spy.calls.last().arguments

Answer

spy.recentCall.args