Jasmine JavaScript Testing Framework Jasmine JavaScript 2

Question 1

Which Jasmine spy method tracks calls but also delegates to the real implementation?

Accepted Answer

and.callThrough()

Answer

`and.callThrough()` allows the spy to record calls while still invoking the original function.

Question 2

What does `jasmine.objectContaining()` do in a matcher?

Accepted Answer

Checks that an object has at least the specified key-value pairs

Answer

`jasmine.objectContaining()` passes when the actual object includes all the listed properties, ignoring extras.

Question 3

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

Accepted Answer

expect(spy).toHaveBeenCalledWith(args)

Answer

`toHaveBeenCalledWith()` checks that the spy was called at least once with exactly those arguments.

Question 4

What is the purpose of `beforeAll` in Jasmine?

Accepted Answer

Runs setup code once before all specs in a describe block

Answer

`beforeAll` executes a single time before any `it` blocks in its enclosing `describe` run.

Question 5

Which matcher would you use to confirm a value is `undefined`?

Accepted Answer

toBeUndefined()

Answer

`toBeUndefined()` specifically checks that the value is strictly `undefined`.

Jasmine JavaScript Testing Framework Practice Test