Jasmine JavaScript Testing Framework Jasmine JavaScript Knowledge 2

Question 1

Which Jasmine method is used to create a spy that replaces a real function and tracks calls to it?

Accepted Answer

jasmine.createSpy()

Answer

jasmine.createSpy() creates a bare spy function that tracks calls without wrapping an existing object method.

Question 2

What does the `spyOn` function return in Jasmine?

Accepted Answer

The spy object itself

Answer

spyOn returns the spy object, allowing you to chain matchers like .and.returnValue() or .and.callThrough().

Question 3

Which spy strategy makes the spy delegate to the actual implementation while still tracking calls?

Accepted Answer

.and.callThrough()

Answer

.and.callThrough() causes the spy to invoke the original function and record the call.

Question 4

How do you assert that a spy was called with specific arguments in Jasmine?

Accepted Answer

expect(spy).toHaveBeenCalledWith(args)

Answer

toHaveBeenCalledWith() is the Jasmine matcher that verifies a spy received particular arguments.

Question 5

What does `jasmine.createSpyObj('name', ['method1', 'method2'])` return?

Accepted Answer

An object with spy methods for each listed name

Answer

jasmine.createSpyObj creates a mock object where every listed method name becomes an individual spy.

Jasmine JavaScript Testing Framework Practice Test